Test your connectivity for World IPv6 Day

Guillaume.Leclanche at swisscom.com Guillaume.Leclanche at swisscom.com
Mon Jun 6 18:44:00 CEST 2011

> -----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 Rémi Després
> Sent: Monday, June 06, 2011 5:59 PM
> 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.
> Servers that don't do that are open for PMTU problems.

We could imagine a reverse pmtud. A bit like TCP slow-start. Send small packets first, and grow until you get dropped, then reduce the PMTU to the last successful value :)

Of course, again, doesn't work for UDP unless implemented in the application layer.


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