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- Network Working Group B. Kantor
- Request for Comments: 1226 Univ. of Calif San Diego
- May 1991
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- Internet Protocol Encapsulation of AX.25 Frames
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- Status of this Memo
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- 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.
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- The AX.25 Amateur Packet-Radio Link-Layer Protocol
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- The AX.25 Amateur Packet-Radio Link-Layer Protocol is described in
- the publication by that name [1], incorporated here by reference.
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- 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.
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- 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.
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- Each such IP datagram shall have a protocol number of 93.
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- Reference
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- [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.
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- Security Considerations
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- Security issues are not discussed in this memo.
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- Kantor [Page 1]
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- RFC 1226 IP Encapsulation of AX.25 Frames May 1991
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- Author's Address
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- Brian Kantor
- University of California at San Diego
- Network Operations C-024
- La Jolla, CA 92093-0214
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- Phone: (619) 534-6865
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- EMail: brian@UCSD.EDU
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- Kantor [Page 2]
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