Azure VNET Gateway for Expressroute - impact if public IP changes

Question

I have a production environment that has a VNET Gateway (type Expressroute) and it's working fine right now. However, the public IP that it has is a Basic SKU, and that's going away on September 30, 2025. On top of that, it's a dynamic Public IP.

I know that I'll have to remove the Public IP from the VNET Gateway, change it from dynamic to static, then change the SKU to Standard, and put the Public IP back on the VNET Gateway. I have heard that this will change the IP. I haven't see how that IP is actually used. It's not in any other configuration of anything that I can see.

Assuming that the IP will change, is there anything that I would need to do to keep the VNET Gateway working with the new IP? Thanks in advance for any help.

Answer 1

@Chris Lhamon ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

I understand that you would like to upgrade your Basic Public SKU using ExpressRoute Gateway to use a Standard Public SKU.

AFAIK, The public IP address is used for internal management only.

See : Why is there a public IP address associated with the ExpressRoute gateway on a virtual network?

With that said,

• I should highlight the fact that you don't have to be concerned by this.
• Because, to upgrade an ExR Gateway - New ExpressRoute Gateway is required anyway
  • See : Upgrading a basic public IP address to Standard SKU - Guidance
  • 
• Also, there is no requirement here that you should use the same Public IP (basic upgraded to Standard) with the new ExR Gateway - you can use a different Public IP as well.
• Since you are creating a new ExR Gateway, you should also create new connections to ExR Circuits that were previously using the old ExR Gateway
  • While you do this, the platform will consider the new ExR Gateway with the newer IP for it's internal management
  • i.e., everything is handled by platform.

TL:DR;

• You are basically deleting and recreating the ExR Gateway and it's Connections
• So it does not matter if the Public IP of the Gateway changes or not.
• For more info, see : ExpressRoute Gateway migration guidance.

Please let us know if we can be of any further assistance here.

Thanks,

Kapil

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