Dear all,

 

Here I have a very detailed question and I would like to thank you all for
your help in advance. 

 

Some background information first:

 

Thunder is a very popular P2P file downloading software in China and it is
not open sourced. Recently I have been doing some protocol analysis
experiments about Thunder by Wireshark. Experiment descriptions are as
follows:

 

Experiment 1 :  Close other applications and run Thunder------I will get a
lot of packets with the protocol name as OICQ. (OICQ is a very popular IM
soft ware in china but actually during this experiment I did not open it).

 

Experiment 2:  keeping all other setting unchanged, I  close Thunder,
immediately after experiment 1---------Here I did not get any OICQ packets
anymore.

 

Actually I have talk to some guys who work in OICQ company and according to
them, Thunder and OICQ are competitors and there are not any co-operations
between them.  So I am really confused that how I can capture OICQ packets
from Thunder while the OICQ is not running.  Therefore, if it is possible,
may I ask how  Wireshark works and decide a packet is an OICQ packet? I
mean, besides of the UDP port, are there any other ways for Wireshark to
categorise a packet to be an OICQ packet?

 

Actually I am really confused here and your help will be really appreciated
for me.

 

Thank you in advance and best regards,

 

Adele JIA

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