Test UDP Ports

[ml at bortal.de]

Hello List,

in order to do some firewall testing i would like to simulate services
(loads of ports).
So far it works well with TCP using netcat, nmap and some bash script.
It works like a charm.

I ran into problems doing the same with UDP. As soon as i fire up my
nmap UDP scan my netcat dies and as a result i get a closed port.

How i start it up:
---------------------
Server: netcat -u -l -p 123
Client: nmap -p 123 -P0 -sU ServerHost


Any idea how i can tell netcat to stay alive?


Thanks, Mario