On Sat, Jan 23, 1999 at 11:00:37PM +0000, Alan Cox wrote:
> There is one important bit of info missing - a tcpdump off the idle machine
> itself - ie does it think its outputting crap from the driver level or is
> this something odder
I haven't been able to clearly reproduce this yet. Most of the times, it
Just Doesn't Happen while tcpdump is running (or stops immediately, or
tcpdump doesn't display anything while the "activity" LED on the Ethernet
hub is flickering wildly), once I was able to see a kind of ACK storm on
the LAN that I don't really understand:
18:38:51.947133 0:0:c0:8c:6a:a9 0:e0:18:90:84:1b 0800 60: 193.174.156.65.1017 > 193.174.156.69.22: . ack 3622911635 win 4096 [tos 0x10]
18:38:51.947967 0:0:c0:8c:6a:a9 0:e0:18:90:84:1b 0800 60: 193.174.156.65.1017 > 193.174.156.69.22: . ack 1 win 4096 [tos 0x10]
18:38:51.948063 0:0:c0:8c:6a:a9 0:e0:18:90:84:1b 0800 60: 193.174.156.65.1017 > 193.174.156.69.22: . ack 1 win 4096 [tos 0x10]
18:38:51.949026 0:0:c0:8c:6a:a9 0:e0:18:90:84:1b 0800 60: 193.174.156.65.1017 > 193.174.156.69.22: . ack 1 win 4096 [tos 0x10]
18:38:51.949305 0:0:c0:8c:6a:a9 0:e0:18:90:84:1b 0800 60: 193.174.156.65.1017 > 193.174.156.69.22: . ack 1 win 4096 [tos 0x10]
18:38:51.949915 0:0:c0:8c:6a:a9 0:e0:18:90:84:1b 0800 60: 193.174.156.65.1017 > 193.174.156.69.22: . ack 1 win 4096 [tos 0x10]
This belongs to an ongoing SSH connection from the SCO Unix 3.2v4.2
machine (193.174.156.65) to the Linux 2.2.0-pre9 box (193.174.156.69),
and it stopped immediately upon sending a "ping" Linux -> SCO.
This was NOT the effect observed previously (the ACKs have been visible
on a third machine on the LAN, not as "corrupted packets").
I'll send more traces as soon as I'm able to reproduce the problem with
meaningful results.
gert
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Gert Doering - Munich, Germany gert@greenie.muc.de
fax: +49-89-35655025 gert.doering@physik.tu-muenchen.de
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