enable auto ip address assignment

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What is IPv4 Autoconfiguration and why it overwrites static IP

I have to connect to a router with a static IP and subnet (machine automation, not internet). In ipconfig, subnet mask shows the subnet address I inputed but the IP is assigned a different one from the address I inputted. The previous computer connects properly and the only difference I notice in ipconfig is the new computer has "Autoconfiguration IPv4".

What is IPv4 Autoconfiguration? IP should be assigned from the router's DHCP, and if there is a IP-MAC conflict I should receive an error message. Why is IPv4 Autoconfiguration appear in PC's command prompt instead of the usual IPv4 in this case?

Googling yield a solution but that require modification of the registry to disable Autoconfiguration. I had already had the latest driver update. I suspect there is an alternative solution.

• wireless-networking

• Please provide a screenshot of the network connection’s IPv4 properties, where you entered your desired IP address etc. –  Daniel B Aug 22, 2017 at 6:09
• Picture uploaded. As you see I set IP to be 100.0.0.255/255.255.0.0 but ipconfig shows Autoconfiguration IPv4 169.254.196.218/255.255.0.0 –  KMC Aug 22, 2017 at 6:55
• It might be that Windows incorrectly assumes that .255 is an incorrect IP, but it is valid with that subnet mask. Did you try any other IP addresses? –  Paul Aug 22, 2017 at 6:59
• Unfortunately I cannot since the device is fixed sending message only to 255. Why would OS autoconfiguration IPv4? Shouldn't that be the job of the router's DHCP? –  KMC Aug 22, 2017 at 7:11
• Just making sure: You’re positive you set up the correct network adapter? –  Daniel B Aug 22, 2017 at 7:19

6 Answers 6

The screenshot shows an IPv4 address that start with 169.254.

This is from the "link local" range (e.g., RFC 3927 page 31 discusses what Windows XP using these addresses). Some people call these addresses "APIPA" addresses, named after Windows XP's process called Automatic Private IP Assignment (APIPA).

It seems that as technology has advanced, there are now two causes that commonly resulting in an address in this range.

• Windows will use this if it is set to use DHCP, and it tries to get an address from a DHCP server, and fails.
• "Duplicate Address Detection" ("DAD") has resulted in noticing an IP address conflict. From the comments that have been made, it seems that the feature of "Duplicate Address Detection" detection may also result in automatically assigning a different IP address, even if an IP address is statically configured.

The potential fixes to having such an address can be:

• check the logs to see if there is anything mentioned about a duplicate IP address. If so, try to determine what other device had that address, and why it did. If it got that address by DHCP, try to determine which DHCP server was used by each address that got that address, and troubleshoot the DHCP server(s). (Note that accidentally having an unknown extra DHCP server might be a common cause for this.)
• get DHCP communication functioning successfully,
• or to go to the NIC properties and specify an "Alternate Configuration" process that uses a specified "User configuration", or to use a static IP address.

Why DHCP isn't working is a separate question. This is the correct answer for specifically what you asked, which is: "What is IPv4 Autoconfiguration".

As for why DCHP overwrites static IP: DHCP usually doesn't. If you see an Autoconfiguration address in Microsoft Windows, then you're not using a "static IP" assignment. (Instead, you're configured to be trying to use DHCP, or DAD is taking effect.)

According to one comment (which was made via a proposed suggested edit), newer versions of Microsoft Windows may silently set an autoconfig IP (instead of showing a message on the screen). This is likely caused by DAD.

Trying to disable DAD might not be a great way to fix the problem, as that may cause the computer to start working on the desired IP address, but not address the issue that another device is trying to use the same IP address (which may cause problems immediately, or later when the other device starts being more active again).

• It's worth noting that in the time since this answer was written, RFC 3927 has been rejected . –  Brett Holman Jun 6, 2022 at 14:11
• 3 @BrettHolman I don't see that being the case. Having reviewed this (because I understand an RFC may be deprecated/obsoleted, but never heard of an RFC being "rejected"), I've determined that Errata ID 6293 has been rejected. Errata ID 6293 seems to be a proposed complaint/correction/update about RFC 3927, and this Errata was probably rejected due to a procedural concern: the rejector seems to indicate that if that text is going to be properly updated than that should happen by drafting a new RFC, not making an Errata on the old RFC. (So the RFC itself was never "rejected" that I can see.) –  TOOGAM Jun 15, 2022 at 18:43
• Thank you for the clarification, I mistook the attached Errata rejection for rejection of the RFC. I really appreciate the response :) –  Brett Holman Jun 16, 2022 at 14:38

As the alternative to editing registry you can try this solution:

• open command line
• check id of network connection - it will be in the 1st column: netsh interface ipv4 show inter
• run this command replacing <id> with id of your network connection: netsh interface ipv4 set interface <id> dadtransmits=0 store=persistent
• open services.msc and disable dhcp client
• disconnect network cable, restart computer, start dhcp client service and plug in network cable

source: http://the-it-wonders.blogspot.com/2013/04/autoconfiguration-ipv4-address-196254xx.html

Since I can't add comment to TOOGAM's answer: autoconfiguration apparently can overwrite static ip configuration. Today I had a laptop (with Windows 10, version 1709) that couldn't access network and had both static ip and autoconfiguration ip visible in ipconfig output even though I put static ip in network card configuration.

• Thanks jacob_w. This happened to us today too for no apparent reason, and your fix made it work. We've done many machines the same way and this is the first time we've seen this, so go figure. If anyone works out the actual reason this happens, please post. –  radsdau Jun 12, 2018 at 6:11
• I feel pretty certain that steps 4 and 5 could be replaced by this: run IPConfig /release and then run IPConfig /renew . That may take a while, but would be faster (and easier) than the steps 4 and 5 provided, and would fully accomplish the critical steps that would happen by performing the longer steps 4 and 5 listed here. The basic reason either approach (either version of steps 4 and 5) would work is simply re-attempting a DHCP Discover or DHCP Request communication. –  TOOGAM Dec 15, 2019 at 14:24
• If that works, the typical real problem is unreliability with the DHCP process. That could happen due to bad networking (bad center of cables, loose connection in the connectors of cables, wireless signal interference, filled DHCP scope which may randomly have an available address based on other devices)... maybe too many possible causes to list them all here, but not caused by a bad registry setting. –  TOOGAM Dec 15, 2019 at 14:28

I had the same issue and in my case i had a static IP

So the Comment by another person "As for why it overwrites static IP: It doesn't. -- Is Incorrect

In my scenario it was one of the VMs and there was another VM with the same IP. Instead of throwing the error about duplicate IP in my case it performed Auto Configuration

• 1 this was my issue. i'm working with a printer that has a static ip of 192.168.123.100. I connected this printer to my laptop through ethernet, and also set the NIC ip to be 192.168.123.100, but because it conflicted with the printer's ip, the NIC defaulted back to 169.254. –  Simon Sep 12, 2019 at 18:22
• On professionally-run networks I've encountered, we didn't typically have encounter duplicate addresses, so "duplicate address detection" wasn't actively affecting things. The " Obtain an IP address automatically " option basically boiled down to attempting DHCP, and if that failed, using the Alternate Configuration tab (which was usually unconfigured, resulting in APIPA assigning an IPv4 (169.254.*) link-local address. The " Use the following address " option resulted in a static IP, not causing DHCP or Link-Local to work. –  TOOGAM Dec 15, 2019 at 14:41
• I suspect that if Duplicate Address Detection (DAD) is being particularly useful, that may be because of some sort of issue with DHCP (e.g., server doesn't exist on the LAN being used, which may be quite likely with some "virtual machine" setups... or a filled DHCP scope, which may be remedied with an increased scope size or figuring out what is using up the addresses in an existing scope). My inclination would be to figure out why DHCP is not being a working, reliable solution, and trying to address that as a problem. (Of course, that works for me, who knows how to set up/troubleshoot DHCP) –  TOOGAM Dec 15, 2019 at 14:44
• 1 Question is about static IP –  SeanClt Dec 15, 2019 at 15:21

I had the same issue. I read that this is because the NIC card is not working properly, even though the Ethernet card said it was working properly. I have an HP desktop computer. I went to HP support, downloaded and reinstalled the Realtek Ethernet Controller Drivers for it and it fixed the card problem. No more autoconfiguration ipv4 address. Hope this help others.

