I'm trying to set up peering between two Azure virtual networks (VNets) so they can communicate, but I've hit a snag. One of the VNets is in the 10.0 range while the other is using the 172.0 range. I've already established peering relationships from a virtual hub linked to the 10.0 VNet, but I'm uncertain about connecting it to the 172.0 VNet. I've read that this should be doable, but I might need to configure routing tables, which I've attempted but can't confirm if they're set up correctly. Any insights or guidance would be hugely appreciated!
2 Answers
It’s important to know that in Azure, peer connections aren't transitive. This means if you have VNet A connected to your hub, and VNet B also connected to that hub, VNet A and B can’t directly communicate with each other unless you set up additional configurations.
The best approach is to place a virtual appliance like an Azure Firewall in the hub and configure route tables to send traffic through the firewall’s private IP. If that sounds too complex, a simpler, albeit less ideal, solution would be to peer VNet A directly with VNet B.
How are you verifying the communication between these VNets? In my experience, VNet peering works smoothly even with different address ranges. My setup uses a hub-and-spoke architecture where the hub and spokes have different ranges, and everything connects just fine.
If you want them to communicate directly, you need to ensure they are set up correctly. If you're simply trying to link the two isolated VNets, that might be where the issue is.
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