Linux 2.2.14 TCP problem ??

From: Rob van Nieuwkerk (robn@verdi.et.tudelft.nl)
Date: Wed Jan 05 2000 - 15:41:05 EST


Hi,

I just upgraded my machine from 2.2.7-ac4 to 2.2.14 and I noticed
that while clicking around on ftp://ftp.applix.com/pub/applixware/
in netscape that it can get "stuck" on some ACK war between my
machine and ftp.applix.com. I've never seen it happen before
(but I didn't visit the site before, so maybe the problem is
there !). There are some sockets in FIN_WAIT_[12] while it
happens. Netscape will get unstuck by pressing "stop" but the
ACK fight continues.

It's very easy (on my machine) to reproduce: just visit the
FTP site with netscape and do some cd or read a file.

Sorry, I don't have the time now to investigate it more.
Below is some tcpdump data from when it was going on.

        Greetings,
        Rob van Nieuwkerk

SysInfo:
-------
- well maintained Red Hat 5.2
- Intel Pentium 133 / 64 MB
- Netscape 4.7
- 2.2.14 kernel

        .
        .
21:25:43.268060 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.268166 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
21:25:43.268392 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.268479 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
21:25:43.297920 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.298029 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
21:25:43.367915 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.368039 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
21:25:43.377992 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.378099 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
21:25:43.437929 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.438047 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
21:25:43.488107 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.488215 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
21:25:43.488444 applix100.applix.com.ftp > verdi.et.tudelft.nl.1465: . ack 1146 win 9112 (DF) [tos 0x10]
21:25:43.488530 verdi.et.tudelft.nl.1465 > applix100.applix.com.ftp: . ack 3026 win 32696 (DF) [tos 0x10]
        .
        .

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