• 2 You say "No more autoconfiguration ipv4 address." But that's wrong, based on the output you quote, as the output says " Autoconfiguration Enabled . . . . : Yes ". What is true is that you didn't get an Autoconfiguration address from the "Link-local" (IPv4 169.254.*) range. Instead, your Autoconfiguration successfully got an address from the DHCP server, which is identified in your output on the line that says " DHCP Server . . . . . . . . . . . : 172.16.0.1 ". So whatever device is at 172.16.0.1 (which is also your Default Gateway, so is some type of router) served you well, with DHCP. –  TOOGAM Dec 15, 2019 at 14:32

Its caused by a conflicting IP address. (Someone else on the same network has the same IP).

Changing the static IP helped me, but i am aware its not always practical. For me it worked because i connect to this computer alone.

• 1 Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center . –  Community Bot May 4, 2023 at 12:06

I had the same issue.

I had a hyper-v instance with several network adapters, all set with static IP addresses.

One instance was set up with 8 network adapters, all static IP. One adapter would have an auto configured ipv4 169 address, eventhough I set it with a static IP. Very frustrating, and after trying many other things I figured it out. It had been set with a static IP address that was already taken by another device. Simply changing the static IP address fixed the autoconfigured 169 issue.

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IP Addressing: IPv4 Addressing Configuration Guide

Bias-free language.

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

• Read Me First
• Configuring IPv4 Addresses
• IP Overlapping Address Pools
• IP Unnumbered Ethernet Polling Support
• Zero Touch Auto-IP

Chapter: Auto-IP

Finding feature information, prerequisites for auto-ip, restrictions for auto-ip, auto-ip overview, seed device, auto-ip configuration for inserting a device into an auto-ip ring, device removal from an auto-ip ring, conflict resolution using the auto-swap technique, configuring a seed device, configuring the auto-ip functionality on node interfaces (for inclusion in an auto-ip ring), verifying and troubleshooting auto-ip, example: configuring a seed device, example: configuring the auto-ip functionality on node interfaces (for inclusion in an auto-ip ring), additional references for auto-ip, feature information for auto-ip.

• Ethernet interfaces and sub interfaces.
• Virtual routing and forwarding instance (VRF) interfaces.
• Switch Virtual Interfaces (SVIs).
• EtherChannels.

Information About Auto-IP

How to configure auto-ip, configuration examples for auto-ip.

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn . An account on Cisco.com is not required.

• Link Layer Discovery Protocol (LLDP) must be enabled on the device before the auto-IP functionality is enabled on the node interface.

Auto-IP on an EtherChannel

• When you configure auto-IP on an EtherChannel, ensure that LLDP is enabled on the member interfaces of the EtherChannel.
• Auto-IP configuration on an interface must be removed before moving an interface into an EtherChannel.

Auto-IP on VRF interfaces

• If you intend to configure auto-IP on an interface for a specific virtual routing and forwarding instance (VRF), then ensure that the interface is presently within the VRF. If you enable auto-IP on an interface and then associate the interface to a VRF, the auto-IP settings on the interface will be cleared, and you will have to enable the auto-IP feature on the VRF interface again.
• Auto-IP addresses must not contain an even number in the last octet (such as 10.1.1.2, where the number in the last octet is 2).
• Auto-IP configuration on an interface is not retained when the interface is moved from one virtual routing and forwarding instance (VRF) to another, including the global VRF.
• Interface nodes in different VRFs cannot be configured for the same ring. Ensure that the nodes you select belong to the same VRF.
• If a VRF address family is IPv6, you cannot configure auto-IP on the interfaces within the VRF. You can configure auto-IP on a VRF interface if the VRF address family is IPv4.

Auto-IP on SVI interfaces

• Auto-IP configuration is not possible on a Switch Virtual Interface (SVI) with more than one physical interface. The SVI physical interface must be an access port or trunk port with only one associated VLAN or a bridge domain interface (BDI).

Auto-IP on EtherChannel interfaces

• Auto-IP configuration can be done on an EtherChannel interface, but not on a member interface of the EtherChannel.

The auto-IP feature is an enhancement of Link Layer Discovery Protocol (LLDP). LLDP uses a set of attributes to discover neighbor devices. This attribute set is called Type Length Value (TLV) as it contains type, length, and value descriptions.

In a ring topology, two network-to-network interfaces (NNIs or node interfaces) of a device are used to be part of the ring. For a ring to function as an auto-IP ring, you must configure the auto-IP feature on all the node interfaces within the ring. One node interface of a device is designated as the owner-interface and the other interface as the non-owner-interface. In an auto-IP ring, the owner-interface of a device is connected to a non-owner-interface of the neighbor device. A sample topology is given below:

When a new device is inserted into an auto-IP ring, owner and non-owner-interfaces of the inserted device are identified. The node interface of the inserted device that is connected to an owner-interface is designated as the non-owner-interface, and it automatically receives an IP address from the connected neighbor device. The IP address is automatically configured on the interface. Since the non-owner-interface is identified, the other node interface of the inserted device is designated as the owner-interface, and the device assigns a pre configured auto-IP address to its designated owner-interface.

An auto-IP address is a preconfigured address configured on a node interface to make the interface capable of automatically assigning an IP address to a new neighbor interface that is detected in the auto-IP ring. The configured auto-IP address is used for allocation purposes.

You must configure the same auto-IP address on the two node interfaces that are designated to be part of an auto-IP ring, and the auto-IP address must contain an odd number in the last octet. The auto-IP address is assigned to the owner-interface when the device is introduced into an auto-IP ring. Since each auto-IP address contains an odd number in the last octet, the IP address derived by subtracting 1 from the last octet is an even number, and is not used for designating auto-IP addresses. This IP address is allocated to a newly detected neighbor, non-owner-interface.

For example, if we assume that the device R3 is inserted between the devices R1 and R2 in the above topology, and the auto-IP address 10.1.1.3 is configured on e0/1 and e0/0, the two node interfaces on device R3, then R1 assigns an IP address to the non-owner-interface of R3, e0/1. The IP address 10.1.1.3 is assigned to the owner-interface of R3, e0/0. The IP address derived by subtracting 1 from the last octet of the auto-IP address is 10.1.1.2. 10.1.1.2 is assigned to the neighbor non-owner-interface of the connected neighbor device R2.

Auto-IP TLV exchange

Before insertion, the node interfaces are not designated as owner and non-owner. After insertion, the auto-IP TLV is exchanged between the neighbor devices. During this initial negotiation with the adjacent device interfaces, owner and non-owner-interfaces are determined automatically.

After a device is inserted into a ring, the auto-IP address configured for the device (such as 10.1.1.3) is assigned to the owner-interface for the /31 subnet. An owner-interface has a priority 2 in the auto-IP TLV, and a non-owner-interface has priority 0 in the auto-IP TLV. If there is no assigned IP address on the node interface (before the node is inserted into a ring), then the ring interface has priority 1 in the auto-IP TLV.

The IP address negotiation is based on priority; the higher value of priority wins the negotiation. If the priority is equal, then IP negotiation fails. This scenario usually occurs when there is an incorrect configuration or wiring. In such a scenario, you must ensure that the configuration and wiring is proper.

Some points on auto-IP configuration on virtual routing and forwarding instance (VRF) interfaces are noted below:

• Auto-IP configuration on an interface is removed when the interface is moved from one VRF to another, including the global VRF. So, assign the interface to a VRF and then configure the auto-IP feature on the interface.
• You can configure auto-IP on a VRF interface only if the address family of the VRF is IPv4. If the IPv4 address family configuration is removed from a VRF, the auto-IP configuration is removed from all the interfaces within the VRF.
• If a VRF address family is IPv6, you cannot configure auto-IP on the interfaces within the VRF. However, if a VRF address family is IPv4 and IPv6, you can configure auto-IP on the interfaces within the VRF.
• If the IPv6 address family configuration is removed from a VRF with both IPv4 and IPv6 address-family configuration, the auto-IP configuration on the interfaces within the VRF remain intact.
• If a VRF is deleted, then the auto-IP configuration on all the interfaces assigned to the VRF are removed.
• A specific ring has two interface nodes. Ensure that the two nodes you select belong to the same VRF. Nodes in different VRFs cannot be configured for the same ring.
• Within a VRF, the same auto-IP address cannot be used for different ring IDs.

