Ethereal-dev: Re: SV: [Fwd: [Ethereal-dev] 3G Signaling patch]

Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.

Date Index Thread Index Other Months All Mailing Lists
Date Prev Date Next Thread Prev Thread Next
From: Guy Harris <gharris@xxxxxxxxx>
Date: Tue, 04 Oct 2005 02:00:30 -0700
Guy Harris wrote:
Unfortunately, having atm_guess_lane_type() check for 802.3 frames by checking the type/length field as if it's a length field, and set the traffic type to something other than LANE if it doesn't look like an 802.3 frame, means that
1) Ethernet frames with a type field don't get recognized as LANE frames
A heuristic that checks for packets that look like signalling packets might work better - if the signalling is Q.2931, then checking for 09 xx xx xx xx {Q.2931 message type} might work. (There don't appear to be a lot of known Ethernet types in the 0x09xx range.) The byte after the protocol discriminator is the call reference length, so the heuristics might also check for small values in the second byte.