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x25.txt

x25.txt 2.0 KB
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  1. Linux X.25 Project
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  2. 

  3. As my third year dissertation at University I have taken it upon myself to
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  4. write an X.25 implementation for Linux. My aim is to provide a complete X.25
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  5. Packet Layer and a LAPB module to allow for "normal" X.25 to be run using
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  6. Linux. There are two sorts of X.25 cards available, intelligent ones that
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  7. implement LAPB on the card itself, and unintelligent ones that simply do
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  8. framing, bit-stuffing and checksumming. These both need to be handled by the
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  9. system.
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  10. 

  11. I therefore decided to write the implementation such that as far as the
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  12. Packet Layer is concerned, the link layer was being performed by a lower
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  13. layer of the Linux kernel and therefore it did not concern itself with
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  14. implementation of LAPB. Therefore the LAPB modules would be called by
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  15. unintelligent X.25 card drivers and not by intelligent ones, this would
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  16. provide a uniform device driver interface, and simplify configuration.
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  17. 

  18. To confuse matters a little, an 802.2 LLC implementation for Linux is being
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  19. written which will allow X.25 to be run over an Ethernet (or Token Ring) and
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  20. conform with the JNT "Pink Book", this will have a different interface to
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  21. the Packet Layer but there will be no confusion since the class of device
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  22. being served by the LLC will be completely separate from LAPB. The LLC
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  23. implementation is being done as part of another protocol project (SNA) and
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  24. by a different author.
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  25. 

  26. Just when you thought that it could not become more confusing, another
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  27. option appeared, XOT. This allows X.25 Packet Layer frames to operate over
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  28. the Internet using TCP/IP as a reliable link layer. RFC1613 specifies the
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  29. format and behaviour of the protocol. If time permits this option will also
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  30. be actively considered.
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  31. 

  32. A linux-x25 mailing list has been created at vger.kernel.org to support the
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  33. development and use of Linux X.25. It is early days yet, but interested
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  34. parties are welcome to subscribe to it. Just send a message to
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  35. majordomo@vger.kernel.org with the following in the message body:
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  36. 

  37. subscribe linux-x25
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  38. end
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  39. 

  40. The contents of the Subject line are ignored.
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  41. 

  42. Jonathan
    43. 

  43. 

  44. g4klx@g4klx.demon.co.uk
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  45.