Comment # 3 on bug 1053231 from Aleksa Sarai

(In reply to Valentin Rothberg from comment #1)
> Do you know if there's an open issue or PR for upstream? I checked quickly,
> but couldn't find something that matches.

The reporter mentioned this bug on IRC, and I identified it as an upstream
regression (we don't have any iptables patches, and the bug occurs due to
iptables rules AFAICS). I didn't submit an issue upstream yet, but I should do
that soon. The main thing stopping me from doing so is that I cannot reproduce
the issue locally at the moment -- meaning that bisecting is going to be a
nightmare.