Public IP change of Azure Route Server and Virtual Network Gateway

Question

Public IP change of Azure Route Server and Virtual Network Gateway

Alex H 45

Hello,

I need to change the public static IP addresses associated with an existing Azure Route Server and Virtual Network Gateway (used for ExpressRoute).

Is there a supported way to update or change the public IP address of these existing resources? Or do I need to deploy new instances with the desired public IP addresses and then decommission the current ones?

Appreciate your guidance on the best approach.

Thanks.

Deepanshukatara-6769 16,565 Reputation points Moderator

2025-06-24T06:16:45.1833333+00:00

Hello Alex, Welcome to MS Q&A

To change the public IP addresses associated with an existing Azure Route Server and Virtual Network Gateway, you typically need to manage the public IP resources directly. Here are some key points to consider:

View and Modify Public IP Settings: You can view and modify settings for a public IP address, such as the idle timeout, DNS name label, or assignment method. However, changing the assignment method from static to dynamic will result in losing the current IP address.

Change Public IP Address: To change the IP address, you would typically need to dissociate the current public IP from the resource and then associate a new public IP address. This process involves creating a new public IP address and updating the resource configuration to use this new IP.

Deletion and Re-association: If you need to delete a public IP, ensure it is not associated with any IP configuration or virtual machine network interface. Once deleted, the IP address cannot be recovered.

For specific steps and commands, you can refer to Create, change, or delete an Azure public IP address.

Kindly check and let us know if any further ques

Thanks
Deepanshu
Alex H 45 Reputation points

2025-06-25T00:20:38.35+00:00

Public IP-RouteServer.png

Hi Deepanshu,

Thank you for getting back to me.

I have a follow-up question — is there a way to dissociate the current public IP address from specific resources, such as the Virtual Network Gateway and Route Server, and then associate a new public IP?

In the Azure portal, the Dissociate and Associate options are greyed out for these resources.

Please refer to the attached screenshot of public IP address for Route Server as an example.

Thanks again,
G Sree Vidya 2,270 Reputation points Microsoft External Staff Moderator

2025-06-25T05:34:06.87+00:00

Hello Alex H

I wanted to follow up and check if you had the opportunity to review the information provided by Deepanshukatara-6769in our previous post.

Kindly let us know if the above helps or you need further assistance on this issue.
Alex H 45 Reputation points

2025-06-25T06:06:32.51+00:00

I am still waiting for answer for my follow-up quiestion.
Alex H 45 Reputation points

2025-06-25T23:37:36.3066667+00:00

Thank you @G Sree Vidya for clarification. It helped a lot.
G Sree Vidya 2,270 Reputation points Microsoft External Staff Moderator

2025-06-26T01:06:47.35+00:00

Hello Alex H

I'm glad it was helpful to you.

I have converted my Previous comment to answer,

If an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!

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Deepanshukatara-6769 16,565 Reputation points Moderator

2025-06-24T06:16:45.1833333+00:00

Hello Alex, Welcome to MS Q&A

To change the public IP addresses associated with an existing Azure Route Server and Virtual Network Gateway, you typically need to manage the public IP resources directly. Here are some key points to consider:

View and Modify Public IP Settings: You can view and modify settings for a public IP address, such as the idle timeout, DNS name label, or assignment method. However, changing the assignment method from static to dynamic will result in losing the current IP address.

Change Public IP Address: To change the IP address, you would typically need to dissociate the current public IP from the resource and then associate a new public IP address. This process involves creating a new public IP address and updating the resource configuration to use this new IP.

Deletion and Re-association: If you need to delete a public IP, ensure it is not associated with any IP configuration or virtual machine network interface. Once deleted, the IP address cannot be recovered.

For specific steps and commands, you can refer to Create, change, or delete an Azure public IP address.

Kindly check and let us know if any further ques

Thanks
Deepanshu
Alex H 45 Reputation points

2025-06-25T00:20:38.35+00:00

Public IP-RouteServer.png

Hi Deepanshu,

Thank you for getting back to me.

I have a follow-up question — is there a way to dissociate the current public IP address from specific resources, such as the Virtual Network Gateway and Route Server, and then associate a new public IP?

In the Azure portal, the Dissociate and Associate options are greyed out for these resources.

Please refer to the attached screenshot of public IP address for Route Server as an example.

Thanks again,
G Sree Vidya 2,270 Reputation points Microsoft External Staff Moderator

2025-06-25T05:34:06.87+00:00

Hello Alex H

I wanted to follow up and check if you had the opportunity to review the information provided by Deepanshukatara-6769in our previous post.

Kindly let us know if the above helps or you need further assistance on this issue.
Alex H 45 Reputation points

2025-06-25T06:06:32.51+00:00

I am still waiting for answer for my follow-up quiestion.
Alex H 45 Reputation points

2025-06-25T23:37:36.3066667+00:00

Thank you @G Sree Vidya for clarification. It helped a lot.
G Sree Vidya 2,270 Reputation points Microsoft External Staff Moderator

2025-06-26T01:06:47.35+00:00

Hello Alex H

I'm glad it was helpful to you.

I have converted my Previous comment to answer,

If an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!

Answer 1

Hi Alex H

Thanks for the follow-up!

In Azure, the "Dissociate" and "Associate" options for Public IPs are often greyed out for certain resources like: Virtual Network Gateway, Azure Route Server

This is by design, because these resources are tightly coupled with their public IPs during creation.

Possible workaround would be to create new IP and recreate the resources.

Unfortunately, you must delete and recreate the Virtual Network Gateway or Route Server with the new public IP.
During creation, select the new public IP.

Kindly let us know if the above helps or you need further assistance on this issue.

Note: This process involves downtime, as deleting and recreating the gateway disrupts connectivity. Microsoft recommends planning this change during a maintenance window.

If you have any other questions or are still running into more issues, please let me know.

Thank you again for your time and patience throughout this issue.

Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.

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Public IP change of Azure Route Server and Virtual Network Gateway

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