Ethereal-dev: Re: [ethereal-dev] LAPB/X.25 patch

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From: Richard Sharpe <sharpe@xxxxxxxxxx>
Date: Tue, 03 Aug 1999 16:30:03 +0900
At 22:28 2/08/99 -0700, Guy Harris <gharris@xxxxxxxxxxxx> wrote:
>> Perhaps it's set by one of the Set Mumble Mumble Mode Extended commands?
>> I.e., perhaps the connection starts off in basic mode, and one side
>> sends something like Set Asynchronous Balanced Mode Extended to tell the
>> other side that they should both run modulo 128?
>
>...and
>
>	http://www.blackbox.nl/techweb/protocol/x25.htm
>
>says:
>
>	The CONTROL field is initialized with a Set Asynchronous
>	Balanced Mode (SABM).  There is also an extended operation
>	(SABME) that provides a modulo-128 frame window.  LAPB is a
>	full-duplex mode of operation.

Hmmm, NetBEUI uses SABME, but looks remarkably like X.25 apart from that.

I am not sure if it uses a modulo-128 window size, but probably does.

Anyway, seems like the two protocols share a lot ...

Regards
-------
Richard Sharpe, sharpe@xxxxxxxxxx, NS Computer Software and Services P/L,
Samba (Team member www.samba.org), Ethereal (Team member www.zing.org)
Co-author, SAMS Teach Yourself Samba in 24 Hours