Some points on auto-IP configuration for an EtherChannel interface are noted below:

• You can configure auto-IP on an EtherChannel interface. If you configure the auto-IP feature on an EtherChannel and then add member interfaces to the EtherChannel, then auto-IP TLV information is carried to all the member interfaces. If you add member interfaces to the EtherChannel and then configure auto-IP on the EtherChannel, auto-IP TLV information is carried to all the member interfaces. Attention: LLDP must be enabled on the member interfaces.
• The list of EtherChannel member interfaces are maintained in ring interfaces corresponding to the EtherChannel. Auto-IP information is transmitted on all the EtherChannel member interfaces.
• If you remove a member interface from an EtherChannel, auto-IP TLV information is not carried to the removed interface.

Some points on auto-IP configuration on a Switch Virtual Interface (SVI) are noted below:

• Auto-IP configuration on an SVI is possible only if a single physical interface is associated with an SVI.
• The SVI physical interface must be an access port or trunk port with only one associated VLAN or a bridge domain interface (BDI).
• If the SVI is mapped to more than one physical port, then the auto-IP configuration on the SVI will be removed.

Seed devices are the devices used to initiate network discovery. To initiate auto-IP capability in a ring, at least one device must be configured as a seed device in the ring. To configure a device as a seed device in an auto-IP ring, you must manually configure the IP address configured on one of its node interfaces with the auto-IP address of the interface, with the mask /31 (or 255.255.255.254).

A sample topology is given below. In this scenario, device R1 is being configured as the seed device.

The e0/0 interface on device R1 is configured with the auto-IP address 10.1.1.1 and the e0/1 interface on device R2 is configured with the auto-IP address 10.1.1.3.

To configure R1 as the seed device, 10.1.1.1 must be configured as the IP address of the interface e0/0. By configuring the IP address of e0/0 interface of R1 to its auto-IP address, R1 is configured as the seed device and the interface e0/0 becomes the owner of the subnet.

The process of configuring the device R1 as the seed device is given below:

After a connection is established between the devices R1 and R2, R1 sends a Link Layer Discovery Protocol(LLDP) packet which contains an auto-IP Type Length Value (TLV) with priority 2.

On receiving the auto-IP TLV from R1, R2 derives the IP address for the interface e0/1 (by subtracting 1 from the last octet of R1's auto-IP address), and assigns the IP address 10.1.1.0/31 to R2's e0/1 interface. The interface e0/1 on R2 becomes the non-owner interface on this subnet.

The IP address allocation is displayed in the illustration given below:

The device and node interface details for the subnet are given below:

To insert a device into an existing auto-IP ring, the node interfaces of the device must be configured with the auto-IP address.

The topology in the illustration below shows a sample scenario.

Device R1 is configured as the seed device. Interface e0/0 on R1 is configured with the IP address 10.1.1.1/31, and is the owner of the subnet connecting R1 and R2. Interface e0/1 on device R2 has the IP address 10.1.1.0/31, and is the non-owner interface of the subnet.

Device R3 is inserted between R1 and R2. The two designated node interfaces e0/0 and e0/1 of R3 are configured with the auto-IP address 10.1.1.5. After insertion of the device, the ring topology appears as shown in the illustration below:

R1 sends an auto-IP Type Length Value (TLV) with priority 2 to the e0/0 interface of R3.

After receiving the auto-IP TLV from R1, R3 sends an auto-IP TLV with priority 0 to the e0/0 interface of R1.

R1 wins the election process and the interface e0/0 of R1 is designated as the owner interface on the subnet connecting R1 and R3.

The e0/0 interface on R3 becomes the non-owner interface and the IP address 10.1.1.0 is assigned to it.

The other node interface on R3 is designated as an owner interface and its auto-IP address (10.1.1.5) is assigned as the IP address of the interface.

R3 sends an auto-IP TLV with priority 2 to the e0/1 interface of R2.

After receiving the auto-IP TLV from R3, R2 sends an auto-IP TLV with priority 0 to the e0/1 interface of R3.

R3 wins the election process and its interface e0/1 is designated as the owner interface on the subnet connecting R3 and R2.

The e0/1 interface on R2 is designated as the non-owner interface, and the IP address 10.1.1.4 is assigned to it.

The other node interface on R2 is designated as the owner interface and its auto-IP address is assigned as the IP address.

The IP addresses that are configured for the owner and non-owner interfaces on the devices R1, R2, and R3 are given below:

The topology in the illustration below shows a sample scenario:

In the topology, device R3 is removed from the auto-IP ring and device R1 is connected to R2. As a result, auto-IP Type Length Value (TLVs) are exchanged between R1 and R2. Since the e0/0 interface of R1 sends an auto-IP TLV with priority 2 and the e0/1 interface of R2 sends an auto-IP TLV with priority 0 to the e0/0 interface on R1, the e0/0 interface of R1 is designated as the owner interface on the subnet connecting R1 and R2. R1 assigns the IP address to the e0/1 interface on R2, and it becomes the non-owner interface on this subnet.

After the removal of R3 from the auto-IP ring, the ring topology looks like this:

The IP address of the owner and non-owner interfaces on the subnet are given below:

The auto-swap technique automatically resolves conflicts due to incorrect insertion of a device into an auto-IP ring.

If you remove a device from an auto-IP ring, the owner and non-owner auto-IP configuration on the node interfaces is retained. You can insert the device back into an auto-IP ring.

If you incorrectly insert a device into a ring with its interfaces swapped (due to which two owner interfaces and two non-owner interfaces are connected to each other, rather than a connection between an owner and a non-owner interface), then identical priority values are exchanged between interfaces during the auto-IP Type Length Value (TLV) transmission. This leads to a tie in the priority value that is exchanged between the node interfaces of the inserted device, and a conflict is detected.

The auto-swap technique resolves conflicts on both the node interfaces of the inserted device and allows allocation of IP addresses for the interfaces.

In this topology, device R3 is incorrectly inserted between the devices R1 and R2, with its interfaces swapped. The conflict arises due to incorrect insertion, as given below:

• An owner interface is connected to another owner interface; the e0/0 interface of R1 is connected to the e0/1 interface of R3.
• A non-owner interface is connected to another non-owner interface; the e0/1 interface of R2 is connected to the e0/0 interface of R3.

The auto-IP TLV exchange details between R1 and R3 are given below:

• The e0/0 interface on R1 sends an auto-IP TLV with priority 2 to the e0/1 interface on R3.
• The e0/1 interface on R3 sends an auto-IP TLV with priority 2 to the e0/0 interface on R1.

Since the same priority value of 2 is sent in both instances, there is a tie during the election process, leading to a conflict.

Similarly, the same priority value of 0 is exchanged between the e0/0 interface of R3 and the e0/1 interface of R2 since they are non-owner interfaces, leading to a conflict.

The auto-IP feature uses the auto-swap technique to resolve conflicts on both the node interfaces of the inserted device.

The priority and the interface IP address of the e0/1 interface on R3 is swapped with the priority and the interface IP address of the e0/0 interface on R3, respectively.

After swapping, the following auto-IP TLV information is exchanged between R1 and R3:

• The e0/1 interface on R3 sends an auto-IP TLV with priority 0 to the e0/0 interface on R1.

Since the priority sent by R1 to R3 is higher than the priority sent by the interface e0/1 on R3, R3 derives the IP address 10.1.1.0 for the e0/1 interface from the auto-IP address of R1 (10.1.1.1).

The following auto-IP TLV information is exchanged between R3 and R2:

• The e0/0 interface on R3 sends an auto-IP TLV with priority 2 to the e0/1 interface on R2.
• The e0/1 interface on R2 sends an auto-IP TLV with priority 0 to the e0/1 interface on R3.

R2 detects the priority sent by R3 to be higher than the priority sent by its interface e0/1 and derives the IP address 10.1.1.4 from the auto-IP address of R3 (10.1.1.5).

After conflict resolution, the topology looks like this:

The e0/1 interface on R3 is designated as a non-owner interface and the e0/0 interface on R3 is designated as the owner interface.

