NetCat

Redirect ports.

This one redirect port 24 to port 22.

24 stream tcp nowait nobody /usr/sbin/tcpd /bin/nc 192.168.1.1 22

This one redirects port 6000(x11) to port 25

x11 stream tcp nowait root /usr/local/bin/nc nc -n -w 3 127.0.0.1 25

Start a chat

host computer - 10.0.0.1

 nc -l 8001

remote computer - 10.0.0.2

 nc 10.0.0.1 8001

and then start typing