Seeking Comcast Contact: need to troubleshoot packet loss and/or asymmetric routing issue between Comcast & Onvoy
nanog at shankland.org
Fri Aug 3 01:33:16 UTC 2007
Adrian Chadd wrote:
> 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?
Hmm; I've never actually heard of anybody doing PMTUD on non-TCP
traffic, though it's possible. Does anybody actually do it?
More information about the NANOG