You must configure at least one seed device in an auto-IP ring. To configure a seed device, you must configure the auto-IP address on the two node interfaces of the device (for a specific ring), and use the same IP address to configure the IP address on one of the two node interfaces.

Understand these concepts before configuring auto-IP on virtual routing and forwarding instance (VRF) interfaces, Switch Virtual Interfaces (SVIs), and EtherChannels:

• VRF—If you intend to enable auto-IP on a VRF interface, ensure that the node interface is presently within the VRF. If the interface is not within a VRF presently, assign the interface to the VRF and then configure auto-IP on the VRF interface. Ensure that both node interfaces for the ring are assigned to the same VRF.
• SVI—Auto-IP configuration on an SVI is possible only if a single physical interface is associated with an SVI and the physical interface is an access port.
• EtherChannels—You can configure auto-IP on an EtherChannel interface, but not on a member interface of the EtherChannel.

1.     enable

2.     configure terminal

3.     lldp run

4.     interface type number

5.     auto-ip-ring ring-id ipv4-address auto-ip-address

6.     exit

7.     interface type number

8.     auto-ip-ring ring-id ipv4-address auto-ip-address

9.     ip address interface-ip-address subnet-mask

10.     end

11.     show auto-ip-ring [ ring-id ][ detail ]

Returns to privileged EXEC mode.

Displays auto-IP information.

To insert a device into an auto-IP ring or to enable node interfaces in an existing ring, you must configure the auto-IP address on the 2 designated node interfaces of the device.

• VRF—If you intend to enable auto-IP on a VRF interface, ensure that the node interface is presently within the VRF. If the interface is not within a VRF presently and you want the interface to be within a VRF, move the interface within the VRF and then configure auto-IP on the VRF interface. Ensure that both node interfaces are within the same VRF.

This task is applicable for a non-seed device in an auto-IP ring. Ensure that a seed device is configured for the auto-IP ring before performing this task.

Perform the steps given below to configure the auto-IP functionality on the two node interfaces of a device:

10.     show auto-ip-ring [ ring-id ][ detail ]

Perform this task to verify auto-IP functions.

2.     show auto-ip-ring [ ring-id ][ detail ]

3.     show auto-ip-ring [ ring-id ][ detail ]

4.     debug auto-ip-ring { ring-id { errors | events } | errors | events }

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Posted on Sep 13, 2021

AWS Subnet Tip: Using the Auto-Assign Attribute

Have you ever launched an EC2 instance into a subnet only to discover your instance doesn't have a public IPv4 address? Your subnet configuration may be the reason for this issue. In this quick tip, I will explain why this happens and show you how to control this behavior.

When launching an EC2 instance from the AWS portal, you need to specify how a public IP address gets assigned to the instance. There are a few options, but the one I want to focus on here allows AWS to auto-assign an IPv4 address. This option pulls an IP address from Amazon's public IP address pool and assigns it to your instance.

The auto-assign option is set via the launch wizard's auto-assign Public IP setting, as shown in the image below. There are three values to choose from, "Use subnet setting", "enable", or "disable".

The "enable" and "disable" values do exactly what you would expect; enable or disable the auto-assign functionality. Disabling the auto-assign property is useful when the EC2 instance shouldn't be publicly available or maybe you will assign an Elastic IP (EIP) address to the instance. Choosing the "Use subnet setting" can lead to an instance that isn't available publicly over the Internet.

It's All About the Subnet

Notice in the image below that subnets have a property named Enable auto-assign public IPv4 address . This property configures the subnet's auto-assign behavior.

An instance launched with the "Use subnet setting" value instructs AWS to apply the IP address assignment behavior as configured at the subnet level.

Subnet Behavior

Subnets created by AWS are called default subnets. These subnets have their auto-assign property set to true by default. Subnets you create, called non-default subnets, set the property's value to false by default. The one exception to this rule is a subnet created by the Instance Launch Wizard. The wizard sets the auto-assign property to true .

If you select the default subnet at the time of instance creation and choose the "Use subnet setting" option, the instance will have a public IPv4 address assigned. However, if you choose a non-default subnet, that instance may not get a public IP address. It all depends on how you configured your subnet to use the auto-assign functionality.

AWS provides an API to modify the subnet's auto-assign property. You can use the AWS CLI to enable or disable the property.

To enable auto-assign:

To disable auto-assign:

Changing the value does not affect existing instances. It only applies to future instances created within the subnet. The AWS portal can be used to modify this setting as well.

In this quick tip I wanted to point out the behavior of the auto-assign property, both at the instance, and more so at the subnet level. Not enabling the auto-assign option at the subnet level may lead to the creation of an EC2 instance that doesn't have a public IP address, forcing you to recreate the instance after you've modified the subnet properties.

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• Joined Mar 3, 2018

Thank you for this posting. I'm learning AWS and I was stuck on this issue. Now I got the logic and can easily handle this situation.

I fixed my group by changing the public subnet attribute :)

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How to change from static to dynamic IP address on Windows 10

Are you using a static IP address? Here are four ways to switch to a dynamic configuration on Windows 10.

On Windows 10, you can configure a network adapter to use a static IP address manually, or you can use an automatically assigned configuration using the local Dynamic Host Configuration Protocol (DHCP) server.

Although using a static IP address is recommended for devices that provide services to network users, as its configuration never changes, it may come a time when you may no longer need this configuration, and a dynamically assigned network configuration will be more suited.

If you use a static IP address and need to switch to a dynamic configuration, it’s possible to perform this task in several ways, including using the Settings app, Control Panel, Command Prompt, and even PowerShell.

In this guide , you’ll learn the steps to remove a static IP address configuration to obtain a dynamic configuration from the DHCP server on Windows 10 .

Change to dynamic IP address (DHCP) from Settings

Change to dynamic ip address (dhcp) from command prompt, change to dynamic ip address (dhcp) from powershell, change to dynamic ip address (dhcp) from control panel.

To enable DHCP to obtain a TCP/IP configuration automatically on Windows 10, use these steps:

Open Settings on Windows 10.

Click on Network & Internet .

Click on Ethernet or Wi-Fi .

Click the network connection.

Under the “IP settings” section, click the Edit button.

Use the Edit IP settings drop-down menu and select the Automatic (DHCP) option.

Click the Save button.

Once you complete the steps, the networking stack configuration will reset, and your device will request an IP address from the DHCP server (usually your router).

To switch from a static TCP/IP configuration to a dynamically assigned configuration using DHCP with Command Prompt, use these steps:

Open Start .

Search for Command Prompt , right-click the top result, and select the Run as administrator option.

Type the following command to note the name of the network adapter and press Enter

Type the following command to configure the network adapter to obtain its TCP/IP configuration using DHCP and press Enter :

In the command, make sure to change “Ethernet1” for the adapter’s name that you want to configure.

After completing the steps, the network adapter will stop using a static IP address, and it’ll obtain a configuration automatically from the DHCP server.

To remove a static IP and DNS addresses to use a dynamic configuration using PowerShell, use these steps:

Search for PowerShell , right-click the top result, and select the Run as administrator option.

Type the following command to note the “InterfaceIndex” number for the network adapter and press Enter :

Type the following command to enable the network adapter to obtain its TCP/IP configuration using DHCP and press Enter :

In the command, make sure to change “Ethernet0” for the adapter’s name that you want to configure.

Type the following command to enable the network adapter to obtain its DNS configuration using DHCP and press Enter :

In the command, change “3” for the InterfaceIndex for the adapter to configure.

Once you complete the steps, the IP and DNS addresses will be reset from the adapter, and your computer will receive a new dynamic configuration from DHCP.

To configure a network adapter to use a dynamic IP address using Control Panel, use these steps:

Open Control Panel .

Click on Network and Internet .

Click on Network and Sharing Center .

On the left pane, click the “Change adapter settings” option.

Right-click the network adapter and select the  Properties option.

Select the “Internet Protocol Version 4 (TCP/IPv4)” option.

Click the Properties button.

Select the “Obtain an IP address automatically” option.

Select the “Obtain the following DNS server address automatically” option.

Click the OK button.

After completing the steps, the statically assigned TCP/IP configuration will no longer be available, and the computer will automatically request a dynamic network configuration from the network.

