[107031] in North American Network Operators' Group
Re: IP Fragmentation
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Wed Aug 20 14:09:46 2008
From: Iljitsch van Beijnum <iljitsch@muada.com>
To: Valdis.Kletnieks@vt.edu
In-Reply-To: <20580.1219255453@turing-police.cc.vt.edu>
Date: Wed, 20 Aug 2008 20:09:32 +0200
Cc: OPS Gurus <nanog@merit.edu>
Errors-To: nanog-bounces@nanog.org
On 20 aug 2008, at 20:04, Valdis.Kletnieks@vt.edu wrote:
> Hypothetically true. Unfortunately, enough places do bozo
> firewalling and drop
> the ICMP Frag Needed packets to severely limit the utility of PMTU
> Discovery.
Yet all OSes have it enabled and there is no fallback to fragmentation
in PMTUD: if your system doesn't get the ICMP messages, your session
is dead in the water.
