[107030] in North American Network Operators' Group
Re: IP Fragmentation
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Wed Aug 20 14:04:18 2008
To: Glen Kent <glen.kent@gmail.com>
In-Reply-To: Your message of "Wed, 20 Aug 2008 21:43:44 +0530."
<92c950310808200913s6e8bbab8pbc30492eebfc79bf@mail.gmail.com>
From: Valdis.Kletnieks@vt.edu
Date: Wed, 20 Aug 2008 14:04:13 -0400
Cc: OPS Gurus <nanog@merit.edu>
Errors-To: nanog-bounces@nanog.org
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On Wed, 20 Aug 2008 21:43:44 +0530, Glen Kent said:
> Do transit routers in the wild actually get to do IP fragmentation
> these days? I was wondering if routers actually do it or not, because
> the source usually discovers the path MTU and sends its data with the
> least supported MTU. Is this true?
Hypothetically true. Unfortunately, enough places do bozo firewalling and drop
the ICMP Frag Needed packets to severely limit the utility of PMTU Discovery.
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