Azure Express route ip prefix

Question

Expressroute in Azure Is there a way to use a public IP address instead of a private one for Nat? If so, what was the ip prefix standard we can use is there anything specific ?

for example /29 /30 iprefix suggestions? Express route NAT using public ip

Answer 1

In Azure ExpressRoute, you can use a public IP address instead of a private one for NAT.

Using public Ip address of NAT you must use a unique /29 subnet or two /30 subnets. The specific IP prefix that you choose will depend on your specific requirements and the size of your virtual network.

Note: NAT Gateway supports a maximum of 16 IP addresses. the quota for prefix addresses 17 exceeds limit of 16

You can choose /29 or/30 Ip prefix like below:

Check the MsDoc ExpressRoute routing requirements.

Ensure that in your virtual network subnet Nat gateway is associated like below:

References:

Manage a public IP address with a NAT gateway - Azure Virtual Network | Microsoft Learn

Azure ExpressRoute: NAT requirements for circuits | Microsoft Learn