On Fri, Sep 01, 2006 at 01:25:19PM +0200, Jeroen Massar wrote:
> Tim Chown wrote:
> >Hi,
> >
> >While I can establish a fast telnet session to port 80:
> >
> >$ telnet www.ietf.org 80
> >Trying 2001:503:c779:b::d1ad:35b4...
> >Connected to www.ietf.org.
> >Escape character is '^]'.
> >
> >Attempting to browse via MSIE leads to timeouts.
> >
> >Connecting explictly to http://209.173.53.180 to assure IPv4 works fine.
>
> "telnet -4 www.ietf.org" should do that trick too, but notez bien:
>
> www.ietf.org A 209.173.53.180
> www.ietf.org A 209.173.57.180
> www.ietf.org AAAA 2001:503:C779:B:0:0:D1AD:35B4
>
> We don't know if those are 3 different boxes, or simply 1 box with
> multiple links/addresses. As IPv4 traceroutes die off one can't tell
> what really is happening behind AT&T (at least from my perspective).
> Looking at routeviews it seems that both IPv4 /24's have somewhat
> different ASPaths, going over different upstreams.
>
> >Perhaps some Apache issue or PMTU issue?
>
> Most likely PMTU.
>
> >Anyone else experiencing this?
>
> Works from boxes behind my home DSL line (purgatory.unfix.org) and from
> my work box, which is behind SWITCH (2001:620::/32). Tested with telnet,
> MSIE and firefox. See below for traces from the DSL.
>
> Can you try tracepath6, which is available afaik only on Linux boxes
> though, to show the MTU path? (iputils-tracepath is the deb package)
>
> --
> [EMAIL PROTECTED]:~$ tracepath6 www.ietf.org
> 1?: [LOCALHOST] pmtu 1480
> 1: 2001:7b8:5:10:74::1 32.572ms
> 2: i49.ge-0-1-0.jun1.kelvin.ipv6.network.bit.nl asymm 3 33.623ms
> 3: jun1.telecity.ipv6.network.bit.nl asymm 4 34.609ms
> 4: zpr2.amt.cw.net asymm 5 35.522ms
> 5: so-5-2-0-dcr1.amd.cw.net asymm 6 34.597ms
> 6: as0-dcr2.amd.cw.net asymm 7 35.611ms
> 7: so-4-0-0-dcr1.tsd.cw.net asymm 8 41.612ms
> 8: so-1-0-0-zcr1.lnt.cw.net asymm 9 41.507ms
> 9: 2001:7f8:4::31f9:1 asymm 8 137.537ms
> 10: v3323-mpd.cr1.ewr1.us.occaid.net asymm 7 141.670ms
> 11: ge-0-1-0.cr1.iad1.us.occaid.net asymm 7 146.538ms
> 12: unknown.occaid.net asymm 8 152.466ms
>
> And then no responses, thus most likely filtered for this kind of trace.
So I'm on RedHat, have tracepath6 installed (not used before, thanks for
the pointer :) and I see in comparison:
$ /usr/sbin/tracepath6 www.ietf.org
1?: [LOCALHOST] pmtu 1500
1: 2001:630:d0:f102::2 1.191ms
2: zaphod.6core.ecs.soton.ac.uk 1. 93ms
3: ford.6core.ecs.soton.ac.uk 1.915ms
4: 2001:630:c1:100::1 2. 66ms
5: 2001:630:c1:10::1 2.353ms
6: no reply
7: no reply
8: no reply
9: po9-0.cosh-scr.ja.net 8.440ms
10: po2-0.lond-scr.ja.net 5.273ms
11: po0-0.lond-scr4.ja.net 6.319ms
12: gi0-1.lond-isr4.ja.net 6.238ms
13: 2001:630:0:10::52 8.138ms
14: ge-2-24.r01.londen03.uk.bb.gin.ntt.net 11.163ms
15: xe-0-1-0.r23.londen03.uk.bb.gin.ntt.net asymm 16 11.525ms
16: xe-0-2-0.r22.londen03.uk.bb.gin.ntt.net asymm 17 15.225ms
17: 1d-uk6x.ipv6.btexact.com 11.292ms
18: 52.ge0-0.cr2.lhr1.uk.occaid.net 13.643ms
19: 52.ge0-0.cr2.lhr1.uk.occaid.net asymm 18 16. 63ms pmtu 1480
19: v3323-mpd.cr1.ewr1.us.occaid.net 88.237ms
20: ge-0-1-0.cr1.iad1.us.occaid.net 92.623ms
21: unknown.occaid.net 101.267ms
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 1480
Resume: pmtu 1480
Hmm, 1500 vs 1480.
