Test your connectivity for World IPv6 Day

Fred Baker fred at cisco.com
Mon Jun 6 18:55:27 CEST 2011

On Jun 6, 2011, at 8:58 AM, 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.
> Servers that don't do that are open for PMTU problems. 

I understand where you're coming from, but I disagree. I think servers and the networks supporting them need to implement PMTU. The way to do that is (pick one) RFC 4821 in TCP or to manage to not block ICMPv6.

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