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+Network Working Group                                          Vint Cerf
+Request for Comments: 22                                            UCLA
+                                                        October 17, 1969
+
+
+                   Host-Host Control Message Formats
+
+   NWG/RFC 11 has been modified at UCLA; and will be republished.  In
+   the meantime, it seems important to report a new control message
+   format which does not use 7-bit ASCII character mode of transmission.
+
+   All Host-Host control messages consist of sequences of 8-bit bytes of
+   the form:
+
+   <control byte> <parameter byte l> ... <parameter byte n>
+
+   It is reasonable to transmit more than one control message in any
+   given packet, although this is not mandatory.
+
+   Presently, 9 control messages have been defined by UCLA; these are
+   given in the table below along with their parameters.  The
+   interpretation is given from the point of view of the transmitting
+   host. ("L" or "Li" mean Link#, and are binary values.)
+
+   Control byte     Parameter      Interpretation
+
+    <0>             <L>           Please establish primary connection;
+                                  our output link # is L
+
+    <1>             <L,> <L2>     Please establish auxiliary connection
+                                  parallel to our primary output link L.
+                                  The auxiliary output link is L2.
+
+    <2>             <L1> <L2>     DK primary.  Your primary output link
+                                  to us was L; our primary output link
+                                  to you is L2.
+
+    <3>             <L1> <L2>     OK auxiliary.  Your auxiliary output
+                                  link is Li, our auxiliary output link
+                                  is L2.
+
+    <4>             <L>           Not OK primary.  We cannot establish a
+                                  primary connection.  Your primary
+                                  output link number was L.
+
+    <5>             <Li> <L2>     Not OK auxiliary.  We cannot establish
+                                  an auxiliary connection.  Your primary
+                                  output link no was L2.
+
+
+
+Cerf                                                            [Page 1]
+
+RFC 22             Host-Host Control Message Formats        October 1969
+
+
+    <6>             <L>           Please stop transmitting over link
+                                  number L.  This is called the CEASE
+                                  directive.
+
+    <7>             <L>           We are CLOSING our output link number
+                                  L.  You may get this message before
+                                  the last message arrives over this
+                                  link since control messages are higher
+                                  priority than regular data messages.
+
+    <8>             <L>           UNCEASE: that is, you may resume
+                                  transmitting over output link number
+                                  L.
+
+   Each control message is embedded in the appropriate message structure
+   e.g.:
+
+               <-------------32 bits --------------->
+               |           HEADER                   |
+               |____________________________________|
+               |      |       |           |         |
+               | mark |  l    |  <L1>     |  <L2>   |
+               |______|_______|___________|_________|
+               |                 |                  |
+               |     checksum    |     Padding      |
+               |_________________|__________________|
+                 typical control message (please
+                 establish auxiliary link #L2
+                 parallel to our primary link #l)
+
+   The header for all HOST-HOST control messages is given below:
+
+   0     3  4   7  8  9   10   14   LINK#      24              31
+   _______________________________________________________________
+   |       |      |     |       |               |////////////////|
+   | FLAGS | TYPE |  H  |  SITE | 00000001      |////////////////|
+   |_______|______|_____|_______|_______________|________________|
+
+   where  FLAGS - 0000
+          TYPE  - 0000 (regular message)
+          H     - host #(0-3) at SITE (usually 0 for single HOST sites)
+          SITE  - Site #
+          LINK# - 00000001 (HOST-HOST control link)
+
+
+       [ This RFC was put into machine readable form for entry ]
+      [ into the online RFC archives by Alison De La Cruz 12/00 ]
+
+
+
+
+Cerf                                                            [Page 2]
+