I'd recommend that you not use telnet over the internet. It does not encrypt the session and all passwords are passed in clear text. Therefore, it is not at all secure.
Most security recommendations prefer the use of ssh (secure shell). It is included as a server and client on all modern Linux distributions. Further, it also can encrypt X sessions making them secure over the internet too.
For the Win2K machine, there are a number of clients (open source and commercial) available that use and support ssh. The two open source ones I have used are putty
as a terminal and Winscp2
as a file transfer tool. Both seem to work ok.
As for configuration of ssh on your distribution, I do not use Suse so I won't offer a suggestion. But since Suse uses rpm format packages, check to see that ssh is installed. rpm -q openssh . If not, install it.
To configure openssh, read the documentation on ssh and sshd in the man pages.
Putty is available at http://www.chiark.greenend.org.uk/~sgtatham/putty/
and winscp2 is at http://winscp.sourceforge.net/eng/
. Openssh is at http://www.openssh.com/
Also remember to configure your firewall to allow connections for ssh. (port 22)
Good luck - but remember, to practice safe computing