Test your connectivity for World IPv6 Day

Rémi Després remi.despres at free.fr
Mon Jun 6 17:58:43 CEST 2011

Le 6 juin 2011 à 00:00, Bill Owens a écrit :

> On Fri, Jun 03, 2011 at 07:53:24AM -0400, Jared Mauch wrote:
>> On Thu, Jun 02, 2011 at 11:04:35AM +0200, Daniel Roesen wrote:
>>> On Wed, Jun 01, 2011 at 09:53:55AM -0700, Seth Mattinen wrote:
>>>> Both AfriNIC and ipv6.juniper.net are both working for me from work.
>>>> traceroute to ipv6.juniper.net (2620:103:c003::10), 30 hops max, 40 byte
>>>> packets
>>> The problem with ipv6.juniper.net is a PMTUD problem, not general
>>> reachability problem...

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've not had luck reaching anyone there.  If someone from Juniper
>> is here please send me a note in private.
> Good luck with that. We discovered the PMTUD problem in February, told them about it in March. . . and April. . . and it's still broken.
> Anyway, if you have a FreeBSD or OS X box with non-tunneled IPv6 connectivity, you can do the tests yourself:  http://www.wand.net.nz/scamper/pmtud 
> Bill.

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