how to access machine using telnet

[Felipe Alfaro Solana]

> In my case (some time ago) I was dealing with a headless server I was
> set up on the other side of the world. (I live in Japan - server was
> in Canada) I wanted telnetd to be running, but not used except as a
> backup way to get in if sshd failed to work. (Which had happened once
> after changing the config file.) The insecurity of telnet is that
> everything is sent in the clear and passwords could be 'sniffed' on
> the local network. As a backup service there would be nothing to sniff
> unless I couldn't get in via ssh.

Or somebody tried running a password cracking program against your
telnet server. If you want a backup in case sshd goes mad, better get
access to the machine using an out-of-band mechanism, like a serial
line connected to a modem.