Subject: Re: PMTUD blackhole detection
To: Michael Richardson <email@example.com>
From: None <firstname.lastname@example.org>
Date: 05/07/2001 20:40:18
> > if you know that PMTUD is failing for particular paths, you
> > should be able to set a lower path MTU value by using route(8)
> > (use -mtu keyword).
> This doesn't work for, e.g. web servers with random connects from all
>over. Having received one connection from a client, the odds of a getting a
>second one is high, and there may in fact be 4+ concurrent ones already.
we may be able to go through tcb table and mark all the tcp
connections between the same address pair as "PMTUD broken". however,
i don't really like this since PMTUD breakage detection is way too
unreliable. if we have a reliable way to detect PMTUD breakge, "mark
all connection" approach looks fine for me.