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)
Greets,
Jeroen
--
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.
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
Greets,
Jeroen
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