I'm teaching firewalls on Linux.
I'm looking for a program that can take two arguments:
--port portnumber [listening port number]
--tcp or --udp [choose the protocol]
Several instances can be running on different port.
Clients can connect through telnet and the server is echoing telnet
This program is aimed for students. They can add some iptables rules
on machine and test if they still can access their servers from
Yes, I'm too lazy to write one myself.