RFC 460 (rfc460) - Page 1 of 7

NCP survey

Network Working Group                                 Chuck S. Kline CSK
Request for Comments: 460                                           UCLA
NIC 14415                                                 13 February 73


                               NCP Survey

   1 This RFC is the first in a series which will request information on
   implementation of host to host protocol.  We would appreciate a reply
   to this RFC from all sites within two weeks.  One convenient way to
   reply is to make a copy of this RFC at the NIC and insert the replies
   at the appropriate spots.  The results of this survey will be
   published.  Please send replies to nic ident CSK or to

   Charles Kline
   Boelter Hall 3804
   UCLA
   405 Hilgard Ave.
   Los Angeles, Cal. 90034

   2 This particular RFC will deal with implementations of Network
   Control Programs (NCPs).  Future RFCs will deal with .
   implementations of Telnet, RJE, etc.

   3 In order to ask questions about NCPs and get meaningful replies, I
   will here describe what I consider to be my concept of an NCP.

      3a An NCP is that part of the system which performs the tasks
      necessary for host to host protocol as specified by document NIC
      7104 (protocols notebook).

      3b NCPs contain the following parts (though not necessarily as
      separate pieces):

         3b1 Code which handles connection establishment including
         maintenance of the rendezvous table (table of open and pending
         connections).

         3b2 Code which handles transmission over open connections
         including buffer management and the sending of allocate and
         giveback commands.

         3b3 Code which handles the actual movement of messages in and
         out of the Imp (sometimes called the Imp handler and sometimes
         in a separate cpu).

         3b4 Other code including measurements, initialization, etc.




Kline