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+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 [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.
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+Postel [Page 1]
+
+RFC 604 Assigned Link Numbers December 1973
+
+
+ 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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+ [ This RFC was put into machine readable form for entry ]
+ [ into the online RFC archives by Alex McKenzie with ]
+ [ support from GTE, formerly BBN Corp. 10/99 ]
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+Postel [Page 2]
+