Test your connectivity for World IPv6 Day

Ignatios Souvatzis ignatios at cs.uni-bonn.de
Tue Jun 7 09:39:51 CEST 2011

On Mon, Jun 06, 2011 at 09:41:39PM +0200, Daniel Roesen wrote:
> On Mon, Jun 06, 2011 at 05:58:43PM +0200, Rémi Després wrote:
> > Unless there are good reasons to know that a longer PMTU applies to all
> > their connections, all servers SHOULD send IPv6 packets to off-link
> > destinations with 1280 octets as default PMTU.
> So you advocate making 1280 effectively the maximum MTU, not the minimum?
> I'm with Fred here. Fix broken paths, not work around the problems.

That are two different things.

1280 octets is the minimum MTU a link SHOULD have (IIRC - or is it MUST?)

The result is, a machine can work around broken incoming ICMPv6 by
using 1280 octets as it outgoing MTU.


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