Ethereal-users: Re: [Ethereal-users] ISO8073 OSI COTP over Ethernet

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From: Guy Harris <gharris@xxxxxxxxx>
Date: Tue, 27 May 2003 03:54:26 -0700
On Tue, May 27, 2003 at 11:41:19AM +0100, CNS - Matthew Bradley wrote:
> I've spoken to one of our suppliers who lives and breathes OSLAN.
> 
> He says that ICL were the only company in the world to choose LLC SAP 0x54
> for their mainframes, and he suggested this was a unilateral decision. My
> contact's experience is that all OSLAN hosts other than ICL mainframes
> normally use a SAP 0x14. 
> 
> So I fear that it will not be possible to identify OSLAN based on LLC alone.

Well, if neither a SAP value of 0x14 or of 0x54 is used for anything
*other* than OSLAN, then OSLAN traffic can be identified based on LLC
alone as traffic for SAP 0x54 *or* SAP 0x14.

Is it the case that 14 and 54 are both used for OSLAN and nothing else?