Messages in this thread | | | Date | Sun, 10 Dec 2006 14:46:35 +0100 (MET) | From | Jan Engelhardt <> | Subject | Window scaling problem? |
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Hello,
for some reason unknown to me, some TCP connections just hang or get reset after some kilobytes have been transferred. I suppose it is a router with broken window scaling, but I can not say for sure from the tcpdump logs.
Action: scp ahn.hopto.org:8megabytefile /home/jengelh/ also affects interactive ssh sessions. Result: After a few transferred kilobytes -- I rather suspect "a few seconds" -- either spuriously disconnects with a "Connection reset by peer" or just hangs. Expected result: Continue operation. Logs: http://jengelh.hopto.org/tcp/atw.txt sender side http://jengelh.hopto.org/tcp/ahn.txt receiver side http://jengelh.hopto.org/tcp/trace.txt glimpse of topology
(There is a TCP FIN/RST at the end of atw.txt, which is when I hit Ctrl+C to stop the (hung) scp.)
What puzzles me is that line 230 of ahn.txt shows a RST, while there is no TCP RST sent in atw.txt. On top of that, the "R 889945325:889945325(0)" looks quite out of order.
When setting up a VPN over UDP tunnel (using vpnc) to our exit node, connections seem to be fine. I hence suppose 10.10.96.1 to be the culprit.
If anyone could take a look, I'd be grateful. Kernel currently running is 2.6.18.5, but I have seen this with 2.6.17 I was running two months ago too, so I do not suspect a kernel bug.
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