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Flavio Curti wrote:
> I'm trying to get my 2.4.25 linux to speak to the rest of the ipv6
> world. Most of the stuff works, except pmtu, which breaks HTTP POSTs,
> When I do a tracepath6 to my target host I get:
> curti@jamilah:~/$ sudo tracepath6 no-way.org
> 1?: [LOCALHOST] pmtu 1500
> 1: no reply
> 1: no reply
> 1: no reply
This more looks like a routing issue or that your upstream
interface has a wrong MTU.
jeroen@purgatory:~$ tracepath6 no-way.org
1?: [LOCALHOST] pmtu 1280
1: gw-20.ams-02.nl.sixxs.net 36.978ms
2: Amsterdam.core.ipv6.intouch.net 37.538ms
3: no reply
4: nl-amsix-core1.cyberlink.ch asymm 6 168.191ms
5: zhenge-gw1-fe00-13.cyberlink.ch asymm 7 174.521ms
6: tunnel-curti.cyberlink.ch asymm 8 233.862ms reached
Resume: pmtu 1280 hops 6 back 8
>
> I get the same when I tracepath6 to my default gateway.
> It does however work from another machine on the same LAN using
> a 2.4.23. It did also work when I used a 2.6.4 kernel (which I sadly
> can not use...). It did not work with 2.4.22 too.
As you mention LAN, I guess it is an ethernet and thus indeed MTU=1500.
<SNIP>
> Any Idea?
You could try lowering the MTU or verifying the routing tables.
> ifconfig:
> curti@jamilah:/usr/src/kernel-source-2.4.25/net$ sudo ifconfig eth0
> eth0 Link encap:Ethernet HWaddr 00:01:02:6B:50:94
> inet addr:192.168.168.53 Bcast:192.168.168.255 Mask:255.255.255.0
RFC1918 address...
> inet6 addr: fe80::201:2ff:fe6b:5094/64 Scope:Link
> inet6 addr: 2001:8a8:30:20:201:2ff:fe6b:5094/64 Scope:Global
> inet6 addr: 2001:8a8:30:20::53/64 Scope:Global
Global IPv6 address, sure that you are not tunneled somewhere?
jeroen@purgatory:~$ tracepath6 2001:8a8:30:20:201:2ff:fe6b:5094
1?: [LOCALHOST] pmtu 1280
1: gw-20.ams-02.nl.sixxs.net 36.919ms
2: Amsterdam.core.ipv6.intouch.net 37.623ms
3: no reply
4: nl-amsix-core1.cyberlink.ch asymm 6 174.657ms
5: zhenge-gw1-fe00-13.cyberlink.ch asymm 7 179.290ms
6: zhenge-fw1.cyberlink.ch asymm 8 177.764ms
7: 2001:8a8:30:20:201:2ff:fe6b:5094 asymm 9 183.583ms reached
Resume: pmtu 1280 hops 7 back 9
Routing backward to that site seems to go over a rather odd route.
Or for that matter, using ethernet only and no-asymm's:
jeroen@noc:~$ tracepath6 2001:8a8:30:20:201:2ff:fe6b:5094
1?: [LOCALHOST] pmtu 1500
1: fe0.breda.ipv6.concepts-ict.net 1. 84ms
2: no reply
3: nl-amsix-core1.cyberlink.ch 30.822ms
4: zhenge-gw1-fe00-13.cyberlink.ch 31.390ms
5: zhenge-fw1.cyberlink.ch 47.911ms
6: 2001:8a8:30:20:201:2ff:fe6b:5094 34.836ms reached
Resume: pmtu 1500 hops 6 back 6
Looks fine to me, or did you fix it in the meantime ? :)
> http://no-way.org/~fcu/
>
> Mach mit bei der Community-Bibliothek
> - In Zuerich/CH http://zurich.communitybooks.org/
> - Worldwide http://dlpdev.theps.net/ListOfExistingDlpNodes
How good is IPv6 connectivity btw in Zurich, as I will
be moving there next week, even though I haven't got a
place to stay.... yet... ;)
Greets,
Jeroen
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