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-
- Ken Harrenstien RFC-811
- Vic White 1 March 1982
- Elizabeth Feinler
- Network Information Center
- SRI International
-
- HOSTNAMES SERVER
-
-
-
-
- INTRODUCTION
-
- The NIC Internet Hostnames Server is an NCP/TCP-based host
- information program and protocol running on the SRI-NIC
- machine. It is one of a series of ARPANET/Internet name
- services maintained by the Network Information Center (NIC) at
- SRI International on behalf of the Defense Communications
- Agency (DCA). The function of this particular server is to
- deliver machine-readable name/address information describing
- networks, gateways, hosts, and eventually domains, within the
- internet environment. As currently implemented, the server
- provides the information outlined in the DoD Internet Host
- Table Specification (RFC 810).
-
- QUERY/RESPONSE FORMAT
-
- The name server accepts simple text query requests of the form
-
- <command key> <argument(s)> [<options>]
-
- where square brackets ("[]") indicate an optional field. The
- command key is a keyword indicating the nature of the request.
- The defined keys are explained below.
-
- The response, on the other hand, is of the form
-
- <response key> : <rest of response>
-
- where <response key> is a keyword indicating the nature of the
- response, and the rest of the response is interpreted in the
- context of the key.
-
- COMMAND/RESPONSE KEYS
-
- The currently defined keywords are:
-
- Command Keys:
-
- HNAME (find entry with given name)
- HADDR (find entry with given address)
- ALL (return entire host table)
-
-
-
-
- [Page 1]
-
-
- 1 March 1982
- RFC 811 Hostnames Server
-
-
- Response Keys:
-
- ERR (entry not found, nature of error follows)
- NET (entry found, rest of entry follows)
- GATEWAY (entry found, rest of entry follows)
- HOST (entry found, rest of entry follows)
- BEGIN (followed by multiple entries)
- END (done with BEGIN block of entries)
-
- More keywords will be added as new needs are recognized. A
- more detailed description of the allowed requests/responses
- will follow.
-
- PROTOCOL
-
- To access this server from a program, connect to service host
- (SRI-NIC)
-
- TCP: port 101 decimal
- NCP: socket 101 decimal for ICP
-
- send the information query, and await the response.
-
- Note: Care should be taken to interpret the nature of the
- reply (e.g, single record or multiple record), so that no
- confusion about the state of the reply results. An "ALL"
- request will likely return several hundred or more records of
- all types (see RFC 810), whereas "HNAME" or "HADDR" will
- usually return one HOST record, or "BEGIN:", list of host
- records, "END:", if there is more than one match.
-
- QUERY/RESPONSE EXAMPLES
-
- 1. HNAME Query - Given a name, find the entry or entries that
- match
- the name. For example:
-
- HNAME SRI-NIC <CRLF> ;where <CRLF> is a carriage
- return/
- linefeed, and 'SRI-NIC' is a
- host name
-
- The likely response is:
-
- HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :
-
- A response may stretch across more than one line.
- Continuation lines always begin with at least one space.
- For example:
-
- HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :
-
- [Page 2]
-
-
- 1 March 1982
- Hostnames Server RFC 811
-
-
-
- 2. HADDR Query - Given an internet address (as specified in
- RFC
- 796) find the entry or entries that match that address.
- For example:
-
- HADDR 10.0.0.73 <CRLF> ;where <CRLF> is a carriage
- return/
- linefeed, and '10.0.0.73' is a
- host
- address
-
- The likely response is the same as for the HNAME request:
-
- HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :
-
-
- 3. ALL Query - Deliver the entire internet host table in a
- machine-readable form. For example:
-
- ALL <CRLF> ;where <CRLF> is a carriage return/linefeed
-
- The likely response is the keyword 'BEGIN' followed by a
- colon ':', followed by the entire internet host table in
- the format specified in RFC 810, followed by 'END:'. For
- example:
-
- BEGIN:
- NET : 10.0.0.0 : ARPANET :
- NET : 18.0.0.0 : LCSNET :
- GATEWAY : 10.0.0.77, 18.8.0.4 : MIT-GW :: MOS : IP/GW :
- HOST : 10.0.0.73 : SRI-NIC,NIC : TENEX : FOONLY-F3
- NCP/TELNET, NCP/FTP, TCP :
- HOST : 10.2.0.11 : SU-TIP, FELT-TIP ::
- END:
-
- ERROR HANDLING
-
- 1. ERR Reply - may occur on any query, and should be permitted
- in
- any access program using the name server. Errors are of
- the form
-
- ERR : <code> : <string> :
-
- as in
-
- ERR : NAMNFD : Name not found :
-
-
-
-
- [Page 3]
-
-
- 1 March 1982
- RFC 811 Hostnames Server
-
-
- The error code is a unique descriptor, limited to 8 characters
- in length for any given error. It may be used by the access
- program to identify the error and, in some cases, to handle it
- automatically. The string is an accompanying message for a
- given error for that case where the access program simply logs
- the error message. Current codes and their associated
- interpretations are
-
- NAMNFD -- Name not found; name not in table
- ADRNFD -- Address not found; address not in
- table
- ILLCOM -- Illegal command; command key not
- recognized
- TMPSYS -- Temporary system failure, try again
- later
-
- REMARKS
-
- The host name server described above runs over a single global
- internet host name/address data base. This data base is an
- extension of the old ARPANET Hosts.txt file, and is being
- maintained by the NIC to provide continuity during the
- transition and expansion to the internet environment. We view
- the central administration of a global host name data base,
- along with this simple name server, as an interim solution on
- the way to a decentralized, distributed name/address
- translation service. The NIC welcomes your comments and
- suggestions for such an expanded service. Send comments to
- NIC@SRI-NIC.
-
- REFERENCES
-
- 1. Feinler, E., Harrenstien, K., Su, Z. and White, V.
- Official
- DoD Internet Host Table Specification, RFC 810, Network
- Information Center, SRI International, March 1, 1982.
-
- 2. Postel, J. Address Mappings, RFC 796, Information Sciences
- Inst., Univ. of Southern Calif., Marina Del Rey, Sept.
- 1981.
-
- 3. Pickens, J., Feinler, E., and Mathis, J. The NIC Name
- Server,
- A Datagram-based Information Utility, Network Information
- Center, SRI International, July 1979.
-
-
-
-
-
-
-
- [Page 4]
-
-