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Date:      Fri, 06 Mar 1998 20:16:48 -0600
From:      David Kelly <dkelly@hiwaay.net>
To:        Haider Roland VAI/TAW2 <HaiderRo@linz.vai.co.at>, freebsd-questions@FreeBSD.ORG
Subject:   Re: AX.25 Kernel patch for FreeBSD? 
Message-ID:  <199803070216.UAA15408@nospam.hiwaay.net>
In-Reply-To: Message from Doug White <dwhite@gdi.uoregon.edu>  of "Thu, 05 Mar 1998 22:00:21 PST." <Pine.BSF.3.96.980305215924.24994K-100000@gdi.uoregon.edu> 

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Doug White writes:
> 
> One major problem is that the X.25 code has been removed from the kernel.
> If you want to experiment with this you'll have to fetch it and plug it
> back into the kernel.

AX.25 started as X.25 but expanded the address field from 8 bits to 8
bytes. I believe a lot of work also was applied to various protocol
timers to deal with very slow RF networks (300 and 1200 baud is common)
and slow-to-key radios. Am not sure the removed X.25 code would have 
been of any use but for reading material.

The AX.25 protocol spec is available from http://www.tapr.org/ in PDF 
format.

You can do AX.25 in user space, much like PPP, with TNOS. TNOS 2.22 used
to compile cleanly on FreeBSD, I know because I provided the patches to
the author. I didn't keep up with TNOS 2.30 so it has a couple of
gotchas and a heavy Linux bent. TNOS can be had from 
http://www.lantz.com and ftp://ftp.ucsd.edu/. Hint: download the Linux
binaries too, that's the only way you'll get the entire runtime
directrory structure TNOS requires. Maybe one day I'll submit a FreeBSD
port to eliminate the configure and compile hassles. Even better, maybe
someone will beat me to the port.

--
David Kelly N4HHE, dkelly@nospam.hiwaay.net
=====================================================================
The human mind ordinarily operates at only ten percent of its
capacity -- the rest is overhead for the operating system.



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