RFC 175

Network Working Group                        11 June 1971
Request for Comments: 175                    E. Harslem - Rand
NIC 7074                                     J. Heafner - Rand

             Comments on "Socket Conventions Reconsidered"
             ---------------------------------------------

        We agree with the conclusions reached by Abhay, Bob, and Joel in
   RFC #167, "Socket Conventions Reconsidered," (see RFC #129, scheme #4)
   -- especially the necessity for a major NCP overhaul.

        Our main departure in thinking from RFC #167 concerns the socket
   length. (See RFC #164, page 21.)  Since there is an apparently serious
   TIP storage consideration, Rand- assigned sockets will have the
   high-order 16 bits zero.

        For the particular programs (current and pending) that Rand must
   access, repeatability of socket name (RFC #167, page 3) is not
   necessary for the user process and also not necessary for the server
   process except for initial contact (ICP) sockets.

   Our current use of socket names is diagrammed below.

    O           15 16             23 24          30 31
    ---------------------------------------------------
   |              |                 |              |   |
    ---------------------------------------------------
     ^              ^                 ^              ^
     |_ zero        |                 |              |_ gender
                    |                 |
                    |                 |_ zero for initial
                    |                    contact, otherwise
                    |                    dynamically assigned
                    |                    by 3rd level user
                    |                    program
                    |_ administratively assigned (fixed
                       and associated with programs)

   (NOTE: This scheme corresponds exactly with both UCSB and UCLA/CCN
   conventions).

       [ This RFC was put into machine readable form for entry ]
       [ into the online RFC archives by BBN Corp. under the   ]
       [ direction of Alex McKenzie.                   12/96   ]

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