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Network Working Group                                          B. KantorRequest for Comments: 1226                      Univ. of Calif San Diego                                                                May 1991Internet Protocol Encapsulation of AX.25 FramesStatus 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 1991Author'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.EDUKantor                                                          [Page 2]