On Thu 01 Aug 2013 05:48:46 PM CDT, Ruediger Meier wrote:

Hi,

I had and still have often problems to use opensuse web services via IPv6. I think that opensuse/novell servers or their routers have problems with pmtu detection. Is there any admin on this list who could help me to debug this?

For example I always timeout when connecting to https://esp.attachmategroup.com (which is needed to login bugzilla) (ping6 works)

My client machine has this IP 2a01:170:1093::28 When I try this I don't get any answer: $ curl -v -6 https://esp.attachmategroup.com/ >/dev/null <timeout> (I get some ack packages back but none with real load)

But it works after doing a tracepath (i.e. after I "push" my MTU to the server) $ tracepath6 esp.attachmategroup.com 1?: [LOCALHOST] 0.030ms pmtu 1500 1: skylla.ga-group.nl 0.359ms 1: skylla.ga-group.nl 0.273ms 2: skylla.ga-group.nl 0.318ms pmtu 1456 2: 2a01:170:0:10::1 30.847ms 3: 2a01:170:2:1:1::4 31.403ms 4: TAL.FRA-12-eth012-612.v6.lambdanet.net 32.352ms asymm 5 5: FRA-1-eth1-104.v6.lambdanet.net 32.359ms asymm 6 6: 6b1.fft4.alter.net 40.413ms 7: 2.gr-1-1-0.GW66.LAX9.ALTER.NET 194.260ms asymm 11 8: 2600:806:31f::6 215.202ms asymm 12 9: 2600:806:31f::6 206.308ms asymm 12 10: 2600:806:310::1 204.252ms asymm 13 11: 2600:806:310::106 204.402ms reached Resume: pmtu 1456 hops 11 back 51

$ curl -v -6 https://esp.attachmategroup.com/ >/dev/null <success>

So it's surely a problem with path MTU detection (pmtu). Either their servers don't invoke such pmtu detection or it simply does not work from their side. There is a small chance that my ISP is the problem but it's more likely that attachmategroup.com is broken. Maybe they block incomming icmp6 ("package too big") or whatever.

Who can help me or bring this to novel? webmaster@novel.com has not done anything since 2 weeks.

cu, Rudi Hi A bug has been opened (not sure if you can see it?) https://bugzilla.novell.com/show_bug.cgi?id=832909

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