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-
- Elizabeth Feinler RFC 810
- Ken Harrenstien 1 March 1982
- Zaw-Sing Su References: RFC 811, 796
- Vic White Obsoletes: RFC 608
- Network Information Center
- SRI International
-
- DoD INTERNET HOST TABLE SPECIFICATION
-
-
-
- INTRODUCTION
-
- The ARPANET Official Network Host Table, as outlined in RFC 608, no
- longer suits the needs of the DoD community, nor does it follow a
- format suitable for internetting. This paper specifies a new host
- table format applicable to both ARPANET and Internet needs.
-
- In addition to host name to host address translation and selected
- protocol information, we have also included network and gateway name
- to address correspondence, and host operating system information.
-
- This Host Table is utilized by the DoD Host Name Server maintained by
- the ARPANET Network Information Center (NIC) on behalf of the Defense
- Communications Agency (DCA) (RFC 811). It obsoletes the host table
- described in RFC 608.
-
- LOCATION OF THE STANDARD DoD ONLINE HOST TABLE
-
- A machine-translatable ASCII text version of the new DoD Host Table
- is online in the file <NETINFO>HOSTS.TXT on the SRI-NIC host. It can
- be obtained by connecting to host SRI-NIC (10.0.0.73) from your local
- FTP server, logging in as user=ANONYMOUS, password=GUEST, and doing a
- 'get' on <NETINFO>HOSTS.TXT. The same table may also be obtained via
- the NIC Host Name Server.
-
- NOTE: See Appendix A. for timeframe for cutover.
-
- ASSUMPTIONS
-
- 1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
- to 24 characters drawn from the alphabet (A-Z), digits (0-9), and the
- minus sign (-) and period (.). No blank or space characters are
- permitted as part of a name. No distinction is made between upper
- and lower case. The first character must be a letter. The last
- character must not be a minus sign or period. A host which serves as
- a GATEWAY should have "-GATEWAY" or "-GW" as part of its name. A
- host which is a TIP or a TAC should have "-TIP" or "-TAC" as part of
- its host name, if it is an ARPANET or DoD host.
-
- 2. Internet Addresses are 32-bit addresses (RFC 796). In the host
- table described herein each address is represented by four decimal
- numbers separated by a period. Each decimal number represents 1
- octet.
-
- [Page 1]
-
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- RFC 810 1 March 1982
- Host Table Specification
-
-
- 3. If the first bit of the first octet of the address is 0 (zero),
- then the next 7 bits of the first octet indicate the network number
- (Class A Address). If the first two bits are 1,0 (one,zero), then
- the next 14 bits define the net number (Class B Address). If the
- first 3 bits are 1,1,0 (one,one,zero), then the next 21 bits define
- the net number (Class C Address) (RFC 796).
-
- This is depicted in the following diagram:
-
- +--------------+-----------------------------------------------+
- |0| NET <-7-> | LOCAL ADDRESS <-24-> |
- +--------------+-----------------------------------------------+
-
- +---+--------------------------+-------------------------------+
- |1 0| NET <-14-> | LOCAL ADDRESS <-16-> |
- +---+--------------------------+-------------------------------+
-
- +-----+----------------------------------------+---------------+
- |1 1 0| NET <-21-> | LOCAL ADDRESS |
- +-----+----------------------------------------+---------------+
-
- 4. The LOCAL ADDRESS portion of the internet address identifies a
- host within the network specified by the NET portion of the address.
-
- 5. For the ARPANET (a Class A network), the NET address is 10
- (decimal) and the LOCAL ADDRESS maps as follows: the second octet
- defines the physical host, the third octet defines the logical host,
- and the fourth defines the IMP.
-
- +-+-------------+---------------+--------------+---------------+
- |0| 10 | HOST | LOGICAL HOST | IMP |
- +-+-------------+---------------+--------------+---------------+
-
- (NOTE: RFC 796 describes the local address mappings for several
- other networks.)
-
- 6. It is the responsibility of the user using this host table to
- translate it into whatever format is needed for his or her purposes.
