1 .. SPDX-License-Identifier: GPL-2.0 2 3 ================== 4 Linux X.25 Project 5 ================== 6 7 As my third year dissertation at University I have taken it upon myself to 8 write an X.25 implementation for Linux. My aim is to provide a complete X.25 9 Packet Layer and a LAPB module to allow for "normal" X.25 to be run using 10 Linux. There are two sorts of X.25 cards available, intelligent ones that 11 implement LAPB on the card itself, and unintelligent ones that simply do 12 framing, bit-stuffing and checksumming. These both need to be handled by the 13 system. 14 15 I therefore decided to write the implementation such that as far as the 16 Packet Layer is concerned, the link layer was being performed by a lower 17 layer of the Linux kernel and therefore it did not concern itself with 18 implementation of LAPB. Therefore the LAPB modules would be called by 19 unintelligent X.25 card drivers and not by intelligent ones, this would 20 provide a uniform device driver interface, and simplify configuration. 21 22 To confuse matters a little, an 802.2 LLC implementation is also possible 23 which could allow X.25 to be run over an Ethernet (or Token Ring) and 24 conform with the JNT "Pink Book", this would have a different interface to 25 the Packet Layer but there would be no confusion since the class of device 26 being served by the LLC would be completely separate from LAPB. 27 28 Just when you thought that it could not become more confusing, another 29 option appeared, XOT. This allows X.25 Packet Layer frames to operate over 30 the Internet using TCP/IP as a reliable link layer. RFC1613 specifies the 31 format and behaviour of the protocol. If time permits this option will also 32 be actively considered. 33 34 A linux-x25 mailing list has been created at vger.kernel.org to support the 35 development and use of Linux X.25. It is early days yet, but interested 36 parties are welcome to subscribe to it. Just send a message to 37 majordomo@vger.kernel.org with the following in the message body: 38 39 subscribe linux-x25 40 end 41 42 The contents of the Subject line are ignored. 43 44 Jonathan 45 46 g4klx@g4klx.demon.co.uk
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