Mauro Huculak is a Windows How-To Expert who started Pureinfotech in 2010 as an independent online publication. He has also been a Windows Central contributor for nearly a decade. Mauro has over 14 years of experience writing comprehensive guides and creating professional videos about Windows and software, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 20 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter) , YouTube , LinkedIn and About.me . Email him at [email protected] .

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November 8, 2023

Mastering autoconfiguration ipv4 address simplified.

In today’s fast-paced and interconnected world, the importance of understanding IPv4 address autoconfiguration cannot be overstated. Whether you are an IT professional, a network administrator, or just a curious tech enthusiast, delving into the intricacies of IPv4 address assignment is a valuable pursuit. 

In this comprehensive guide, we will explore the intricacies of IPv4 address autoconfiguration , providing you with the knowledge you need to master this critical aspect of networking.

The Significance of IPv4 Address Autoconfiguration

IPv4, or Internet Protocol version 4, has been the backbone of the Internet for decades. Every device connected to the Internet requires a unique IP address to communicate effectively. 

In the early days of networking, these addresses were assigned manually, a cumbersome and error-prone process. This led to the development of autoconfiguration methods, which simplified the assignment of IP addresses.

IPv4 address autoconfiguration plays a vital role in simplifying the setup of networks, ensuring that devices can communicate seamlessly without human intervention. It eliminates the need for manual configuration and significantly reduces the risk of errors that can disrupt network functionality.

DHCP and IPv4 Autoconfiguration

Dynamic Host Configuration Protocol (DHCP) is one of the most widely used methods for IPv4 address autoconfiguration. DHCP servers on a network automatically assign IP addresses to devices when they join the network. This process eliminates the need for manual configuration, making it a preferred choice in most scenarios.

However, there are situations where DHCP may not be available, or you may prefer a more straightforward approach to autoconfiguration. This is where IPv4 link-local addressing comes into play.

IPv4 Link-Local Addressing

IPv4 link-local addressing is a simplified autoconfiguration method that allows devices to assign themselves an IP address when no DHCP server is available. This approach is particularly useful in scenarios like small, isolated networks, or when you need a quick and temporary connection.

When a device uses link-local addressing, it assigns itself an IP address from a specific range (169.254.0.0 to 169.254.255.255). This self-assigned address allows the device to communicate with others on the same network segment, even if no DHCP server is present. While it may not be suitable for all situations, link-local addressing provides a straightforward and reliable method for automatic IP assignment.

How to Implement IPv4 Link-Local Addressing

Implementing IPv4 link-local addressing is a straightforward process, and it can be achieved in just a few simple steps:

Check Network Connectivity: Ensure that your device is connected to the network segment you want to configure. Link-local addressing is limited to communication within the same network segment.

Enable IPv4 Link-Local: Most modern operating systems enable link-local addressing by default. However, it’s essential to verify that it’s enabled in your network settings.

Verify Address Assignment: After enabling link-local addressing, your device will automatically assign itself an IP address from the 169.254.0.0 to 169.254.255.255 range. You can check your device’s IP address to confirm the assignment.

Test Communication: With the link-local address in place, you can now communicate with other devices on the same network segment. This can be valuable for troubleshooting or establishing temporary connections.

Common Scenarios for IPv4 Link-Local Addressing

IPv4 link-local addressing is a versatile tool that can be used in various scenarios, including:

Network Troubleshooting: When you encounter network issues, using link-local addressing can help you quickly test connectivity and isolate problems.

Ad Hoc Networks: In situations where you need to set up a temporary network between devices, such as in a meeting room or at an event, link-local addressing simplifies the process.

Limited DHCP Resources: In environments with limited DHCP resources or where DHCP servers are not available, link-local addressing ensures devices can still communicate effectively.

Zero-Configuration Networks: Link-local addressing is a fundamental component of zero-configuration networking protocols, like Bonjour in Apple products. It enables devices to discover and communicate with each other without manual configuration.

IPv4 Address Autoconfiguration Best Practices

To make the most of IPv4 address autoconfiguration, consider the following best practices:

Maintain Network Segmentation: Ensure that devices using link-local addressing are within the same network segment. Link-local addresses are not routable outside of their local network.

Combine DHCP and Link-Local: In some network setups, it’s beneficial to have a combination of DHCP and link-local addressing. This provides flexibility and redundancy in IP address assignment.

Regularly Monitor Network Status: Keep an eye on the performance and status of devices using autoconfigured IP addresses. This helps identify and address issues promptly.

Security Considerations: While link-local addressing simplifies autoconfiguration, it’s essential to consider security implications. Ensure that unauthorized devices cannot gain access to your network through link-local addressing.

In the ever-evolving world of networking, mastering IPv4 address autoconfiguration is a valuable skill. Whether you opt for the convenience of DHCP or the simplicity of link-local addressing, understanding how devices automatically assign IP addresses is crucial for maintaining efficient and reliable networks.

By following best practices and making informed choices, you can ensure that your network operates smoothly and securely, even in the absence of dedicated DHCP servers. IPv4 address autoconfiguration simplifies the management of IP addresses and empowers you to build and maintain efficient networks with ease.

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Understanding IP Address Assignment: A Complete Guide

Introduction

In today's interconnected world, where almost every aspect of our lives relies on the internet, understanding IP address assignment is crucial for ensuring online security and efficient network management. An IP address serves as a unique identifier for devices connected to a network, allowing them to communicate with each other and access the vast resources available on the internet. Whether you're a technical professional, a network administrator, or simply an internet user, having a solid grasp of how IP addresses are assigned within the same network can greatly enhance your ability to troubleshoot connectivity issues and protect your data.

The Basics of IP Addresses

Before delving into the intricacies of IP address assignment in the same network, it's important to have a basic understanding of what an IP address is. In simple terms, an IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. It consists of four sets of numbers separated by periods (e.g., 192.168.0.1) and can be either IPv4 or IPv6 format.

IP Address Allocation Methods

There are several methods used for allocating IP addresses within a network. One commonly used method is Dynamic Host Configuration Protocol (DHCP). DHCP allows devices to obtain an IP address automatically from a central server, simplifying the process of managing large networks. Another method is static IP address assignment, where an administrator manually assigns specific addresses to devices within the network. This method provides more control but requires careful planning and documentation.

Considerations for Efficient IP Address Allocation

Efficient allocation of IP addresses is essential for optimizing network performance and avoiding conflicts. When assigning IP addresses, administrators need to consider factors such as subnetting, addressing schemes, and future scalability requirements. By carefully planning the allocation process and implementing best practices such as using private IP ranges and avoiding overlapping subnets, administrators can ensure smooth operation of their networks without running out of available addresses.

IP Address Assignment in the Same Network

When two routers are connected within the same network, they need to obtain unique IP addresses to communicate effectively. This can be achieved through various methods, such as using different subnets or configuring one router as a DHCP server and the other as a client. Understanding how IP address assignment works in this scenario is crucial for maintaining proper network functionality and avoiding conflicts.

Basics of IP Addresses

IP addresses are a fundamental aspect of computer networking that allows devices to communicate with each other over the internet. An IP address, short for Internet Protocol address, is a unique numerical label assigned to each device connected to a network. It serves as an identifier for both the source and destination of data packets transmitted across the network.

The structure of an IP address consists of four sets of numbers separated by periods (e.g., 192.168.0.1). Each set can range from 0 to 255, resulting in a total of approximately 4.3 billion possible unique combinations for IPv4 addresses. However, with the increasing number of devices connected to the internet, IPv6 addresses were introduced to provide a significantly larger pool of available addresses.

IPv4 addresses are still predominantly used today and are divided into different classes based on their range and purpose. Class A addresses have the first octet reserved for network identification, allowing for a large number of hosts within each network. Class B addresses reserve the first two octets for network identification and provide a balance between network size and number of hosts per network. Class C addresses allocate the first three octets for network identification and are commonly used in small networks.

With the depletion of available IPv4 addresses, IPv6 was developed to overcome this limitation by utilizing 128-bit addressing scheme, providing an enormous pool of potential IP addresses - approximately 3.4 x 10^38 unique combinations.

IPv6 addresses are represented in hexadecimal format separated by colons (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334). The longer length allows for more efficient routing and eliminates the need for Network Address Translation (NAT) due to its vast address space.

