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Solved: How do I configure Azure routing to Site-to-Site?

Question

I have an Azure environment (10.50.0.0/24) which has a Site-to-Site towards an on-prem environment (10.1.0.0/24). I have some extra subnets (10.90.0.0/24 and 192.168.10.0/24) on the on-prem environment that I want to make available to the Azure machines.

Is it correct that I have to create a routing table containing the extra on-prem routes (10.90.0.0/24 and 192.168.10.0/24, pointing to the gateway), and attach it to the subnet, so that it gets routed to our on-prem router? I have tried that, but it seems that it then drops the existing default azure routes (towards internet and 10.1.0.0/24).

We have about 40 subnets that needs to be available over the Site-to-Site (both on-prem local networks and some remote networks over separate VPNs), do we need to add them all as a Phase 2 SA on the Site-to-Site?

Solution

If you edit the local network gateway you have; this is where you add the IPs:

Yes, you will need to specify the source and destination Subnets on your Router/Firewall VPN.

Reference

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