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1.. SPDX-License-Identifier: GPL-2.02 3==================4Linux X.25 Project5==================6 7As my third year dissertation at University I have taken it upon myself to8write an X.25 implementation for Linux. My aim is to provide a complete X.259Packet Layer and a LAPB module to allow for "normal" X.25 to be run using10Linux. There are two sorts of X.25 cards available, intelligent ones that11implement LAPB on the card itself, and unintelligent ones that simply do12framing, bit-stuffing and checksumming. These both need to be handled by the13system.14 15I therefore decided to write the implementation such that as far as the16Packet Layer is concerned, the link layer was being performed by a lower17layer of the Linux kernel and therefore it did not concern itself with18implementation of LAPB. Therefore the LAPB modules would be called by19unintelligent X.25 card drivers and not by intelligent ones, this would20provide a uniform device driver interface, and simplify configuration.21 22To confuse matters a little, an 802.2 LLC implementation is also possible23which could allow X.25 to be run over an Ethernet (or Token Ring) and24conform with the JNT "Pink Book", this would have a different interface to25the Packet Layer but there would be no confusion since the class of device26being served by the LLC would be completely separate from LAPB.27 28Just when you thought that it could not become more confusing, another29option appeared, XOT. This allows X.25 Packet Layer frames to operate over30the Internet using TCP/IP as a reliable link layer. RFC1613 specifies the31format and behaviour of the protocol. If time permits this option will also32be actively considered.33 34A linux-x25 mailing list has been created at vger.kernel.org to support the35development and use of Linux X.25. It is early days yet, but interested36parties are welcome to subscribe to it. Just send a message to37majordomo@vger.kernel.org with the following in the message body:38 39subscribe linux-x2540end41 42The contents of the Subject line are ignored.43 44Jonathan45 46g4klx@g4klx.demon.co.uk47