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Re: IPv6 Information Wiki

  • From: Jeroen Massar
  • Date: Tue Sep 25 12:23:36 2007
  • Openpgp: id=333E7C23

[added bcc to [email protected] so that they can have a look at it too from
their end etc etc]

Robert E. Seastrom wrote:
> <[email protected]> writes:
>> ARIN has set up a wiki at to publish information
>> that will help ISPs, large and small in implementing IPv6 and migrating
>> to an IPv6 Internet.
> The unintentionally funny part of this is that the wiki hangs (the
> redirect to from
> works, but the subsequent page load does not)
> if you try to connect to it using IPv6.  Is this a subtle way of
> saying that I am not the intended audience?

Welcome to the wonderful world of "MTU issues" ;)

$ tracepath6
 1?: [LOCALHOST]                      pmtu 1500
 1:     asymm  2   1.320ms
 2:  2001:838:0:10::1                         asymm  3   3.404ms
 3:             asymm  5   4.666ms
 4:            asymm  5   8.504ms
 5:            asymm  6   8.662ms
 6:         asymm  8  15.684ms
 7:  2001:7f8:4::cb9:1                        asymm  9  15.809ms
 8:            17.379ms
 9:            23.015ms
10:           asymm  9  22.305ms pmtu 1480
10:            asymm  9  38.707ms
11:         asymm 10 148.863ms
12:  2001:440:1239:7000::2                    asymm 11 155.694ms
13:  no reply
14:  no reply
15:  no reply

Something is nicely filtering out ICMP there and clearly some hop is not
1480 ;) The fun really starts when you have a 1280 pMTU though.

Unfortunately ARIN doesn't have any traceroute6/tracepath6 tool
available online so that one can check the path back, which could show
where it goes wrong, as asymetric routes tend to be a big issue also ;)

I won't even show the other traceroute which has a 400ms+ path and
bounces from between nl -> uk -> us -> jp -> kr -> us -> arin and then
goes dead. IMHO ARIN should also definitely look at getting a good
transit provider, which would also help quite a bit with these kind of


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