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)
--
jeroen(_at_)purgatory:~$ 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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