NCP statistics
RFC 388

Document Type RFC - Unknown (August 1972; No errata)
Updates RFC 323
Last updated 2013-03-02
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Network Working Group                                            V. Cerf
Request for Comments: 388                                       UCLA-NMC
Obsoletes: 323                                            23 August 1972
NIC: 11360
Network Measurement Note #8

                             NCP Statistics

   After a lapse of 5 months since RFC #323 was issued (23 March), I am
   pleased to announce that UCLA-NMC is prepared to gather your NCP
   statistics automatically on a daily basis.  The results will be
   published monthly as Network Measurement notes and as RFC's.  We will
   periodically open a connection on your local socket @241 (decimal),
   expecting you to send the following data in the format shown:

                   <duplicate pages 3-5 of RFC 323 here>

      a. Total bits sent to HOST
      b. Total bits received from HOST
      c. Total messages sent to HOST
      d. Total messages received from HOST and optionally
      e. Average Round Trip delay on send connections to HOST

   The information above should be collected only for standard open
   connections (i.e. those using standard NCP protocol) and not
   measurement links or experimental NCP links, and in particular, not
   traffic on link 0).

   Another optional measurement would be to gather the distribution of
   message types over link 0 over all HOSTS (i.e. not broken down by
   HOST). This will reveal the relative utilization of control messages
   (ALLOC should be very prevalent).

   The data collected for the last 24 hour sample period should be
   available from a process listening on local socket number 241 (10).

Cerf                                                            [Page 1]
RFC 388                      NCP Statistics                  August 1972

                        16         16
                 +----------+------------+
   word 0        |  Day #   |  Time      |
                 +----------+------------+
                    |            |
   1 - 365 (6 on leap year)      |______
                                        |
                            Time in minutes at which sample was
                         started. Ranges from 0 (midnight) to 1439.

                8      8
            +--------+------+-------+----------+
   word 1   | Source | Byte |   N   |  Format  |
            |   Host | Size |       |          |
            +--------+------+-------+----------+
                |     |       |          |__________
         _______|     |       |                     |
        |             |  number of HOST             |
   Network Host       |  related entries  +---+---+---+---+---+---+
    number            |  in message       |   |   | C | R | B | M |
                      |                   +---+---+---+---+---+---+
           number of bits per                       |   |  |   |
           byte in byte statistics         ____ ____|   |  | message
                                           |         ___|  | statistics
                                           |        |     byte
                                       control      |  statistics
                              message distribution  |
                                                   average
                                               round-trip time

Cerf                                                            [Page 2]
RFC 388                      NCP Statistics                  August 1972

The remaining words of the message depend on Format byte setting:

               <-------32--------->
           / +---------------------+
           | |   Foreign HOST #    |     always present
           |-+---------------------+
           | |  messages received  |     if FORMAT bit M set
           | +---------------------+
           | |    Bytes received   |     if FORMAT bit B set
   N of    | +---------------------+
   these   | |     message sent    |     if FORMAT bit M set
   entries | +---------------------+
           | |      Bytes sent     |     if FORMAT bit B set
           | +---------------------+
           \ |   Average delay     |     if FORMAT bit R set
             +---------------------+
                                        This is average RFNM
                                        delay in milliseconds
             8         24
          +-------+---------------+
          |  type |     Count     |     if FORMAT bit C set these
          +-------+---------------+     are link 0 control message
          |       |               |     distributions for the
          +-------+---------------+     sample period, cumulative
          |       |               |     overall HOSTs. If a type is
          +-------+---------------+     not present, its count is
          |       |               |     assumed to be 0.
          +-------+---------------+
          |       |               |
          +-------+---------------+
          |       |               |
          +-------+---------------+
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