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Wireshark-users: Re: [Wireshark-users] Setting up a display offset

From: "Luis EG Ontanon" <luis.ontanon@xxxxxxxxx>
Date: Tue, 24 Jul 2007 18:26:39 +0200
do
	local unk_proto = Proto("unk","Unknown");
	unk_proto.fields = { }

	local eth_dis = Dissector.get("eth_withoutfcs") -- your next protocol
dissector here

	function unk_proto.dissector(tvb,pinfo,tree)
		tree:add(unk_proto,buf(0,34)) -- your offset here!
		eth_dis:call(tvb(34):tvb(),pinfo,tree)
	end
	
	DissectorTable.get("ethertype"):add(0x1234,unk_proto) -- your type here
end


On 7/24/07, Frank Bulk <frnkblk@xxxxxxxxx> wrote:




It would be good for the community if this particular case was tackled.
More generically, I've seen a few requests about decoding captures that have
specific offsets, perhaps this something that needs to be tackled, too.



Regards,



Frank





From: wireshark-users-bounces@xxxxxxxxxxxxx
[mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of
Bill Halvorsen (bhalvors)
 Sent: Saturday, July 21, 2007 7:26 AM
 To: wireshark-users@xxxxxxxxxxxxx
 Subject: [Wireshark-users] Setting up a display offset





I am using a feature called Cable Intercept on a Cisco CMTS, it packages up
traffic between two endpoints into a udp wrapper and sends it to a machin
where its collected using wireshark,





To view the origianl packet I need to setup an offset of 58 bytes to view
the original IP packet.





How can I do this?



Bill

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