From: Zack Newman <zack@philomathiclife.com>
Subject: Re: Should the default MTU of wg(4) be 1408?
To: tech@openbsd.org
Date: Mon, 7 Sep 2026 16:23:29 -0600

> 1420 is the default for afaik all WireGuard implementations (including
> of course existing OpenBSD versions), I think diverging from this is
> likely to cause more problems than it'd solve

Yeah, that's definitely a good reason not to change. Apparently there
are WireGuard implementations that don't perform this padding. It's
not difficult to manually set the MTU to a more appropriate value
when you control all the peers, so I'll be sure to start doing that
even for my Linux devices.