ICMPv6 rate limits breaking PMTUD (and traceroute) [Re: Comcast enables 6to4 relays]

Mikael Abrahamsson swmike at swm.pp.se
Thu Sep 2 05:18:35 UTC 2010

On Wed, 1 Sep 2010, Simon Leinen wrote:

> Your mentioning PMTU discovery issues in connection with 6to4 prompts me 
> to confess how our open 6to4 relay has probably contributed to the 
> perception of brokenness of 6to4 for quite a while *blush*.

We're also doing the same thing, 6to4 on 7600. Could you please share your 
configuration you're using on the tunnel interfaces? I thought 6to4 
traffic was only supposed to be 1280MTU?

Mikael Abrahamsson    email: swmike at swm.pp.se

More information about the NANOG mailing list