Understanding these basics is essential when it comes to assigning IP addresses in a network. Network administrators must consider various factors such as the number of devices, network topology, and security requirements when deciding on the IP address allocation method.

In the next section, we will explore different methods of IP address assignment, including Dynamic Host Configuration Protocol (DHCP) and static IP address assignment. These methods play a crucial role in efficiently managing IP addresses within a network and ensuring seamless communication between devices.

Methods of IP Address Assignment

IP address assignment is a crucial aspect of network management and plays a vital role in ensuring seamless connectivity and efficient data transfer. There are primarily two methods of assigning IP addresses in a network: dynamic IP address assignment using the Dynamic Host Configuration Protocol (DHCP) and static IP address assignment.

Dynamic IP Address Assignment using DHCP

Dynamic IP address assignment is the most commonly used method in modern networks. It involves the use of DHCP servers, which dynamically allocate IP addresses to devices on the network. When a device connects to the network, it sends a DHCP request to the DHCP server, which responds by assigning an available IP address from its pool.

One of the key benefits of dynamic IP address assignment is its simplicity and scalability. With dynamic allocation, network administrators don't have to manually configure each device's IP address. Instead, they can rely on the DHCP server to handle this task automatically. This significantly reduces administrative overhead and makes it easier to manage large networks with numerous devices.

Another advantage of dynamic allocation is that it allows for efficient utilization of available IP addresses. Since addresses are assigned on-demand, there is no wastage of unused addresses. This is particularly beneficial in scenarios where devices frequently connect and disconnect from the network, such as in public Wi-Fi hotspots or corporate environments with a high turnover rate.

However, dynamic allocation does have some drawbacks as well. One potential issue is that devices may receive different IP addresses each time they connect to the network. While this might not be an issue for most users, it can cause problems for certain applications or services that rely on consistent addressing.

Additionally, dynamic allocation introduces a dependency on the DHCP server. If the server goes down or becomes unreachable, devices will not be able to obtain an IP address and will be unable to connect to the network. To mitigate this risk, redundant DHCP servers can be deployed for high availability.

Static IP Address Assignment

Static IP address assignment involves manually configuring each device's IP address within the network. Unlike dynamic allocation, where addresses are assigned on-demand, static assignment requires administrators to assign a specific IP address to each device.

One of the main advantages of static IP address assignment is stability. Since devices have fixed addresses, there is no risk of them receiving different addresses each time they connect to the network. This can be beneficial for applications or services that require consistent addressing, such as servers hosting websites or databases.

Static assignment also provides greater control over network resources. Administrators can allocate specific IP addresses to devices based on their requirements or security considerations. For example, critical servers or network infrastructure devices can be assigned static addresses to ensure their availability and ease of management.

However, static IP address assignment has its limitations as well. It can be time-consuming and error-prone, especially in large networks with numerous devices. Any changes to the network topology or addition/removal of devices may require manual reconfiguration of IP addresses, which can be a tedious task.

Furthermore, static allocation can lead to inefficient utilization of available IP addresses. Each device is assigned a fixed address regardless of whether it is actively using the network or not. This can result in wastage of unused addresses and may pose challenges in scenarios where addressing space is limited.

In order to efficiently allocate IP addresses within a network, there are several important considerations that need to be taken into account. By carefully planning and managing the allocation process, network administrators can optimize their IP address usage and ensure smooth operation of their network.

One of the key factors to consider when assigning IP addresses is the size of the network. The number of devices that will be connected to the network determines the range of IP addresses that will be required. It is essential to accurately estimate the number of devices that will need an IP address in order to avoid running out of available addresses or wasting them unnecessarily.

Another consideration is the type of devices that will be connected to the network. Different devices have different requirements in terms of IP address assignment. For example, servers and other critical infrastructure typically require static IP addresses for stability and ease of access. On the other hand, client devices such as laptops and smartphones can often use dynamic IP addresses assigned by a DHCP server.

The physical layout of the network is also an important factor to consider. In larger networks with multiple subnets or VLANs, it may be necessary to segment IP address ranges accordingly. This allows for better organization and management of IP addresses, making it easier to troubleshoot issues and implement security measures.

Security is another crucial consideration when allocating IP addresses. Network administrators should implement measures such as firewalls and intrusion detection systems to protect against unauthorized access or malicious activities. Additionally, assigning unique IP addresses to each device enables better tracking and monitoring, facilitating quick identification and response in case of any security incidents.

Efficient utilization of IP address ranges can also be achieved through proper documentation and record-keeping. Maintaining an up-to-date inventory of all assigned IP addresses helps prevent conflicts or duplicate assignments. It also aids in identifying unused or underutilized portions of the address space, allowing for more efficient allocation in the future.

Furthermore, considering future growth and scalability is essential when allocating IP addresses. Network administrators should plan for potential expansion and allocate IP address ranges accordingly. This foresight ensures that there will be sufficient addresses available to accommodate new devices or additional network segments without disrupting the existing infrastructure.

In any network, the assignment of IP addresses is a crucial aspect that allows devices to communicate with each other effectively. When it comes to IP address assignment in the same network, there are specific considerations and methods to ensure efficient allocation. In this section, we will delve into how two routers in the same network obtain IP addresses and discuss subnetting and IP address range distribution.

To understand how two routers in the same network obtain IP addresses, it's essential to grasp the concept of subnetting. Subnetting involves dividing a larger network into smaller subnetworks or subnets. Each subnet has its own unique range of IP addresses that can be assigned to devices within that particular subnet. This division helps manage and organize large networks efficiently.

When it comes to assigning IP addresses within a subnet, there are various methods available. One common method is manual or static IP address assignment. In this approach, network administrators manually assign a specific IP address to each device within the network. Static IP addresses are typically used for devices that require consistent connectivity and need to be easily identifiable on the network.

Another widely used method for IP address assignment is Dynamic Host Configuration Protocol (DHCP). DHCP is a networking protocol that enables automatic allocation of IP addresses within a network. With DHCP, a server is responsible for assigning IP addresses dynamically as devices connect to the network. This dynamic allocation ensures efficient utilization of available IP addresses by temporarily assigning them to connected devices when needed.

When considering efficient allocation of IP addresses in the same network, several factors come into play. One important consideration is proper planning and design of subnets based on anticipated device count and future growth projections. By carefully analyzing these factors, administrators can allocate appropriate ranges of IP addresses for each subnet, minimizing wastage and ensuring scalability.

Additionally, implementing proper security measures is crucial when assigning IP addresses in the same network. Network administrators should consider implementing firewalls, access control lists (ACLs), and other security mechanisms to protect against unauthorized access and potential IP address conflicts.

Furthermore, monitoring and managing IP address usage is essential for efficient allocation. Regular audits can help identify any unused or underutilized IP addresses that can be reclaimed and allocated to devices as needed. This proactive approach ensures that IP addresses are utilized optimally within the network.

The proper assignment of IP addresses is crucial for maintaining network security and efficiency. Throughout this guide, we have covered the basics of IP addresses, explored different methods of IP address assignment, and discussed considerations for efficient allocation.

In conclusion, understanding IP address assignment in the same network is essential for network administrators and technical professionals. By following proper allocation methods such as DHCP or static IP assignment, organizations can ensure that each device on their network has a unique identifier. This not only enables effective communication and data transfer but also enhances network security by preventing unauthorized access.

Moreover, considering factors like subnetting, scalability, and future growth can help optimize IP address allocation within a network. Network administrators should carefully plan and allocate IP addresses to avoid conflicts or wastage of resources.

Overall, a well-managed IP address assignment process is vital for the smooth functioning of any network. It allows devices to connect seamlessly while ensuring security measures are in place. By adhering to best practices and staying updated with advancements in networking technology, organizations can effectively manage their IP address assignments.

In conclusion, this guide has provided a comprehensive overview of IP address assignment in the same network. We hope it has equipped you with the knowledge needed to make informed decisions regarding your network's IP address allocation. Remember that proper IP address assignment is not only important for connectivity but also plays a significant role in maintaining online security and optimizing network performance.

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subnet-auto-assign-public-ip-disabled

Checks if Amazon Virtual Private Cloud (Amazon VPC) subnets are assigned a public IP address. The rule is COMPLIANT if Amazon VPC does not have subnets that are assigned a public IP address. The rule is NON_COMPLIANT if Amazon VPC has subnets that are assigned a public IP address.

