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46 lines
2.0 KiB
46 lines
2.0 KiB
.. SPDX-License-Identifier: GPL-2.0 |
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================== |
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Linux X.25 Project |
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================== |
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As my third year dissertation at University I have taken it upon myself to |
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write an X.25 implementation for Linux. My aim is to provide a complete X.25 |
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Packet Layer and a LAPB module to allow for "normal" X.25 to be run using |
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Linux. There are two sorts of X.25 cards available, intelligent ones that |
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implement LAPB on the card itself, and unintelligent ones that simply do |
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framing, bit-stuffing and checksumming. These both need to be handled by the |
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system. |
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I therefore decided to write the implementation such that as far as the |
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Packet Layer is concerned, the link layer was being performed by a lower |
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layer of the Linux kernel and therefore it did not concern itself with |
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implementation of LAPB. Therefore the LAPB modules would be called by |
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unintelligent X.25 card drivers and not by intelligent ones, this would |
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provide a uniform device driver interface, and simplify configuration. |
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To confuse matters a little, an 802.2 LLC implementation is also possible |
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which could allow X.25 to be run over an Ethernet (or Token Ring) and |
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conform with the JNT "Pink Book", this would have a different interface to |
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the Packet Layer but there would be no confusion since the class of device |
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being served by the LLC would be completely separate from LAPB. |
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Just when you thought that it could not become more confusing, another |
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option appeared, XOT. This allows X.25 Packet Layer frames to operate over |
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the Internet using TCP/IP as a reliable link layer. RFC1613 specifies the |
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format and behaviour of the protocol. If time permits this option will also |
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be actively considered. |
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A linux-x25 mailing list has been created at vger.kernel.org to support the |
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development and use of Linux X.25. It is early days yet, but interested |
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parties are welcome to subscribe to it. Just send a message to |
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[email protected] with the following in the message body: |
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subscribe linux-x25 |
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end |
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The contents of the Subject line are ignored. |
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Jonathan |
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[email protected]
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