I can’t get a VPN split tunnel (either Wireguard or OpenVPN) to maintain a steady connection over 4G. When I set the modem to send all traffic through the VPN, there is a stable connection. When I set the modem to let all traffic bypass the VPN (but still have the VPN active), there is a stable connection. When I set the modem to send only the “guest” network traffic over VPN, the 4G connection will frequently restart.
Additionally, I have tried disabling MWAN3 because I thought maybe the ping was being routed through the VPN and was causing MWAN3 to restart the modem interface. I’ve also tried manually overriding the DNS settings (via the GL menu) with cloudflare DNS servers.
The only other setting I have changed on the firmware is adding the following rule to the firewall: iptables -t mangle -I POSTROUTING -o wwan0 -j TTL --ttl-set 64
I’ve tried the setup without the firewall rule and have experienced similar results though. The whole point of this setup is to be able to have two WiFi networks, one that routes directly to the internet, and the other that routes through a VPN (in order to bypass video throttling restrictions). This way, non-streaming devices such as game-consoles and computers can connect to the non-VPN network and video streaming devices such as smart-TVs can connect to the VPN network.
This is an urgent matter as I need to be able to ship out 50 X750 units with this sort of configuration to customers within the next week.
If anybody can help me with this, please let me know. I can accommodate live troubleshooting (regardless of timezone).