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To connect to a local system on the department's network from the Internet,
you must connect to the telnet-proxy on the firewall system first. In
order to do so, simply telnet to the firewall system as if you wished to
login to it. There will be a short pause and you will be prompted to
authenticate yourself to the proxy-server. More about that
and one-time passwords later.
After successful authentication, you will be prompted with a command
prompt for the proxy. At the command prompt, you may specify the host
you wish to connect to, by typing "connect hostname"
or "c hostname". If you prefer to give an IP address instead of a
host name, you may do so. Once you have entered the name of the host to
connect to, the proxy will connect you to that host, and its login prompt
should appear. If the system is down or is unreachable, the proxy will inform
you of this fact, and you may attempt to connect to a different system or
quit completely using the "quit" command.
For example, if you are joe and you are abroad on
host foo.bar.com and want to connect with TELNET
to sunshine.cs.uu.nl you might employ the proxy as follows:
foo.bar.com% telnet gatekeeper.cs.uu.nl
Connected to gatekeeper.cs.uu.nl.
Escape character is '^]'.
Skey Challenge "s/key 512 gz12345": FAT FEND DEFY FUEL LENS ORE
telnet-gate-> connect sunshine
Trying 184.108.40.206 port 23...