Mailinglist Archive: opensuse-buildservice (142 mails)

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[opensuse-buildservice] Re: novel/attachmategroup server admin here?
On Thu 01 Aug 2013 05:48:46 PM CDT, Ruediger Meier wrote:


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 (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 >/dev/null
(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
1?: [LOCALHOST] 0.030ms pmtu 1500
1: 0.359ms
1: 0.273ms
2: 0.318ms
pmtu 1456 2: 2a01:170:0:10::1
30.847ms 3: 2a01:170:2:1:1::4
31.403ms 4:
32.352ms asymm 5 5: 32.359ms asymm
6 6: 40.413ms
7: 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 >/dev/null

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 is broken. Maybe they block incomming icmp6
("package too big") or whatever.

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

A bug has been opened (not sure if you can see it?)

Cheers Malcolm °¿° (Linux Counter #276890)
openSUSE 12.3 (x86_64) Kernel 3.7.10-1.16-desktop
up 21:22, 3 users, load average: 0.16, 0.52, 0.63
CPU AMD E2-1800@1.70GHz | GPU Radeon HD 7340

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