Securing Telnet Access

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Telnet (Telecommunication network) is a network protocol used on the Internet or local area networks. It was developed in 1969 beginning with RFC 15 (Request For Comments 15 ) and standardized as IETF (Internet Engineering Task Force) STD 8, one of the first Internet standards. Typically, Telnet provides access to a command-line interface on a remote machine.

Telnet is a protocol that allows a user to establish a remote connection to a device. After connected to the remote device, you are presented with a screen that is identical to the screen that would be displayed if you were directly connected to the console port. Telnet ports on a router are referred to as virtual terminal ports. Telnet is really no different from a console connection, and as such, the

proper logical security mechanisms should be put into place to ensure that only responsible personnel are allowed Telnet access. Virtual terminal ports support many different methods for authenticating a user and allowing access. Some of the methods are included in the following list:

· Vty password
· Local user database
· TACACS+
· RADIUS

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