[98307] in North American Network Operators' Group
Re: Seeking Comcast Contact: need to troubleshoot packet loss and/or asymmetric routing issue between Comcast & Onvoy
daemon@ATHENA.MIT.EDU (William Herrin)
Thu Aug 2 10:10:38 2007
Date: Thu, 2 Aug 2007 10:09:38 -0400
From: "William Herrin" <herrin-nanog@dirtside.com>
To: "Craig D. Rice" <cdr@stolaf.edu>
Cc: nanog@merit.edu
In-Reply-To: <46B1DC65.7060405@stolaf.edu>
Errors-To: owner-nanog@merit.edu
On 8/2/07, Craig D. Rice <cdr@stolaf.edu> wrote:
> We have already attempted the usual troubleshooting and have eliminated user
> problems, computer problems, server problems, cable modem problems, and
> Linksys router problems. Traceroutes have been somewhat inconclusive since
> Onvoy blocks ICMP within its network.
Craig,
This rings a bell. Do they block the mandatory ICMP
fragmentation-needed messages?
Try this: on your web server, reduce the MTU from 1500 bytes to 1400
bytes and see if the affected comcast users can now access your web
server.
Regards,
Bill Herrin
--
William D. Herrin herrin@dirtside.com bill@herrin.us
3005 Crane Dr. Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004
