Hi friends of Wireguard, i am neither a network guru nor a kernel hacker and after all i had no time to fully investigate the case. so please read with a grain of salt.
i had my notebook in a wifi network lately that seemed to have some MTU size problems. download worked fine while uploads blocked for bigger packages. when i set the MTU down to 1200 on the wg interface the same upload worked fine. this was obviously a problem of that very wifi network and is not related to wg at all, the dhcp answer did not even contain any MTU hints, so 1500 was assumed. anyway the kernel locked up. commands like `ip` or `wg-quick down ...` get stuck and ^C oder even a `kill -9 ...` did not end the processes. any access to the wg interface blocked. my question is if that scenario (misconfigured MTU size in the "outer network") is tested and works fine. i know that MTU size problem lead to lockups (that's why i immediatly came to that conclusion) but never saw such a hard lockup related to commands like `ip`. if my assumption is just stupid let me know. if not i would further investigate the case, setup a test scenario and burn some time. what do you think? best regards, michael