[NCLUG] port monitorer

[Michael Dwyer]

> My firewall is blocking a needed port for running icq, and I'm having
> a hard time finding it.  I realize icq is *supposed* to use
> 2000-2020 tcp and 4000 udp, but those are open and it's still not
> working unless I open everything.  
> Do you guys know of a tool that will tell me which ports are being
> used so that I can run it w/ icq and see what icq's doing?  

I think you will find iptraf very useful in this case:

http://freshmeat.net/projects/iptraf

It does live connection tracking, port and ip identification, and runs a
DNS reverse-lookup daemon, so DNS lookups are non-blocking.
I find it to be very useful.