telnetd(1M)                                              telnetd(1M)


       NAME
             telnetd - TELNET protocol server

       SYNOPSIS
             in.telnetd [-debug [port]] [-h] [-D options]

       DESCRIPTION
             The telnetd command is a server which supports the standard
             TELNET virtual terminal protocol.

             The telnetd command operates by allocating a pseudo-terminal
             device for a client, thereby creating a login process which
             has the slave side of the pseudo-terminal serving as stdin,
             stdout, and stderr.  The telnetd command manipulates the
             master side of the pseudo-terminal by implementing the TELNET
             protocol, and by passing characters between the remote client
             and the login process.

             When a TELNET session is started up, telnetd sends TELNET
             options to the client side, indicating a willingness to

                   remote echo characters

                   suppress go ahead

                   remote flow control

                   receive terminal type information from the remote client

                   receive terminal speed information from the remote
                   client

                   receive window size information from the remote client

             If the remote client is willing, the remote terminal type will
             be propagated to the environment of the created login process.
             The pseudo-terminal allocated to the client will be configured
             to operate in ``cooked'' mode, with XTABS and CRMOD enabled
             [see termio(7)].

             The telnetd command is willing to do the following TELNET
             commands: echo, binary, suppress go ahead, and timing mark.

             The telnetd command is also willing to have the remote client
             do the following TELNET commands: linemode, binary, terminal
             type, terminal speed, window size, toggle flow control,


                           Copyright 1994 Novell, Inc.               Page 1

      telnetd(1M)                                              telnetd(1M)


            environment, X display location, and suppress go ahead.

      USAGE
            telnetd is invoked by the Internet server [see inetd(1M)],
            normally for requests to connect to the TELNET port, as
            indicated by the /etc/services file [see services(4)].

         Options
            The -debug option can be used to start up telnetd manually,
            instead of through inetd(1M).  If started up in this manner,
            port may be specified to run telnetd on this alternate TCP
            port number.

            The -h option stops telnetd printing a login banner.

            The -D option is used for debugging purposes.  This option
            allows telnet to print out debugging information to the
            connection, thus enabling the user to see what telnetd is
            doing.

            The following modifiers are available for the debugging mode:

            exercise    is reserved for future use

            netdata     displays the data stream received by telnetd

            options     prints information about the negotiation of the
                        TELNET options

            ptydata     displays data written to the pty

            report      prints the options information, as well as some
                        additional information about what processing is
                        going on

      REFERENCES
            telnet(1)

      NOTICES
            Some TELNET commands are only partially implemented.

            Because of bugs in the original 4.2 BSD telnet(1), telnetd
            performs some dubious protocol exchanges to try to discover if
            the remote client is, in fact, a 4.2 BSD telnet(1).




                          Copyright 1994 Novell, Inc.               Page 2

       telnetd(1M)                                              telnetd(1M)


             Binary mode has no common interpretation except between
             similar operating systems (UNIX in this case).

             The terminal type name received from the remote client will be
             converted into lower case.

             telnetd never sends TELNET go ahead commands.









































                           Copyright 1994 Novell, Inc.               Page 3