br0/eth0: 192.168.2.x LAN wwanx: LTE uplink The other side is similar. The boxes can reach each other fine over LTE. The part I’m trying to solve is the LANs behind them: devices on both sides should be able to talk to each other normally.

I first tried NAT + iptables rules, but it doesnt work I have also wireguard tunnel between LTE'S for trying failover.

Gre is the cleanest thing I’ve found.Its working and connection established.

Is that what people normally use for this, or am I missing a simpler approach? I thought NAT should work