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1 | Linux X.25 Project |
2 | |
3 | As my third year dissertation at University I have taken it upon myself to |
4 | write an X.25 implementation for Linux. My aim is to provide a complete X.25 |
5 | Packet Layer and a LAPB module to allow for "normal" X.25 to be run using |
6 | Linux. There are two sorts of X.25 cards available, intelligent ones that |
7 | implement LAPB on the card itself, and unintelligent ones that simply do |
8 | framing, bit-stuffing and checksumming. These both need to be handled by the |
9 | system. |
10 | |
11 | I therefore decided to write the implementation such that as far as the |
12 | Packet Layer is concerned, the link layer was being performed by a lower |
13 | layer of the Linux kernel and therefore it did not concern itself with |
14 | implementation of LAPB. Therefore the LAPB modules would be called by |
15 | unintelligent X.25 card drivers and not by intelligent ones, this would |
16 | provide a uniform device driver interface, and simplify configuration. |
17 | |
18 | To confuse matters a little, an 802.2 LLC implementation for Linux is being |
19 | written which will allow X.25 to be run over an Ethernet (or Token Ring) and |
20 | conform with the JNT "Pink Book", this will have a different interface to |
21 | the Packet Layer but there will be no confusion since the class of device |
22 | being served by the LLC will be completely separate from LAPB. The LLC |
23 | implementation is being done as part of another protocol project (SNA) and |
24 | by a different author. |
25 | |
26 | Just when you thought that it could not become more confusing, another |
27 | option appeared, XOT. This allows X.25 Packet Layer frames to operate over |
28 | the Internet using TCP/IP as a reliable link layer. RFC1613 specifies the |
29 | format and behaviour of the protocol. If time permits this option will also |
30 | be actively considered. |
31 | |
32 | A linux-x25 mailing list has been created at vger.kernel.org to support the |
33 | development and use of Linux X.25. It is early days yet, but interested |
34 | parties are welcome to subscribe to it. Just send a message to |
35 | majordomo@vger.kernel.org with the following in the message body: |
36 | |
37 | subscribe linux-x25 |
38 | end |
39 | |
40 | The contents of the Subject line are ignored. |
41 | |
42 | Jonathan |
43 | |
44 | g4klx@g4klx.demon.co.uk |
45 |
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v2.6.34-rc5
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