> But traceroute6 works fully:
>
> traceroute to www.ietf.org (2001:503:c779:b::d1ad:35b4) from
> 2001:7b8:20d:0:290:27ff:fe24:c19f, 30 hops max, 24 byte packets
> 1 2001:7b8:5:10:74::1 (2001:7b8:5:10:74::1) 13.874 ms 9.645 ms
> 10.963 ms
> 2 i49.ge-0-1-0.jun1.kelvin.ipv6.network.bit.nl
> (2001:7b8:3:31:290:6900:31c6:d81f) 9.943 ms 15.581 ms 14.958 ms
> 3 jun1.telecity.ipv6.network.bit.nl (2001:7b8::290:6900:1c6:7c1f)
> 16.953 ms * 10.6 ms
> 4 zpr2.amt.cw.net (2001:7f8:1::a500:1273:1) 10.972 ms 11.501 ms
> 10.99 ms
> 5 so-5-2-0-dcr1.amd.cw.net (2001:5000:0:12::1) 11.987 ms 11.614 ms
> 11.986 ms
> 6 as0-dcr2.amd.cw.net (2001:5000:0:11::2) 11.989 ms 11.569 ms
> 10.989 ms
> 7 so-4-0-0-dcr1.tsd.cw.net (2001:5000:0:20::2) 17.988 ms 17.589 ms
> 17.989 ms
> 8 so-1-0-0-zcr1.lnt.cw.net (2001:5000:0:61::2) 21.988 ms 17.505 ms
> 17.988 ms
> 9 2001:7f8:4::31f9:1 (2001:7f8:4::31f9:1) 112.99 ms 112.727 ms
> 113.984 ms
> 10 v3323-mpd.cr1.ewr1.us.occaid.net (2001:4830:fe:1010::2) 111.988 ms
> 112.501 ms 112.991 ms
> 11 ge-0-1-0.cr1.iad1.us.occaid.net (2001:4830:ff:f150::2) 117.969 ms
> 118.47 ms 118.997 ms
> 12 unknown.occaid.net (2001:4830:e6:d::2) 121.972 ms 122.48 ms
> 121.978 ms
> 13 stsc350a-eth3c0.va.neustar.com (2610:a0:c779::fe) 124.004 ms
> 124.44 ms 124.975 ms
> 14 2001:503:c779:b::d1ad:35b4 (2001:503:c779:b::d1ad:35b4) 123.992 ms
> 122.722 ms 124.007 ms
Likewise:
$ /usr/sbin/traceroute6 www.ietf.org
traceroute to www.ietf.org (2001:503:c779:b::d1ad:35b4) from
2001:630:d0:f102:230:48ff:fe23:58df, 30 hops max, 16 byte packets
1 2001:630:d0:f102::2 (2001:630:d0:f102::2) 1.883 ms 2.719 ms 4.513 ms
2 zaphod.6core.ecs.soton.ac.uk (2001:630:d0:f001::1) 4.462 ms 2.485 ms
2.886 ms
3 ford.6core.ecs.soton.ac.uk (2001:630:d0:f000::1) 3.444 ms 0.648 ms 0.64
ms
4 2001:630:c1:100::1 (2001:630:c1:100::1) 1.235 ms 1.104 ms 0.962 ms
5 2001:630:c1:10::1 (2001:630:c1:10::1) 1.21 ms 1.138 ms 1.186 ms
6 * * *
7 2001:630:c1::1 (2001:630:c1::1) 4.982 ms 2.891 ms 2.138 ms
8 2001:630:c1::1 (2001:630:c1::1) 2.562 ms 2.189 ms 2.662 ms
9 po9-0.cosh-scr.ja.net (2001:630:0:10::85) 6.928 ms 5.495 ms 2.477 ms
10 po2-0.lond-scr.ja.net (2001:630:0:10::29) 4.459 ms 4.32 ms 4.166 ms
11 po0-0.lond-scr4.ja.net (2001:630:0:10::56) 4.739 ms 4.51 ms 4.492 ms
12 gi0-1.lond-isr4.ja.net (2001:630:0:10::12a) 4.739 ms 4.384 ms 4.721 ms
13 2001:630:0:10::52 (2001:630:0:10::52) 6.307 ms 5.528 ms 4.987 ms
14 ge-2-24.r01.londen03.uk.bb.gin.ntt.net (2001:728:1c00:5000::9) 5.8 ms
5.663 ms 6.625 ms
15 xe-0-1-0.r23.londen03.uk.bb.gin.ntt.net (2001:728:0:2000::21) 6.66 ms
6.656 ms 6.885 ms
16 xe-0-2-0.r22.londen03.uk.bb.gin.ntt.net (2001:418:0:2000::1c9) 6.114 ms
6.369 ms 6.042 ms
17 1d-uk6x.ipv6.btexact.com (2001:7f8:2:1::1d) 7.595 ms 6.708 ms 6.703 ms
18 52.ge0-0.cr2.lhr1.uk.occaid.net (2001:4830:fe:1100::2) 11.047 ms 6.983 ms
8.301 ms
19 v3323-mpd.cr1.ewr1.us.occaid.net (2001:4830:fe:1010::2) 81.249 ms 82.56
ms 80.423 ms
20 ge-0-1-0.cr1.iad1.us.occaid.net (2001:4830:ff:f150::2) 87.17 ms 87.134 ms
85.887 ms
21 unknown.occaid.net (2001:4830:e6:d::2) 90.419 ms 90.738 ms 91.462 ms
22 stsc350a-eth3c0.va.neustar.com (2610:a0:c779::fe) 92.066 ms 92.392 ms
92.732 ms
23 2001:503:c779:b::d1ad:35b4 (2001:503:c779:b::d1ad:35b4) 91.799 ms 92.663
ms 90.864 ms
--
Tim/::1
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