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- Network Working Group E. Harslem
- Request for Comments: 40 J. Heafner
- RAND
- March 1970
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- More Comments on the Forthcoming Protocol
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- 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.
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- Please voice your opinions soon in order to affect the forthcoming
- protocol specifications.
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- ERROR MESSAGES
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- <ERR> <Code> <Command length> <Command in error>
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- <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.
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- The ranges of <Code> are shown below in hexidecimal.
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- 00 Unspecified error types
- 10-0F Resource errors
- 10-1F Status errors
- 20-2F Content errors
- 30-3F Unused
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- Specific values of <Code> are shown below with their meaning.
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- <Code> value Semantics
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- 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>
- received.
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- [Page 1]
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- <Code> value Semantics
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- 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.
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- QUERIES
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- <QRY> <My Socket>
- or <RPY> <Your Socket> <Text>
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- 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.
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- <Text>::= <16 bit count of relevant connection table entries>
- <relevant connection table entries>
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- <relevant connection table entries>::=
- <relevant connection table entries>
- <a relevant connection table entry>
- <a relevant connection table entry>
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- <a relevant connection table entry>::= <local socket> <foreign socket>
- <link> <connection state>
- <flow state and buffer control>
- <reconnection control state>
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- [Page 2]
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- HOST STATUS
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- <NOP>
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- 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.
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- [ This RFC was put into machine readable form for entry ]
- [ into the online RFC archives by Richard Ames 6/97 ]
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- [Page 3]
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