I recently added a DNS server in Azure and added the DNS server to the Virtual Network configuration (thanks for that change to dynamically add/change DNS servers in VNs, BTW :-)), but curious the priority that a VM uses for name resolution? I previously had 3 DNS servers that were all on our corpnet (Azure Local Network) and added a 4th DNS server to the VN configuration (the DNS server we added in Azure VM).
When we do an ipconfig, the DNS server in Azure is the 4th on the list. We ran a test to verify that we could still get name resolution if the Azure VN gateway was down (ie, the VMs would use the DNS server we just added in Azure), but it looks like the VMs use the 1st DNS server only and time out if they can't reach this (which is the case since we dropped the VPN Gateway for this test).
Is there any way to force the VMs to use the DNS server we recently added as the primary DNS server?