RFC604

Network Working Group Jon Postel RFC # 604 MITRE NIC # 21186 26 December 1973

                     Assigned Link Numbers

This announcement modifies the official host-to-host protocol, and updates the defining documents [NIC 8246, NIC 9347]. Please note that the information on page 28 of "Host/Host Protocol for the ARPA Network" about link number assignments is updated by this note, and that a previous update [[[RFC317|RFC 317]], NIC 9347] is completely replaced. The modification is minor and should have no effect on existing network programs or usage. Four of the reserved link numbers are hereby assigned for experimental use in the testing of an internetworking protocol defined by Kahn and Cerf.

Description:

Control Link

    Link 0 is assigned for use as the host-to-host protocol control
    link.

Data Links

    Links 2-71 are available for use in connections as provided by
    the host-to-host protocol.

Internetworking Protocol

    Links 155-158 are to be used for experiments with the
    Internetworking Protocol.

Measurements

    Links 159-191 are assigned for use in measurements under the
    direction of the Network Measurement Center at UCLA.

Message Switching

    Links 192-195 are to be used for experiments with the Message
    Switching Protocol.

Private Experiments

    Links 196-255 are available for private experimental use.

Reserved

    Link 1, and links 72-154 are reserved for future developments
    and experiments and currently are not to be used.

Table:

    Link Number              Assignment

        0                    Control Link
        1                    Reserved
       2-71                  Connections
      72-154                 Reserved
     155-158                 Internetworking Protocol
     159-191                 Measurements
     192-195                 Message Switching Protocol
     196-255                 Experimental

References:

    Host-to-host Protocol           NIC 8246
    Internetworking Protocol        NIC 18764
    Message Switching Protocol      NIC 9926

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