Re: Seeking Comcast Contact: need to troubleshoot packet loss and/or asymmetric routing issue between Comcast & Onvoy

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