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Transfers interrupted when uploading



Dear all, 

I have a very  nasty problem: I can't upload files from my machine.

I'm connected to the Internet via an ordinary  dialup (ppp). All goes
smooth, I can navigate and  work remotely via telnet or ssh.
I'm running a potato 2.2r0 on a laptop.

Problems arise when I try to serve files by either uploading them directly
via ssh or ftp towards some remote, or by connecting to a remote and try
to
retrieve files from my machine.

What happens is that after the first  few Kb's, the  transfer hangs and I
can
only disconnect by hanging up.  Note that SMALL, ascii tranfers end
succesfully.

This is an example of what /var/log/messages tells me in one case where
I was trying from a
remote to log into my machine and get files via ftp:

--------------------------------------
Jun 24 19:25:46 paperoga wu-ftpd[294]: FTP LOGIN FROM
pippo.pluto.paperoga.it
[xxx.xxx.xxx.xxx] pippo
Jun 24 19:29:05 paperoga pppd[254]: No response to 4 echo-requests
Jun 24 19:29:05 paperoga pppd[254]: Serial link appears to be
disconnected.
Jun 24 19:29:35 paperoga pppd[254]: Connection terminated.
Jun 24 19:29:35 paperoga pppd[254]: Connect time 9.2 minutes.
Jun 24 19:29:35 paperoga pppd[254]: Sent 56535 bytes, received 45908
bytes.
Jun 24 19:29:36 paperoga pppd[254]: Hangup (SIGHUP)
Jun 24 19:29:36 paperoga pppd[254]: Exit.
--------------------------------------

an example of the progress of an  ftp session is:

150 Opening BINARY mode data connection for celle.tar.gz
(xxx.yyy.zzz.kkk,1100).
################################################################
(64x1024 and then serial line hangs)

Analogously an ssh session hangs after:
celle.tar.gz         100% |*****************************|   155 KB
00:00


Does anybody have any clue of what is happening to my transfers?
(are there other logs which may tell me more?)
Do I have to give away my monster-laptop to my newborn to amuse
himself?....

Thanks  very much.
Alberto

-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/
Alberto Bigazzi, PhD. 
Research Associate,          
Dept. of Mathematics,       
Politecnico di Milano,       
Piazza Leonardo da Vinci 32,
20133 Milano (ITALY)       
-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/
Phone: +39-02-2399 4508
Fax:   +39-02-2399 4568
email: alberto.bigazzi@mate.polimi.it
http://www1.mate.polimi.it/~albbig
-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/-/





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