I have an RT-AC88U at home, running Merlin 380.68_4.
The box runs an OpenVPN server. I can remotely connect to and access my LAN, and forward traffic out to the Internet.
The box also runs several concurrent OpenVPN clients with selective routing. From my LAN, traffic is correctly routed to each of these VPNs.
All of the above operates in TUN mode and works as expected.
The only thing that doesn't work is having the server and the clients talk to each other. In other words, if I connect...
RT-AC88U: Forwarding traffic between OpenVPN server and OpenVPN clients
The box runs an OpenVPN server. I can remotely connect to and access my LAN, and forward traffic out to the Internet.
The box also runs several concurrent OpenVPN clients with selective routing. From my LAN, traffic is correctly routed to each of these VPNs.
All of the above operates in TUN mode and works as expected.
The only thing that doesn't work is having the server and the clients talk to each other. In other words, if I connect...
RT-AC88U: Forwarding traffic between OpenVPN server and OpenVPN clients