Paul Millar paulm@astro.gla.ac.uk writes:
As a shot in the dark, have you got either ECN set, or a non-zero default window-scaling? Which kernel are you running?
cat /proc/sys/net/ipv4/tcp_ecn
This gives 1 for me (and I can access your pages).
cat /proc/sys/net/ipv4/tcp_default_win_scale
This is 0.
One more thing to try is tcptraceroute:
$ /usr/sbin/tcptraceroute www.astro.gla.ac.uk 80 Selected device eth0, address 157.181.170.74, port 41886 for outgoing packets Tracing the path to www.astro.gla.ac.uk (130.209.45.194) on TCP port 80, 30 hops max [...] 15 po3-0.warr-scr.ja.net (146.97.33.54) 45.120 ms 44.988 ms 45.036 ms 16 po2-0.glas-scr.ja.net (146.97.33.58) 49.367 ms 49.226 ms 49.186 ms 17 po0-0.glasgow-bar.ja.net (146.97.35.54) 49.115 ms 49.114 ms 49.057 ms 18 146.97.40.106 (146.97.40.106) 49.504 ms 50.188 ms 49.472 ms 19 130.209.2.117 (130.209.2.117) 49.783 ms 50.823 ms 49.629 ms 20 130.209.2.2 (130.209.2.2) 49.744 ms 49.599 ms 49.957 ms 21 terra.astro.gla.ac.uk (130.209.45.194) [open] 49.644 ms * *
The interesting part may be filtered, but it was able to contact terra at port 80.