Neither OpenVPN nor Wireguard allow clients to access the LAN or exit from it to the outside

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There are many questions like this one, i.e. why hosts on the VPN LAN cannot be pinged, and I went over dozens of them, but in each instance the difference is that they forgot to open their firewalls or something silly along those lines, which I had eliminated along the way of setting things up. In the process of setting up an edge router in a remote office, I configured the NAT and firewall to…

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