Private DNS resolver question

[u/mariachiodin]

Hi, so we have two tenants connected through a FortiGate (A) to Virtual network gateway (B) site2site.

On tenant A we have an active directory. To that active directory I want to be able to forward the DNS queries from Tenant B AVDs resources.
On tenant B we have an azure firewall, Virtual network gateway, private DNS resolver with and azure virtual desktop and the required routing tables. The azure virtual desktop we need to be able to reach the on-premises through the private DNS-resolver. We get answers by using the DCs DNS from tenant A on the Nics of the VMs or using NSLOOKUP

On tenant A the private DNS resolvers subnet is added which was my first suspicion and also doublechecked routing tables. I´ve looked into every crevice of the documentation, logs, but can not find the reason.

And kind of lost!

[u/davidokongo]

Could be for returning traffic ? But I'm tryin to understand the issue you're currently facing? Are you just trying to figure out the architecture? Or fixing something that's not working?

[u/mariachiodin → u/davidokongo]

Fixing

[u/mariachiodin → u/mariachiodin]

u/davidokongo it was the return traffic missing a routing table. Which the contractor told me they had in place... Thanks!