RFC 1409 (rfc1409) - Page 2 of 7


Telnet Authentication Option



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RFC 1409              Telnet Authentication Option          January 1993


   IAC WILL AUTHENTICATION

      The client side of the connection sends this command to indicate
      that it is willing to send and receive authentication information.

   IAC DO AUTHENTICATION

      The servers side of the connection sends this command to indicate
      that it is willing to send and receive authentication information.

   IAC WONT AUTHENTICATION

      The client side of the connection sends this command to indicate
      that it refuses to send or receive authentication information; the
      server side sends this command if it receives a DO AUTHENTICATION
      command.

   IAC DONT AUTHENTICATION

      The server side of the connection sends this command to indicate
      that it refuses to send or receive authentication information; the
      client side sends this command if it receives a WILL
      AUTHENTICATION command.

   IAC SB AUTHENTICATION SEND authentication-type-pair-list IAC SE

      The sender of this command (the server) requests that the remote
      side send authentication information for one of the authentication
      types listed in "authentication-type-pair-list".  The
      "authentication-type-pair-list" is an ordered list of
      "authentication-type" pairs.  Only the server side (DO
      AUTHENTICATION) is allowed to send this.

   IAC SB AUTHENTICATION IS authentication-type-pair  IAC SE

      The sender of this command (the client) is sending the
      authentication information for authentication type
      "authentication-type-pair".  Only the client side (WILL
      AUTHENTICATION) is allowed to send this.

   IAC SB AUTHENTICATION REPLY authentication-type-pair  IAC
   SE

      The sender of this command (the server) is sending a reply to the
      the authentication information received in a previous IS command.
      Only the server side (DO AUTHENTICATION) is allowed to send this.





Telnet Working Group


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