Some peers see timeouts (MTU)

[matt-allan]

I've only seen this once, on an Ubuntu host using wg-quick and Network Manager. The connection worked but they were unable to use SSH because of timeouts. The issue was resolved by editing the wg config to specify the MTU:

[Interface]
MTU=1300

# -- SNIP --

Seems to be the same as this issue: https://askubuntu.com/questions/1229456/ssh-fails-with-connection-timed-out-in-vpn-and-hangs-here-expecting-ssh2-msg

Relevant info:

https://lists.zx2c4.com/pipermail/wireguard/2017-December/002201.html

https://www.ovpn.com/en/faq/client/explanation-mtu

https://fasterdata.es.net/network-tuning/mtu-issues/debugging-mtu-problems/

Possible solution:

I don't think we can really do anything here since we don't want to lower the MTU for users that don't have issues. But maybe we can document this in a FAQ and add an option flag to set the MTU when the config is generated?