[98318] 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 (Adrian Chadd)
Thu Aug 2 21:10:37 2007
Date: Fri, 3 Aug 2007 09:09:41 +0800
From: Adrian Chadd <adrian@creative.net.au>
To: Jim Shankland <nanog@shankland.org>
Cc: nanog@merit.edu
In-Reply-To: <46B2791B.90109@shankland.org>
Errors-To: owner-nanog@merit.edu
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
