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 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 vger.kernel.org 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
  majordomo@vger.kernel.org with the following in the message body:
  
  subscribe linux-x25
  end
  
  The contents of the Subject line are ignored.
  
  Jonathan
  
  g4klx@g4klx.demon.co.uk