Difference between revisions of "RFC1226"
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Network Working Group B. Kantor | Network Working Group B. Kantor | ||
Request for Comments: 1226 Univ. of Calif San Diego | Request for Comments: 1226 Univ. of Calif San Diego | ||
| − | + | May 1991 | |
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| − | + | Internet Protocol Encapsulation of AX.25 Frames | |
| − | Status of this Memo | + | '''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 | ||
| − | + | 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 | 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 Considerations | ||
| − | + | Security issues are not discussed in this memo. | |
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Author's Address | 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: [email protected] | |
Latest revision as of 13:57, 16 October 2020
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.
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: [email protected]
