


      TTTTEEEELLLLNNNNEEEETTTTDDDD((((1111))))                  ((((bbbbssssdddd 4444....2222))))                  TTTTEEEELLLLNNNNEEEETTTTDDDD((((1111))))



      NNNNAAAAMMMMEEEE
           telnetd - DARPA TELNET protocol server

      SSSSYYYYNNNNTTTTAAAAXXXX
           ////eeeettttcccc////tttteeeellllnnnneeeettttdddd [ ----dddd ] [ _p_o_r_t ]

      DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
           _T_e_l_n_e_t_d is a server which supports the DARPA standard TELNET
           virtual terminal protocol.  The TELNET server operates at
           the port indicated in the ``telnet'' service description;
           see _s_e_r_v_i_c_e_s(4).  This port number may be overridden (for
           debugging purposes) by specifying a port number on the
           command line.  If the ----dddd option is specified, each socket
           created by _t_e_l_n_e_t_d will have debugging enabled.

           _T_e_l_n_e_t_d operates by allocating a pseudo-terminal device (see
           _p_t_y(7)) for a client, then creating a login process which
           has the slave side of the pseudo-terminal as ssssttttddddiiiinnnn, ssssttttddddoooouuuutttt,
           and ssssttttddddeeeerrrrrrrr.  _T_e_l_n_e_t_d 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, _t_e_l_n_e_t_d 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 with XTABS and CRMOD enabled (see
           _t_e_r_m_i_o(7)).  Aside from this initial setup, the only mode
           changes _t_e_l_n_e_t_d will carry out are those required for
           echoing characters at the client side of the connection.

           _T_e_l_n_e_t_d supports binary mode, as well as most of the common
           TELNET options, but does not, for instance, support timing
           marks.

      SSSSEEEEEEEE AAAALLLLSSSSOOOO
           telnet(1)


















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