-
- 7. Names and Addresses for DoD networks, gateways, and hosts will be
- negotiated and registered with the Network Information Center
- (NIC@SRI-NIC or (415) 859-4775) before being used and before traffic
- is passed by a DoD host. For an interim period the NIC will attempt
- to keep similar information for non-DoD networks and hosts if this
- information is provided, and as long as it is needed, i.e., until
- intercommunicating network name servers are in place.
-
- EXAMPLE OF NEW HOST TABLE FORMAT
-
- NET : 10.0.0.0 : ARPANET :
-
- [Page 2]
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- 1 March 1982 RFC 810
- Host Table Specification
-
-
- 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 : FOONLY-F3 : TENEX :
- NCP/TELNET,NCP/FTP, TCP/TELNET, TCP/FTP :
- HOST: 10.2.0.11 : SU-TIP,FELT-TIP :::
-
- SYNTAX AND CONVENTIONS
-
- ; (semicolon) is used to denote the beginning of a comment.
- Any text on a given line following a ';' is
- comment, and not part of the host table.
-
- NET keyword introducing a network name/address entry
-
- GATEWAY keyword introducing a gateway name/address entry
-
- HOST keyword introducing a host name/address entry
-
- : (colon) is used as a field delimiter
-
- :: (2 colons) indicates a null field
-
- , (comma) is used as a data element delimiter
-
- XXX/YYY indicates protocol information of the type
- TRANSPORT/SERVICE.
-
- where TRANSPORT/SERVICE options are specified as
-
- "FOO/BAR" - both transport and service known
- "FOO" - transport known; services not known or not
- running, OR
- "BAR" - name is known, what it does is not
-
- NOTE: See Appendices B and C for specific options and
- acronyms.
-
- Each host table entry is an ASCII text string comprised of 6 fields,
- where
-
- Field 1 = KEYWORD indicating whether this entry pertains
- to a NET, GATEWAY, or HOST. NET entries cannot have
- alternate addresses or nicknames.
- Field 2 = Internet Address of Network, Gateway, or Host
- followed by alternate addresses
- Field 3 = Official Name of Network, Gateway, or Host
- (with optional nicknames)
- Field 4 = Machine Type
- Field 5 = Operating System
- Field 6 = Protocol List
-
- [Page 3]
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- RFC 810 1 March 1982
- Host Table Specification
-
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- Fields 4, 5 and 6 are optional.
-
- Fields 3-6, if available, pertain to the first address in Field 2.
-
- 'Blanks' (spaces and tabs) are ignored between data elements or
- fields, but are disallowed within a data element.
-
- Each entry ends with a colon.
-
- The host table will be sorted by internet address.
-
- GRAMMATICAL HOST TABLE SPECIFICATION
-
- A. Parsing grammar
-
- <entry> ::= <keyword> ":" <addresses> ":" <names> [":" [<cputype>]
- [":" [<opsys>] [":" [<protocol list>] ]]] ":"
- <addresses> ::= <address> *["," <address>]
- <address> ::= <octet> "." <octet> "." <octet> "." <octet>
- <octet> ::= <0 to 255 decimal>
- <names> ::= <netname> | <gatename>
- | <official hostname> *["," <nicknames>]
- <netname> ::= <name>
- <gatename> ::= <name>
- <official hostname> ::= <name>
- <nickname> ::= <name>
- <protocol list> ::= <protocol spec> *["," <protocol spec>]
- <protocol spec> ::= <transport name> "/" <service name> |
- <raw protocol name>
-
- B. Lexical grammar
-
- <entry-field> ::= <entry-text> [<cr><lf> <blank> <entry-field>]
- <blank> ::= <space or tab>
- <keyword> ::= NET | GATEWAY | HOST
- <name> ::= <letter>[*[<letter-or-digit-or-hyphen>]<letter-or-digit>]
- <cputype> ::= PDP-11/70 | DEC-1080 | C/30 | CDC-6400...etc.
- <opsys> ::= ITS | MULTICS | TOPS20 | UNIX...etc.
- <transport name> ::= TCP | NCP | UDP | IP...etc.
- <service name> ::= TELNET | FTP | SMTP | MTP...etc.