Identifier: SUBNET_AUTO_ASSIGN_PUBLIC_IP_DISABLED

Resource Types: AWS::EC2::Subnet

Trigger type: Configuration changes

AWS Region: All supported AWS regions except Asia Pacific (Osaka) Region

Parameters:

Proactive Evaluation

For steps on how to run this rule in proactive mode, see Evaluating Your Resources with AWS Config Rules . For this rule to return COMPLIANT in proactive mode, the resource configuration schema for the StartResourceEvaluation API needs to include the following inputs, encoded as a string:

For more information on proactive evaluation, see Evaluation Mode .

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To create AWS Config managed rules with AWS CloudFormation templates, see Creating AWS Config Managed Rules With AWS CloudFormation Templates .

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How-To Geek

How to assign a static ip address in windows 10 or windows 11.

When organizing your home network it's easier to assign each computer it's own IP address than using DHCP. Here we will take a look at doing it in XP,

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What is a static ip address, assign static ip addresses via your router, how to set a static ip address in windows 11, how to set a static ip address in windows 10, how to set a static ip address in windows 7 or 8 using "network connections", set a static ip address in windows vista, set a static ip address in windows xp, key takeaways.

• To set a static IP address in Windows 10 or 11, open Settings -> Network & Internet and click Properties for your active network.
• Choose the "Edit" button next to IP assignment and change the type to Manual.
• Flip the IPv4 switch to "On", fill out your static IP details, and click Save.

Sometimes, it's better to assign a PC its own IP address rather than letting your router assign one automatically. Join us as we take a look at assigning a static IP address in Windows.

A static IP address is manually set to a permanent, fixed address rather than being assigned automatically by your router using a procotol known as Dynamic Host Configuration Protocol (DHCP). DHCP is a handy way for devices to connect to your network more easily, because you don't have to configure IP addressing for each new device yourself. The downside to automatic addressing is that it's possible for a device's IP address to change from time to time, which is why people choose static IPs for certain types of devices. For example:

• You have a device like a home media server that you want to be able to find using the same IP address or host name each time.
• You have certain apps that can only connect to network devices using their IP address. In particular, many older networking apps suffer this limitation.
• You forward ports through your router to devices on your network. Some routers play nice with port forwarding and dynamic IP addresses; others do not.

Whatever your reason, assigning static IP addresses to devices is not difficult, but you do have a choice to make---whether to do it from the router or on the device itself.

Related: How to Set a Static IP Address in Ubuntu

While this article covers assigning static IP addresses to PCs within Windows itself, there is another way to go about it. Many routers allow you to assign a pool of IP addresses that are handed out to specific devices (based on the device's physical, or MAC address). This method offers a couple of significant advantages:

• IP addresses are still managed by the router, meaning that you won't have to make (and keep up with) changes on each individual device.
• It's easier to assign addresses within the same IP address pool your router uses.

This article is about assigning static IP addresses directly to PCs running Windows. We've already got a great guide on How to Set Static IP Addresses On Your Router , so if that's the way you want to go, be sure to give it a read.

With all that in mind, though, let's take a look at how to assign static IP addresses within any version of Windows.

Related: How to Find Your Router's IP Address on Any Computer, Smartphone, or Tablet

To set a static IP address in Windows 11, you'll want to open Settings, go to Network & Internet, and then find the Properties for your network. Inside there you'll be able to click the Edit button for IP Assignment and then fill out the manual network details.

First, open up the Settings app and then find Network & Internet on the left-hand side. You'll be presented with a panel that shows your current network connection. You can click where it says "Properties" right underneath the network, or if you have multiple network connections you can drill down into the specific network to see the IP address details for each one . In this case it's called "Ethernet", but you will most likely see "Wi-Fi" as the option to choose.

Once you've drilled down into the network connection that you want to set a manual IP for, scroll down until you see "IP Assignment" and then click the Edit button to the right.

Once there, you'll flip the drop-down to "Manual" and switch the IPv4 switch to "On". At this point you can fill out your network details and click Save to finish.

You can also use the old-school Network Connections panel in Windows 11, so if you prefer to use that method, keep reading.

If you're interested in more advanced networking, you might need to set up a static TCP/IP route , reset the entire TCP/IP stack on Windows , check open TCP/IP ports , find your MAC address on Windows , or find your IP address from the Command Prompt . We've got you covered there too.

To set a static IP address in Windows 10, you'll need to open the Settings app and drill down to Network & Internet. From there you'll select Properties for your network, and then the Edit button next to IP Assignment where you can input a manual IP address.

First, open the Settings app and locate the Network & Internet button.

On the next screen you'll see your network status, which should show you your active network. Here you'll want to click the Properties button. If you have multiple different networks, you could select them from the left-hand menu---in our case you'll notice we have both Wi-Fi and Ethernet networks, so you'll want to pick the one that you are trying to set a manual IP address for. You'll notice this is the same method we use when we're trying to find an IP address on Windows 10 .

On the network properties screen, scroll down until you see "IP settings" and click the Edit button under "IP assignment".

In the resulting popup window, change the Edit IP settings dropdown to Manual and then flip the IPv4 switch to "On". Fill out the details, click Save, and you should be good to go.

You might need to reboot to get all of your applications to work properly, just because it's Windows.

It's worth noting that you can use the old Network Connections method to set an IP address in any version of Windows, so if you prefer that method, keep reading.

To change the computer's IP address in Windows 7, you'll need to open the "Network Connections" window. Hit Windows+R, type "ncpa.cpl" into the Run box, and then hit Enter.

In the "Network Connections" window, right-click the adapter for which you want to set a static IP address, and then select the "Properties" command.

In the properties window for the adapter, select "Internet Protocol Version 4 (TCP/IPv4)" and then click the "Properties" button.

Select the "Use the following IP address" option, and then type in the IP address, subnet mask, and default gateway that corresponds with your network setup. Next, type in your preferred and alternate DNS server addresses. Finally, select the "Validate settings upon exit" option so that Windows immediately checks your new IP address and corresponding information to ensure that it works. When you're ready, click the "OK" button.

And then close out of the network adapter's properties window.

Windows automatically runs network diagnostics to verify that the connection is good. If there are problems, Windows will give you the option of running the Network troubleshooting wizard. However, if you do run into trouble, the wizard likely won't do you too much good. It's better to check that your settings are valid and try again.

Changing your IP from DHCP to a Static address in Vista is similar to other versions of Windows, but getting to the correct location is a bit different. Open the Start Menu, right-click on Network, and select Properties.

The Network and Sharing Center opens...click on Manage network connections.

Right-click on the network adapter you want to assign an IP address and click Properties.

Highlight Internet Protocol Version 4 (TCP/IPv4) then click the Properties button.

Now change the IP, Subnet mask, Default Gateway, and DNS Server Addresses. When you're finished click OK.

You'll need to close out of Local Area Connection Properties for the settings to go into effect.

Open the Command Prompt and use the

command to verify that the changes were successful.

To set a Static IP in Windows XP, right-click the "My Network Places" icon, and then select "Properties."

Right-click the adapter for which you want to set the IP, and then select "Properties" from the context menu.

Select the "Internet Protocol (TCP/IP)" entry, and then click the "Properties" button.

Select the "Use the following IP address" option. Type in the IP address, subnet mask, default gateway, and DNS server addresses you want to use. When you're finished, click the "OK" button.

You will need to close out of the adapter's properties window before the changes go into effect.

And you can verify your new settings by using the

 command at the command prompt.

By and large, it's better to let most of your devices have their IP addresses assigned automatically by your router. Occasionally, though, you might want to set a static IP address for a particular device. While you can set static IP addresses directly on your devices (and this article has shown you how to do just that on Windows PCs), we still recommending setting up static IP addressing on your router if possible. It will just make life easier.

Related: How to Find Any Device's IP Address, MAC Address, and Other Network Connection Details

Each IPv6 node on the network needs a globally unique address to communicate outside its local segment. But where a node get such an address from? There are a few options:

• Manual assignment - Every node can be configured with an IPv6 address manually by an administrator. It is not a scalable approach and is prone to human error.  
• DHCPv6 (The Dynamic Host Configuration Protocol version 6) - The most widely adopted protocol for dynamically assigning addresses to hosts. Requires a DHCP server on the network and additional configuration.
• SLAAC (Stateless Address Autoconfiguration)   -  It was designed to be a simpler and more straight-forward approach to IPv6 auto-addressing. In its current implementation as defined in RFC 4862 , SLAAC does not provide DNS server addresses to hosts and that is why it is not widely adopted at the moment. 

