TELNETD(8N)             COMMAND REFERENCE             TELNETD(8N)



NAME
     telnetd - DARPA TELNET protocol server

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

DESCRIPTION
     Telnetd is a server which supports the DARPA standard TELNET
     virtual terminal protocol.  The TELNET server process is
     started (by inetd(8n)) when a connection is made at the port
     indicated in the TELNET service description; see
     services(5n).  This port number may be overridden (for
     debugging purposes) by specifying a port number on the
     command line.

     Telnetd operates by allocating a pseudo-terminal device for
     a client, then creating 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 is started up, telnetd sends a TELNET
     option to the client side indicating a willingness to do
     ``remote echo'' of characters.  The pseudo terminal
     allocated to the client is configured to operate in
     ``cooked'' mode, and with XTABS and CRMOD enabled (see
     tty(4)).  Aside from this initial setup, the only mode
     changes telnetd will carry 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 which options
     are not implemented.

OPTIONS
     -d Causes each socket created by telnetd to have debugging
        enabled (see SO_DEBUG in socket(2)).

RETURN VALUE
     [0]              Telnetd is running.

     [1]              Telnetd is not running.

SEE ALSO
     telnet(1n) and inetd(8n).








Printed 4/6/89                                                  1

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