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

On Thu, Aug 02, 2007, Jim Shankland wrote:

Linux has a nifty iptables option (clamp-mss-to-pmtu) to rewrite the MSS in TCP SYN packets when forwarding a packet onto a link with a lower MTU than the MSS in the packet. Works like a charm. If every packet forwarding device on the Internet did this, PMTUD would not be needed. As is, PMTUD is simply broken, due to widespread firewall misconfiguration. As in so many other cases of Internet misbehavior, you can avoid being part of the problem, but you can't be the solution.

.. non-TCP traffic? Adrian