In this lesson, we are going to learn how SLAAC works and what are the pros and cons of using it in comparison to DHCPv6.

What is SLAAC?

SLAAC stands for Stateless Address Autoconfiguration and the name pretty much explains what it does. It is a mechanism that enables each host on the network to auto-configure a unique IPv6 address without any device keeping track of which address is assigned to which node.

Stateless and Stateful in the context of address assignment mean the following:

• A stateful address assignment involves a server or other device that keeps track of the state of each assignment. It tracks the address pool availability and resolves duplicated address conflicts. It also logs every assignment and keeps track of the expiration times.
• Stateless address assignment means that  no server keeps track of what addresses have been assigned and what addresses are still available for an assignment. Also in the stateless assignment scenario, nodes are responsible to resolve any duplicated address conflicts following the logic: Generate an IPv6 address, run the Duplicate Address Detection (DAD), if the address happens to be in use, generate another one and run DAD again, etc.

How does SLAAC work?

To fully understand how the IPv6 auto-addressing work, let's follow the steps an IPv6 node takes from the moment it gets connect to the network to the moment it has a unique global unicast address.

Step 1: The node configures itself with a link-local address

When an IPv6 node is connected to an IPv6 enabled network, the first thing it typically does is to auto-configure itself with a link-local address. The purpose of this local address is to enable the node to communicate at Layer 3 with other IPv6 devices in the local segment. The most widely adopted way of auto-configuring a link-local address is by combining the link-local prefix FE80::/64 and the EUI-64 interface identifier, generated from the interface's MAC address. 

Figure 1 shows a step by step example of how a local address is generated from MAC address 7007.1234.5678.

Once the above steps are completed, the node has a fully functional EUI-64 format link-local address as shown below:

Step 2: The node performs Duplicate Address Detection (DAD)

After the IPv6 host has its link-local address auto-configured, it has to make sure that the address is actually unique in the local segment. Even though the chances that another node has the same exact address are very slim. It has to perform a process called Duplicate Address Detection (DAD).

DAD is a mechanism that involves a special type of address called solicited-node multicast . Upon configuring an IPv6 address, every node joins a multicast group identified by the address FF02::1:FFxx:xxxx where xx:xxxx are the last 6 hexadecimal values in the IPv6 unicast address. Therefore, for each configured unicast address, no matter if it is link-local or global, the host joins the respective auto-generated solicited-node multicast group.

In our example, the last 6 hexadecimal values of the link-local address are 34:5678 so the node joins the multicast group FF02::1:FF 34:5678 . As PC1 is running a Windows 10 operating system, we can verify that with the following command:

Having this logic in mind, we know that if another host has the same exact link-local address, it will also be listening for messages on the solicited-node multicast group auto-generated from this address - FF02::1:FF34:5678. In order for PC1 to check that, it sends an ICMPv6 message with a destination address set to this group, and the source address set to the IPv6 unspecified address. In the ICMPv6 portion of the packet, PC1 puts the whole address in the Target Address field. Figure 2 illustrates that process. PC1 then sends the packet on the network. Only nodes that are listening to this exact auto-generated multicast group will open the packet, all other nodes will discard it. If any node has an IPv6 address that has the same last 6 hex digits, will look in the ICMPv6 portion and check if the target address matches any of its own addresses. If there is a match, the host will reply back that this IPv6 address is already in use. If nobody replies back, PC1 will conclude that this address is unique and available to be used, and will assign it.

This process is called Duplicate Address Detection (DAD) and is done upon every new address assignment. In our example, PC1 sends the ICMPv6 Neighbor Solicitation message as shown in figure 2, and nobody replies back. PC1 will then know for sure that this link-local address is unique in this local segment.

Step 3: The node sends a Router Solicitation message

Step 1 and 2 in this example depict the process of generating and assigning a unique link-local address. This process is not exactly part of the Stateless Autoconfiguration feature but without a link-local address, PC1 won't be able to communicate at layer 3 with any other IPv6 node. Thus, it is a pre-requisite for the SLAAC to work and that's why we have included it in our example.

After PC1 has a link-local address, it can now start the process of auto-configuring a global unicast address using SLAAC. The first step of this process is to send an ICMPv6 message called Router Solicitation (RS) . The purpose of this message is to ' ask ' all IPv6 routers attached to this segment about the global unicast prefix that is used. The destination address is the all-routers multicast address FF02::2 and for source, PC1 uses its link-local address. Note that only routers are subscribed to multicast group FF02::2, which means that only Router 1 will process this message, and all other nodes on the local segment will discard it.

After Router 1 gets the Router Solicitation message, it responds back with an ICMPv6 message called Router Advertisement (RA). The RA message includes the global IPv6 prefix on the link and the prefix length. In our example, these would be the prefix 2001:1234:A:b:: and the prefix length of /64. For the source of this RA packet, Router 1 uses its own link-local address and destination is the all-nodes multicast address FF02::1. The process is illustrated in figure 3.

Step 4: The node configures its global unicast address

Once PC1 gets back the Router Advertisement from  Router 1, it combines the prefix 2001:1234:A:B::/64 with its EUI-64 interface identifier (7207:12FF:FE34:5678) resulting in the global unicast address 2001:1234:A:B:7207:12FF:FE34:5678/64. Because the Router Advertisement came from Router 1, PC1 sets its IPv6 default gateway to the link-local address of R1.

Now PC1 has a global unicast address and a default gateway. But the SLAAC process is not completed. PC1 must know for sure this auto-generated address is unique in the local segment. Thus, PC1 performs the Duplicate Address Detection (DAD) process. 

Step 5: The node performs Duplicate Address Detection (DAD)

We have already explained the DAD process in detail in step 2. When PC1 auto-generate its global unicast address, it immediately joins the auto-generated solicited-node multicast group FF02::1:FF34:5678. To be sure that nobody else is using this address, PC1 then sends an ICMPv6 message called Neighbor Solicitation to the solicited-node address FF02::1:FF34:5678 and waits to see if a node replies back. If no reply is received back, PC1 knows that this address is unique and can start using it for communication outside its local segment including on the Internet.

The problem with SLAAC

So far so good. We have seen how a node can auto-configure a globally unique IPv6 address and a default gateway.

However, SLAAC does not provide DNS information and without DNS, many services such as surfing the Internet are not possible.  

There is a field in the Router Advertisement header, that is designed to solve this problem.

Router Advertisement Flags

As we said above, by default, SLAAC does not provide DNS. And without DNS, many services that require resolution from URL addresses to IP won't work. There is a field in the RA message that helps nodes understand where to get an IPv6 address and DNS information from. 

If the M-flag is set to 1, it indicates that addresses are available via DHCPv6. The router is basically telling the nodes to ask the DHCP server for addresses and DNS information. If the M flag is set, the O flag can be ignored because DHCPv6 will return all available information.

If the O-flag is set to 1, it indicates that DNS information is available via DHCPv6. The router is basically telling the nodes to auto-configure an address via SLAAC and ask the DHCP server for DNS information.

If neither M nor O flags are set, this indicates that no DHCPv6 server is available on the segment.

The Prf-flag (Default Router Preference) can be set to Low (1), Medium (0), or High(3). When a node receives Router Advertisement messages from multiple routers, the Default Router Preference (DRP) is used to determine which router to prefer as a default gateway.

Configuring SLAAC on Cisco routers

Typically, when IPv6 unicast-routing is enabled on a Cisco router, it starts to send RA messages via all interfaces that have a configured IPv6 global unicast address. 

In our example, when interface GigabitEthernet 0/0 is configured with a global IPv6 unicast address, it immediately starts sending RA messages on the local segment. 

Most parameters can be verified using the show ipv6 interface command

If there is a DHCPv6 server available on the segment, we can set the M-flag or the O-flag in the RA messages using the following options. 

If you'd like to disable the SLAAC feature on this interface, you can use the suppress command under the interface ipv6 options

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