- <raw protocol name> ::= <name>
- <comment> ::= ";" <arbitrary text><cr><lf>
-
- Notes:
-
- 1. Zero or more 'blanks' between separators " , : " are allowed.
- 'Blanks' are spaces and tabs.
- 2. Continuation lines are lines that begin with at least one
- blank. They may be used anywhere 'blanks' are legal to split an
- entry across lines.
-
- [Page 4]
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- 1 March 1982 RFC 810
- Host Table Specification
-
-
- BIBLIOGRAPHY
-
- 1. Feinler, E. and Kudlick, M. Host Names Online, RFC 608,
- Network Information Center, SRI International, Jan. 1973.
-
- 2. Postel, J. Assigned Numbers, RFC 790, Information Sciences
- Inst., Univ. of Southern Calif., Marina Del Rey, Sept. 1981.
-
- 3. Postel, J. Internet Protocol, RFC 791, Information Sciences
- Inst., Univ. of Southern Calif., Marina Del Rey, Sept. 1981.
-
- 4. Postel, J. Address Mappings, RFC 796, Information Sciences
- Inst., Univ. of Southern Calif., Marina Del Rey, Sept. 1981.
-
- 5. 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.
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- [Page 5]
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- RFC 810 1 March 1982
- Host Table Specification
-
-
- APPENDIX A. CUTOVER DETAILS
-
-
- The cutover date for use of the new host table is 1 May 1982. The
- table below indicates which files will contain the old or the new
- versions of the host table for what period of time. After 1 August
- 1982, the old format for <NETINFO>HOSTS.TXT (specified in RFC-608)
- will no longer be supported.
-
- --------------------------------------------------------------------
- May 1982 June-July 1982 August 1982 on
- --------------------------------------------------------------------
-
- <NETINFO>HOSTS.TXT <NETINFO>HOSTS.TXT <NETINFO>HOSTS.TXT
- old version new version new version
-
- <NETINFO>NHOSTS.TXT <NETINFO>NHOSTS.TXT old version
- new version (test) new version discontinued
-
- <NETINFO>OHOSTS.TXT <NETINFO>OHOSTS.TXT
- old version old version
-
- --------------------------------------------------------------------
-
- These periods of overlap should give implementors time to make the
- necessary changes to programs accessing this file.
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- 1 March 1982 RFC 810
- Host Table Specification
-
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- APPENDIX B. TRANSPORT/SERVICE OPTIONS AND ACRONYMS
-
-
- Current TRANSPORT/SERVICE options are:
-
- IP TCP/FTP
- IP/GW TCP/MTP
- NCP TCP/NNS
- NCP/FTP TCP/RJE
- NCP/RJE TCP/SMTP
- NCP/SMTP TCP/TELNET
- NCP/TELNET TCP/TFTP
- NCP/NNS UDP
- NVP
- TCP
-
- Note: "TCP" implies IP is also implemented
-
- Acronym definitions for the above protocol options are:
-
- FTP - File Transfer Protocol
- GW - Gateway Protocol
- IP - Internet Protocol
- MTP - Mail Transfer Protocol
- NCP - Network Control Protocol
- NNP - NIC Internet Name Server Protocol
- NVP - Network Voice Protocol
- RJE - Remote Job Entry Protocol
- SMTP - Simple Mail Transfer Protocol
- TELNET - TELNET Protocol
- TCP - Transmission Control Protocol
- TFTP - Trivial File Transfer Protocol
- UDP - User Datagram Protocol
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- RFC 810 1 March 1982
- Host Table Specification
-
-
- APPENDIX C. OPERATING SYSTEM ACRONYMS
-
- Current operating system acronyms are:
-
- ASP KRONOS RSX11M VMS
- AUGUST MCP RT11 WAITS
- BKY MOS SCOPE
- CCP MPX-RT SIGNAL
- DOS/360 MULTICS SINTRAN
- ELF MVT TENEX
- EPOS NOS TOPS10
- EXEC-8 NOS/BE TOPS20
- GCOS OS/MVS TSS
- GPOS OS/MVT UNIX
- ITS RIG VM/370
- INTERCOM RSX11 VM/CMS
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