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Wireshark-dev: [Wireshark-dev] X.25, LAPB, PLP Decoding

Date: Mon, 18 Jun 2007 10:46:02 -0400

Hi,

I’ve been making Protocol Analyzer based on Sangoma S5142A synch serial card and WireShark. Capturing of X.25 LAPB and PLP layers is done by Sangoma card/driver. Storing into file is done by socket based code. File format is libpcap file format.

 

I’ve seen that WireShark  ( wtap)  has decoder for LAPB and PLP layers of the original X.25.

 

Problem is that libpcap “DLT_    “ definitions doesn’t have value for LAPB link layer. So, when I opened captured file by WireShark, I can see only raw data.

 

I think that I should define proprietary “DLT_LAPB” value and do whatever necessary steps in wtap (WireShark) in order to recognize my DLT_LAPB type form libpcap file header. After that I should be able to see LAPB frames and PLP packets in the WireShark.

 

Is above story about new DLT_LAPB and wtap extension is correct?

 

 

Regards

 

Mirko Karanovic.

Toronto Transit Comission


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