Re: SNA

Christopher Horn (chorn@warwick.net)
Fri, 10 Sep 1999 21:00:51 -0400

Regarding the LLC stuff, I think Tim Alpaerts wrote the original
implementation that Alan Cox integrated into the kernel. Tim and Roger
Bowler have since done some additional work on it, and Roger added a
DLPI user interface for it. These patches were apparently not accepted
into the kernel as Jay Schulist had rewritten the LLC layer as part of
his Linux-SNA project. As Jay has now gone commercial with his code
through ICE networking, and the code no longer appears to be available
under the GPL, it does not appear any of it is going to be folded into
the mainstream kernel anytime soon. So I'm not sure where that leaves
things at the moment in terms of us ever having a free SNA
implementation for Linux.

Roger Bowler has also implemented a 3270 Gateway on top of the LLC
patches. I have not had time to play with any of it yet, but hope too
sometime next month. This is all available on his site, see
http://www.snipix.freeserve.co.uk/linux.html for some of this stuff and
some other odds and ends.

Cheers,
Chris

jonathan.naylor@socgen.com wrote:
>
> Hello Folkert
>
> > Anyone working on an SNA protocol stack for Linux?
> > Yeah, I know about that Ice-product, but the mainframe
> > costed a ton, can't afford their product now.
>
> There was. A fellow in Belgium had started to write a stack
> to support LU2 3270 sessions to allow terminal access to his
> mainframe. The 802.2 LLC code in the kernel is part of his
> work. However it was never finished because they installed
> TCP/IP on the mainframe and he was able to TELNET into it,
> maybe using x3270 I forget. That was all about two years ago.
> Unfortunately I haven't got his name or e-mail address handy.
>
> > Oh, and if nobody's working on such a thing; is there
> > any documentation on where to start when implementing
> > a protocol-stack? I guess I should add things to net/ and
> > update the protocols.c/Makefile, but after that I get
> > stuck :-)
> > Any help (also like "look at that stack; it's so simple and
> > basic, it's a good start") is welcome!
>
> I would suggest the nearest protocol in the existing stacks is
> X.25, a VC based protocol. For my sins I wrote it originally,
> maybe a clone and modification of that stack would be the
> easiest path, certainly X.25 is closer to SNA than (say) TCP/IP.
>
> > Thanks in advance,
> > Folkert van Heusden
>
> Feel free to chat about it with me on e-mail.
>
> > p.s. send a copy of your reply since I'm not on this
> > list - the traffic is waaaay to high :-/
>
> Will do.
>
> Jonathan
>
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