[75825] in North American Network Operators' Group
Re: MTU (was Re: ULA and RIR cost-recovery)
daemon@ATHENA.MIT.EDU (Bill Owens)
Thu Nov 25 09:11:23 2004
Date: Thu, 25 Nov 2004 09:11:07 -0500
From: Bill Owens <owens@nysernet.org>
To: Alex Bligh <alex@alex.org.uk>
Cc: Michael.Dillon@radianz.com, NANOG@merit.edu
Mail-Followup-To: Alex Bligh <alex@alex.org.uk>,
Michael.Dillon@radianz.com, NANOG@merit.edu
In-Reply-To: <C3CB752C22AE3E56A205689C@[192.168.100.25]>
Errors-To: owner-nanog-outgoing@merit.edu
On Thu, Nov 25, 2004 at 02:05:25PM +0000, Alex Bligh wrote:
> Given how pMTUd works, this speculation should be relatively easy to test
> (take end point on >1500 byte MTU, run traceroute with appropriate MTU to
> various points and see where fragmentation required comes back). Of course
> I'd have tried this myself before posting, except, urm, I can't find a
> single machine I have root on that I can get more than a hop or two from
> without running into 1500 byte (or less) MTU.
I happen to have such a machine and an application that specifically tests hop-by-hop MTUs, if there are any specific destinations you'd like checked. It has 9k to the R&E world, and 4470 to Qwest.
Bill.
