GL-E750 V2 no VPN Wireguard connection via mobile network

Technical Support for Routers VPN, DNS, Leaks
1

Dear Support Team,
I am contacting you because I have encountered a problem where I can no longer solve the fault myself.

I bought the GL.inet GL-E750 V2 a few weeks ago. I have the problem that I can only connect to the mobile network.
I cannot establish a connection to my Wireguard server. If I deactivate the mobile network and establish a connection
I can connect to the Wireguard server via the repeater. It just doesn't work over the mobile network.

I have reset the GL-750 V2 to factory settings.
I have reinstalled the latest firmware version 4.3.19.
I have installed the beta firmware 4.3.21.

All these attempts have not been able to establish a VPN connection to my Wireguard, it only works via repeaters.
If I deactivate the Wireguard client in the GL-E750 V2, I can connect via the mobile network without any problems.

Can anyone help me?

2

Probably the mobile network limit something to not allow the VPN connection, not sure.

You can reduce the MTU of wireguard client, less than 1380 or 1280 or lower to try.

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4

Hello Bruce,
thank you very much for your help, I have lowered the MTU step by step 1380-1280 ... down to 880 and tried several times. Unfortunately this did not help. I use Turkcell as my provider. Could I try something else, do you have any ideas?

Best regards Özkan