My question was:
I have the problem, to detect a user, when he is running a special client,
for example ftp. It is not possible for me to change the programs or to
use something like a wrapper for the client. So i need something
like snoop. But this tool must run the whole day (via cron for example)
and has only to detect the special user and write this activity
to a logfile or syslogd.
Perhaps my question wasn't very exact. I was looking for an easy to use
tool to catch packets in a network, analyze it and makes entrys for
syslog or and send mail under special conditions. Well, of course i
don't want to work very much to install such a tool.
I think i have to work. :-}
But i get some good hints.
A very good hint is Network Flight Recorder (NFR) at www.nfr.com. It is
free and may be a very good tool. When i have time i will test it.
Other hints are to use standard tools and make some scripts:
This works on a UNIX box and is good to detect all connections and you can
see all used ports. But our problem is also using PCs.
snoop -d le0 -o /var/snoop.raw.out src myhost dst port 21:
This works also on a Sun. But our problem used also non standard ports.
So i have to check more than one port. But it is also possible to make
a script with this tool ...
I get also the hint to use a proxy server. But we are at an university
and it is not possible to force the people here to use it ...
I think this works only for a server. But i have to check the clients.
Well, i think, to check the net means much work to have a useful tool
running in a good way. In former times i was using interman, etherman
and packetman from ftp://ftp.cs.curtin.edu.au/pub/netman. Nice tools,
but it is not possible to create alarms or thing like this.
Shriman Gurung <SG@datcon.co.uk>
Steve Kay <email@example.com>
"Brian T. Wightman" <firstname.lastname@example.org>
"Mark Sherman [ Y2k Consultant ]" <email@example.com>
"Robert G. Ferrell" <firstname.lastname@example.org>
Seth Rothenberg <SROTHENB@montefiore.org>
Dave McFerren <email@example.com>
-- Detlev | Institut fuer Mikroelektronische Systeme, Uni Hannover Habicht | D-30167 Hannover +49 511 7624992 firstname.lastname@example.org --------+-------- Handy +49 172 5415752 ---------------------------
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