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Added some readme info about Wireshark, extcap, and DLTs.

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skarg
2017-08-24 19:16:45 +00:00
parent 0c39a8edaf
commit 4599d725f6
1 changed files with 14 additions and 1 deletions
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bacnet-stack/demo/mstpcap/mstpcap.txt
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@@ -195,4 +195,17 @@ Locate the extcap search path.
Copy the mstpcap.exe to that folder, which may not exist. Copy the mstpcap.exe to that folder, which may not exist.
Restart Wireshark, and look for "BACnet MS/TP on COMx" interfaces. Restart Wireshark, and look for "BACnet MS/TP on COMx" interfaces.
Configure the interface to change baud rate. Configure the interface to change baud rate.
Capture directly from the interface. Capture directly from the interface.
==== Developer Info about Wireshark ExtCap ====
BACnet MS/TP uses a DLT (data link type) requested from and
approved by libPCAP development team, which is 165. Wireshark
includes a dissector that decodes the MS/TP packets when they
use the DLT for MS/TP. Other DLTs exist for other types, and
there are also DLTs set aside as USER DLTs.
See the following URLs for information about ExtCap:
https://github.com/wireshark/wireshark/blob/master/doc/README.extcap
https://github.com/wireshark/wireshark/blob/master/doc/extcap_example.py
https://wiki.wireshark.org/Development/Extcap