telnetd(1M)                                           telnetd(1M)



     NAME
          telnetd - DARPA TELNET protocol server

     SYNOPSIS
          /etc/telnetd [-d] [port]

     DESCRIPTION
          telnetd is a server supporting the DARPA standard TELNET
          virtual terminal protocol. The TELNET server operates at the
          port indicated in the telnet service description; see
          services(4N).

          port override the default port number (for debugging)

          -d   enable debugging on each socket created by telnetd (see
               SODEBUGin socket(2N))

          telnetd allocates a pseudo-terminal device (see pty(5)) for
          a client, then creates a login process which has the slave
          side of the pseudo-terminal as stdin, stdout, and stderr.
          telnetd manipulates the master side of the pseudo terminal,
          implementing the TELNET protocol and passing characters
          between the client and login process.

          When a TELNET session starts up, telnetd sends a TELNET
          option to the client side, indicating a willingness to
          remotely echo characters.  The pseudo terminal allocated to
          the client is configured to operate in cooked mode, (see
          termio(7)).  Aside from this initial setup, the only mode
          changes telnetd carries out are those required for echoing
          characters at the client side of the connection.

          telnetd supports binary mode, and most of the common TELNET
          options, but does not, for instance, support timing marks.
          Consult the source code for an exact list of non-implemented
          options.

     FILES
          /etc/telnetd

     SEE ALSO
          telnet(1N), services(4N), pty(5), termio(7).













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