1.3.64: TCP bug?

Ulrich Windl (Ulrich.Windl@rz.uni-regensburg.de)
Fri, 16 Feb 1996 14:45:16 +0100


I'm not sure whether it may be an indication that there's a bug in
the TCP code, but anyway:

With 1.3.62 I had a long (=slow) FTP session over the Atlantic. After
a while transfer had stopped, although I used the traceroute trick
(which is still necessary for FTP not to die). After losing my
patience, I hit ^C to abort the transfer. The resulting message was
that the foreign server has closed the connection due to timeout (and
not aborted the transfer due to ^C). This has happened to me several
times.

When trying a faster (=shorter distance) FTP test with 1.3.64, the
connection seemed to hang for a while. netstat showed the state as
"SYS_SENT". After a while the connection was aborted. I don't know if
this is repeatable, but I think there are some bugs left in the
kernel.

Of course it could also be my rather old FTP client (Slackware 2.0).

Short-distance FTP seems to work fine. Maybe it's a problem of
timers, windows, ACK, etc.

Ulrich
------------
Ulrich Windl Klinikum der Universitaet Regensburg
Rechenzentrum DV-med Franz-Josef-Strauss-Allee 11
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The French government had announced that one, or maybe two, nuclear
tests are necessary before further nuclear explosions can be simulated
on computers. I don't know which is the worst: French computers, French
mathematicans, or French politicians.