How to ping a LAN behind a VPN router client from another VPN client?

I am trying to access my LAN devices over a WireGuard VPS setup. I have 2 WireGuard peers connected to a WireGuard server having a public IP on AWS EC2 running Ubuntu. I am new to WireGuard and also a networking newbie but this is what I have got working so far. This is the setup I'm using: network setup ping 10.66.66.1 works from A ping 10.66.66.2 works from A ping 10.66.66.1 works from B ping 10.66.66.3 works from B The issue is when I try to ping the LAN behind R3 from A. ping 192.168.102.10 results in timed out. tracert 192.168.102.10 shows the first hop to 10.66.66.1. All subsequent hops

Question by Omkar Pai on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.