Azure APIM Private IP Change : APIM is integrated with Application Gateway

Question

Hi,

I have Application Gateway which is forwarding the traffic to Azure APIM on private network.
The setup is old and the configurations are :

App Gateway has a backend pool - gw.mycompany.com which is an A record to a.b.c.69
But APIM private ip as see in Azure portal is a.b.c.70

only last octet is different in ip.

I am not sure how they became different and how the traffic is still running successfully ?

I am sure A record did not change and MS also won't change private ip of APIM load balancer right ?
Did stv2 upgrade could have triggered this APIM private ip change ?

Answer 1

Hi @Amit-J Thanks for reaching out. Yes, upgrading from stv1 to stv2 can change the Private ip address. Only the last Octet is different because it has to be an IP Address from your subnet. It might still work since what was previously the load balanced VIP might now be the DIP (Private IP) of one of the machines.

Let me know incase of further queries, I would be happy to assist you.

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