[155940] in North American Network Operators' Group
Re: MTU mismatch on one link
daemon@ATHENA.MIT.EDU (Dan White)
Fri Aug 31 10:28:45 2012
Date: Fri, 31 Aug 2012 09:28:44 -0500
From: Dan White <dwhite@olp.net>
To: Tom Taylor <tom.taylor.stds@gmail.com>
In-Reply-To: <5040BC58.7060808@gmail.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 08/31/12 09:30 -0400, Tom Taylor wrote:
>Has anyone run into a situation where the MTU at one end of a link
>was configured differently from the MTU at the other end? How did you
>catch it?
>
>In general, do you see any need for a debugging tool to be
>standardized to find such mismatches?
Performing a ping with a large packet size '-s', and/or with packet
fragmentation turned off '-M do' have been our primary tools for finding
MTU (layer 2 and layer 3) mismatches.
--
Dan White
