Test your connectivity for World IPv6 Day

[Tassos Chatzithomaoglou]

I also support the idea of using everywhere a 1500 MTU and not only on W6D.
Even better, if measurements could be taken that show the networks with 
the most PMTUD issues (especially the ones with blocked ICMPv6), some 
people might get worried.
PMTUD is already a mess in IPv4, let's hope it won't become the same in 
IPv6.

If i had to choose between the following
1) X user experience caused by wrong configured network and wrong 
configured servers
2) Y user experience caused by right configured network and right 
configured servers
i would definitely go with the second option, even if X was better than 
Y temporarily.

--
Tassos


Eric Vyncke (evyncke) wrote on 06/06/2011 22:38:
> OTOH, if 'we' do not test IPv6 to 1500 bytes on Wednesday, then when could we try? Or do we really want to be stuck with 1280 byte for ever?
>
> Rémi, usually I am also advocating 1280 MTU on the server side, but, for W6D I would make an exception :-)
>
> -éric
>
>    
>> -----Original Message-----
>> From: ipv6-ops-bounces+evyncke=cisco.com at lists.cluenet.de [mailto:ipv6-ops-
>> bounces+evyncke=cisco.com at lists.cluenet.de] On Behalf Of Rémi Després
>> Sent: lundi 6 juin 2011 17:59
>> To: owens at nysernet.org
>> Cc: ipv6-ops at lists.cluenet.de; Jared Mauch
>> Subject: Re: Test your connectivity for World IPv6 Day
>>
>>
>> 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.
>>
>> RD
>>
>>
>>      
>>>> 	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.
>>>        
>
>
>