Test your connectivity for World IPv6 Day

Rémi Després remi.despres at free.fr
Mon Jun 6 22:29:02 CEST 2011

Le 6 juin 2011 à 18:44, <Guillaume.Leclanche at swisscom.com> a écrit :

>> -----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.

Then the safe approach for the short term is clear (IMHO).


> Guillaume

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