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+Network Working Group                                          B. Kantor
+Request for Comments: 1226                      Univ. of Calif San Diego
+                                                                May 1991
+
+
+            Internet Protocol Encapsulation of AX.25 Frames
+
+Status of this Memo
+
+   This memo describes a method for the encapsulation of AX.25 (the
+   Amateur Packet-Radio Link-Layer Protocol) frames within IP packets.
+   This technique is an Experimental Protocol for the Internet
+   community.  Discussion and suggestions for improvement are requested.
+   Please refer to the current edition of the "IAB Official Protocol
+   Standards" for the standardization state and status of this protocol.
+   Distribution of this memo is unlimited.
+
+The AX.25 Amateur Packet-Radio Link-Layer Protocol
+
+   The AX.25 Amateur Packet-Radio Link-Layer Protocol is described in
+   the publication by that name [1], incorporated here by reference.
+
+   Each AX.25 packet ("frame") is encapsulated in one IP datagram.
+   Normally no AX.25 frame will exceed 330 octets, so fragmentation at
+   the IP layer should not be necessary.  However, experiments with
+   larger AX.25 frame sizes may require the use of standard IP
+   fragmentation and reassembly procedures.
+
+   When an AX.25 frame is encapsulated within an IP packet, HDLC framing
+   elements (flags and zero-stuffing) are omitted, as the IP datagram
+   adequately delimits the beginning and end of each AX.25 frame.  The
+   16-bit CRC-CCITT frame check sequence (normally generated by the HDLC
+   transmission hardware) is included.  In all other respects, AX.25
+   frames are encapsulated unaltered.
+
+   Each such IP datagram shall have a protocol number of 93.
+
+Reference
+
+   [1] AX.25 Amateur Packet-Radio Link-Layer Protocol Version 2.0
+       October 1984.  Available from the American Radio Relay League,
+       Newington CT USA 06111, and other sources.
+
+Security Considerations
+
+   Security issues are not discussed in this memo.
+
+
+
+
+
+Kantor                                                          [Page 1]
+
+RFC 1226            IP Encapsulation of AX.25 Frames            May 1991
+
+
+Author's Address
+
+   Brian Kantor
+   University of California at San Diego
+   Network Operations C-024
+   La Jolla, CA 92093-0214
+
+   Phone: (619) 534-6865
+
+   EMail: brian@UCSD.EDU
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+Kantor                                                          [Page 2]
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