[Text version]

This RFC is obsoleted by: RFC 750 , RFC 755 , RFC 758 , RFC 762 , RFC 770 , RFC 776 , RFC 790 , RFC 820 , RFC 870 , RFC 900 , RFC 923 , RFC 943 , RFC 960 , RFC 990 , RFC 997 , RFC 1010 , RFC 1020 , RFC 1060 , RFC 1062 , RFC 1117 , RFC 1166 , RFC 1340 , RFC 1700

Network Working Group RFC # 604 NIC # 21186

Jon Postel MITRE 26 December 1973

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 [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

       [ This RFC was put into machine readable form for entry ]
       [ into the online RFC archives by Alex McKenzie with    ]
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