[added bcc to ops@arin.net so that they can have a look at it too from their end etc etc] Robert E. Seastrom wrote:
<michael.dillon@bt.com> writes:
ARIN has set up a wiki at http://www.getipv6.info 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 http://www.getipv6.info/index.php/Main_Page from http://www.getipv6.info 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 www.getipv6.info 1?: [LOCALHOST] pmtu 1500 1: ge-1-3-0.breda.ipv6.concepts-ict.net asymm 2 1.320ms 2: 2001:838:0:10::1 asymm 3 3.404ms 3: ge6-2-0.br0.ams3.nl.gbxs.net asymm 5 4.666ms 4: so-0-0-0.bb1.bru2.be.gbxs.net asymm 5 8.504ms 5: ge-0-3-0.bb1.bru1.be.gbxs.net asymm 6 8.662ms 6: ge-6-0-0-32.bb1.bru2.be.gbxs.net asymm 8 15.684ms 7: 2001:7f8:4::cb9:1 asymm 9 15.809ms 8: so-1-0-0.dus11.ip6.tiscali.net 17.379ms 9: so-0-0-0.ham10.ip6.tiscali.net 23.015ms 10: so-0-0-0.ham10.ip6.tiscali.net asymm 9 22.305ms pmtu 1480 10: sl-bb1v6-bru-t-7.sprintv6.net asymm 9 38.707ms 11: sl-bb1v6-rly-t-1001.sprintv6.net 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 problems. Greets, Jeroen