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I would suggest avoiding telnet. It is very insecure - any transmissions that occur are not encrypted, including things like passwords, so anyone who might be eavesdropping could find out your users' passwords and whatnot.
The best alternative is Secure Shell (ssh, or open-ssh). Mandrake may have installed it for you. If you installed any package called "sshd", then you already have it, and it's probably already running. Check out the OpenSSH homepage for documentation and stuff.
If you really want to use telnet, see if you can find "telnetd" on your installation discs, or if you have already installed it.
It's amazing how different two GNU/Linux distributions can be! On Slackware, telnetd is installed with the tcpip package. You would just uncomment the line for telnet in /etc/inetd.conf and send the HUP signal to inetd to restart it.
Please do not post the same thread in more than one forum. Picking the most relevant forum and posting it once there makes it easier for other members to help you and keeps the discussion all in one place.
here x.x.x.x is the IP address of the host/network from the network you want to access by telnet
write this in a script with a name say 'enable-telnet' and run in with ./enable-telnet
if permission related complexity arise, give proper permission to run it.