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I have 2 resource group with different vnet but same address type, Can i create a common application gateway on either of the resource group with out VNET peering? (I am using private endpoints for app services, I need to create single application gateway for both the resource groups with out vnet peering)

JINU JANAN
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  • As per [this](https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-faq#does-application-gateway-support-virtual-network-peering) its 'yes' – Jayendran Jun 17 '22 at 09:08
  • How ? I have two rg with different VNETs both are of same address type. – JINU JANAN Jun 17 '22 at 10:26
  • Sorry I meant to say no.it's possible with vnet peering but if you have same address type, it can't be peered. – Jayendran Jun 17 '22 at 13:28
  • There is a new feature(preview) that looks what you need. Can check this [Private link support in Azure Application Gateway](https://learn.microsoft.com/en-us/azure/application-gateway/private-link-configure?tabs=portal) – Jayendran Jun 21 '22 at 10:22
  • Hi @JINUJANAN, did the suggested solution work for you? Do let me know if it solved your problem else share more details so I can troubleshoot or else do accept it for helping other community members. – Kartik Bhiwapurkar Jul 25 '22 at 04:26

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I tried to reproduce with my environment but I found some issues. They are as below: -

a) In application gateway we can surely connect with resources, i.e., App services, VMs, VMSS in different resource groups and different VNets but they should all have a public IP address or a publicly accessible FQDN (endpoint).

b) Also, in an application gateway, we can add resources with private endpoints in the backend pool but they should be in the same resource group as the application gateway.

Please find the below snapshots for more clarification: -

Application gateway --> Frontends

Application Gateway frontends

In the front end pool, application gateway supports only one public or one private IP address

Backend pool

Backend pool

In the backend pool, the target IP address allows only private ip address in current resource group or public endpoints for app service in the any other resource group.

Reference: -

  1. Application Gateway integration
  2. Frequently asked questions about Azure Application Gateway
Kartik Bhiwapurkar
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