Fixing MTU issues - would somebody like a 'tracepath6 from 47 different ISPs'? (Was: Test your connectivity for World IPv6 Day)

[Guillaume.Leclanche at swisscom.com]

> -----Original Message-----
> From: ipv6-ops-
> bounces+guillaume.leclanche=swisscom.com at lists.cluenet.de [mailto:ipv6-
> ops-bounces+guillaume.leclanche=swisscom.com at lists.cluenet.de] On
> Behalf Of Andrew Yourtchenko
> Sent: Tuesday, June 07, 2011 11:58 AM
> To: Jeroen Massar
> Cc: Rémi Després; Eric Vyncke (evyncke); ipv6-ops at lists.cluenet.de;
> Tore Anderson
> Subject: Re: Fixing MTU issues - would somebody like a 'tracepath6 from
> 47 different ISPs'? (Was: Test your connectivity for World IPv6 Day)
> 
> On Tue, Jun 7, 2011 at 11:46 AM, Jeroen Massar <jeroen at unfix.org>
> wrote:
> > First an insult: Folks who think that blocking ICMP is 'smart' and
> > 'secure' please upgrade your brain and fix your local issue and at
> least
> > don't block ICMP Packet Too Big, it really is needed for a proper
> > functioning of the Internet.
> 
> +1.
> 
> Though sometimes it is a bit more complicated than just ICMP being
> blocked.
> (speaking from personal experience with tracking down s/w bugs).

Yes, for example when a router in the middle sends the packet too big with a link-local address as source.

Guillaume