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RFC 179 UNKNOWN ARPANET · LINKS

Link Number Assignments

A table assigning link numbers for control, connections and experiments.

On rfc-editor.org ↗
PUBLISHED
June 1971
AUTHORS
A.M. McKenzie
STREAM
Legacy
BUILDS ON
RFC 107 — Output of the Host-Host Protocol Glitch Cleaning Committee
CONTROL LINK
0
CONNECTION LINKS
2-71 (decimal)
MEASUREMENT LINK
191
PRIVATE EXPERIMENTAL LINKS
192-255
DOI
10.17487/RFC0179
LINEAGE · FROM THE RFC INDEXOpen full graph →
'71RFC 107Output of the Host-Host Protocol Glitch Cleaning Committee'71RFC 179Link Number Assignments

RFC text

Original text · RFC Editor View on rfc-editor.org ↗ 
Network Working Group                        Alex McKenzie
Request for Comments No. 179                 BBN
NIC No. 7119                                 22 June 1971
Category: C.9
Updates:  107
Obsoletes:  none


                        LINK NUMBER ASSIGNMENTS

     Today Steve Crocker asked me to announce that from now on link
numbers 2-71 (decimal), inclusive, are to be valid for use in
connections.  Accordingly, the Host-Host Protocol Document, which I am
currently writing, will contain the following "declarative
specification".

     Links are assigned as follows:

     Link Number         Assignment

     0                   Control link
     2-71                Available for connections
     1, 72-190           Reserved-not for current use
     191                 To be used only for measurement
                         work under the direction of the
                         Network Measurement Center at UCLA
     192-255             Available for private experimental use


     [ This RFC was put into machine readable form for entry ]
     [ into the online RFC archives by Kai Henningsen 5/97 ]

ISO Plain Language

On this page
PROBLEMHosts needed a shared statement of which Host-Host link numbers were available for connections.
MECHANISMThe RFC assigns link 0 to control, links 2 through 71 to connections, and other ranges to reserved or experimental uses.
WHY IT MATTERSIt updates RFC 107 and says the assignments will appear in the Host-Host Protocol document then being written.

§1The Assignment Announcement

Alex McKenzie announces that link numbers 2 through 71, inclusive, are valid for connections. He says the assignments will be included in the Host-Host Protocol document he is writing.

The unit metadata says RFC 179 updates RFC 107.

The note announces which link numbers hosts can use for connections. It says the same assignments will be included in a protocol document.

§2Link Number Ranges

Link 0 is the control link. Links 2 through 71 are available for connections. Link 1 and links 72 through 190 are reserved and not for current use.

Link 191 is reserved for measurement work under the direction of the Network Measurement Center at UCLA. Links 192 through 255 are available for private experimental use.

Link 0 carries control information, and links 2 through 71 are for connections. Other ranges are reserved for measurement or private experiments.

LINK NUMBER ASSIGNMENTS (RFC 179)
  • 0Control link — Assigned to the control link.
  • 2-71Connections — Available for connections.
  • 1, 72-190Reserved — Reserved, not for current use.
  • 191Measurement — Only for measurement work directed by the Network Measurement Center at UCLA.
  • 192-255Private experiments — Available for private experimental use.

§3Scope of the Table

The RFC presents a link-number table without a longer explanation of why each range was selected. It is a short assignment notice, and its metadata records that it updates RFC 107.

This document gives the assignments rather than a detailed design explanation. It updates RFC 107.

§4References

RFC 107RFC 107RFC 107, updated by the link number assignment in RFC 179.March 1971