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:35B4We 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@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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