MTU - Nightmare

[B08Z]

Hey,
The VPS that I am using has, due to some routing issues, reduced the upstream MTU from 1500 to 1476.
This seems to have caused multiple issues, but I have managed to get access to some of my services by reducing the client side MTU to 1380.

This is ok for cli deployments but I cant workout how to do it with docker. I have a docker wiredoor as a gateway to my services.

Inspecting the WG config I can see that the MTU is 1420. I can change it as I am not root.

Any ideas - maybe this is an option that the advance tab could support?

[dmesad]

Hi @B08Z,

You can globally control the MTU used by all Wiredoor clients by defining the following environment variable on the Wiredoor server container.

Steps:

1. Set the environment variable on your .env file:

VPN_DEFAULT_MTU=1380

This value will be propagated to all Wiredoor clients and gateways.

2. Recreate the wiredoor container:

docker compose up -d --force-recreate wiredoor

3. Restart the wiredoor-gateway client in docker so it receives the updated configuration.

[B08Z]

Thanks so much - this has saved me a whole lot of pain!