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

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From: Guy Harris <guy@xxxxxxxxxx>
Date: Fri, 23 May 2003 16:56:10 -0700
On Fri, May 23, 2003 at 05:38:35PM +0100, CNS - Matthew Bradley wrote:
> I've done some more investigation. The protocol is an ICL (a brand now
> subsumed into Fujitsu) protocol called OSLAN (try a Google search on OSLAN
> protocol). OSLAN is, as Dave was describing, TP4 over 802.3; I don't know
> about the null CLNP stuff.

As Martin noted, the null CLNP stuff is in there, so it's TP over a null
network layer, and it's actually running over 802.2 LLC running over
802.3.

> We'd love to have this working in Ethereal.

Ask somebody at Fujitsu whether OSLAN had 802.2 LLC SAPs of hex 14 and
54 assigned to it, in which case the way to get it to work in Ethereal
would be to change it to treat SAPs of 14 and 54 as CLNP, or if it
somehow dynamically chose the SAPs to use, in which case the only way to
get Ethereal to support it would either be to

	1) figure out some way to heuristically determine whether
	   traffic is OSLAN or not

or to 

	2) add support for LLC SAPs to the "Decode As..." dialog and
	   require that the user of Ethereal explicitly tell Ethereal to
	   decode packets as CLNP based on their SAP.