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RFC 0040

Network Working Group                                         E. Harslem
Request for Comments: 40                                      J. Heafner
                                                              March 1970

               More Comments on the Forthcoming Protocol

We have recently discussed NWG/RFC Nos. 36 and 39 with Steve Crocker,
UCLA.  Steve has asked that we elaborate on the errors, queries, and
HOST status that were mentioned in NWG/RFC #39.

Please voice your opinions soon in order to affect the forthcoming
protocol specifications.


     <ERR> <Code> <Command length> <Command in error>

<Code> is an eight-bit field that specifies the error type.  The
assigned codes are shown below.  <Command length> is a 16-bit integer
that indicates the length of the <Command in error> in bits.  The
<Command in error> is the spurious command.

The ranges of <Code> are shown below in hexidecimal.

     00     Unspecified error types
     10-0F  Resource errors
     10-1F  Status errors
     20-2F  Content errors
     30-3F  Unused

Specific values of <Code> are shown below with their meaning.

     <Code> value   Semantics

         00         Unspecified errors.
         01         Request for an invalid resource.
         02         Request for an exhausted resource, try later.
        03-0F       Unused.
         10         Invalid <RSM>, i.e., link connected but unblocked.
         11         Invalid <SPD>.
         12         Invalid <ASG>, i.e., connected but no <RDY>

                                                                [Page 1]

<Code> value Semantics 13 Message received on blocked link. 14-1F Unused. 20 Unknown command code. 21 Message received on unconnected link. 22 Invalid <RFC>. 23 Invalid <CLS>. 24 Invalid <RSM>, i.e., link not connected. 25 Invalid <FND>. 26 Invalid <END>. 27 Invalid <RDY>. 28 Invalid <ASG>, i.e., not connected. 29-2F Unused. 30-FF Unused. QUERIES <QRY> <My Socket> or <RPY> <Your Socket> <Text> The <QRY> is the query indicated in NWG/RFC #39 and <RPY> is the reply. The format of <Text> is shown below; also refer to NWG/RFC #36, p. 3. <Text>::= <16 bit count of relevant connection table entries> <relevant connection table entries> <relevant connection table entries>::= <relevant connection table entries> <a relevant connection table entry> <a relevant connection table entry> <a relevant connection table entry>::= <local socket> <foreign socket> <link> <connection state> <flow state and buffer control> <reconnection control state> [Page 2]

HOST STATUS <NOP> An NCP may be up, down, pending, etc. When an NCP changes its state to UP it should send a <NOP> to each remote NCP which indicates the NCP is available. The sending NCP can then construct a vector of HOST status from the RFNMs it receives. An NCP receiving a <NOP> can update the availability of the sending NCP in its HOST status vector. [ This RFC was put into machine readable form for entry ] [ into the online RFC archives by Richard Ames 6/97 ] [Page 3]

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