patch-2.1.16 linux/Documentation/networking/x25.txt

• Lines: 39
• Date: Wed Dec 18 11:45:43 1996
• Orig file: v2.1.15/linux/Documentation/networking/x25.txt
• Orig date: Thu Jan 1 02:00:00 1970

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+Linux X.25 Project
+
+As my third year dissertation at University I have taken it upon myself to
+write an X.25 implementation for Linux. My aim is to provide a complete X.25
+Packet Layer and a LAPB module to allow for "normal" X.25 to be run using
+Linux. There are two sorts of X.25 cards available, intelligent ones that
+implement LAPB on the card itself, and unintelligent ones that simply do
+framing, bit-stuffing and checksumming. These both need to be handled by the
+system.
+
+I therefore decided to write the implementation such that as far as the
+Packet Layer is concerned, the link layer was being performed by a lower
+layer of the Linux kernel and therefore it did not concern itself with
+implementation of LAPB. Therefore the LAPB modules would be called by
+unintelligent X.25 card drivers and not by intelligent ones, this would
+provide a uniform device driver interface, and simplify configuration.
+
+To confuse matters a little, an 802.2 LLC implementation for Linux is being
+written which will allow X.25 to be run over an Ethernet (or Token Ring) and
+conform with the JNT "Pink Book", this will have a different interface to
+the Packet Layer but there will be no confusion since the class of device
+being served by the LLC will be completely seperate from LAPB. The LLC
+implementation is being done as part of another protocol project (SNA) and
+by a different author.
+
+Just when you thought that it could not become more confusing, another
+option appeared, XOT. This allows X.25 Packet Layer frames to operate over
+the Internet using TCP/IP as a reliable link layer. An RFC exists that
+specifies the format and behaviour of the protocol. If time permits this
+option will also be actively considered.
+
+It is hoped that a linux-x25 mailing list will be opened soon to allow for
+the discussion of Linux X.25, but it hasn't appeared yet.
+
+Jonathan
+
+jsn@cs.nott.ac.uk
+g4klx@g4klx.demon.co.uk