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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
-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 separate 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. RFC1613 specifies the
-format and behaviour of the protocol. If time permits this option will also
-be actively considered.
-A linux-x25 mailing list has been created at to support the
-development and use of Linux X.25. It is early days yet, but interested
-parties are welcome to subscribe to it. Just send a message to with the following in the message body:
-subscribe linux-x25
-The contents of the Subject line are ignored.