Documentation/networking/x25.txt - kernel/mindspeed - Git at Google

 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
	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