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Question about Packet Sniffer

Sasha Kalmanovich
Intellectual 840 points

I am using a sniffer to capture a communication between a USB dongle and a keyfob.

I understand that the two sides establish an access address that identifies the communication between them.

Is there a way in the sniffer to know WHICH SIDE  is sending the information ?

(When I see the packets I have no way of knowing who is the sender and who is the recevier, except if I know in advance what each side should send)

Thanks,

Sasha.

 

  • 0
    TI__Genius 17975 points

    During a connection, the master always transmits first at each connection event. In the image below I circled the packets from each connection event. The way to know that it is a new connection event is because the channel has changed since the last packet. The master transmits first, and then the slave. Note that it is possible to have more than one packet in each direction at each connection event if there is data being sent (the example below only has one packet each way for each event).

     

  • 0 in reply to Willis1
    Prodigy 10 points

    hallo,

    i have a question for you,

    i started to use packet snifer, i follow the user guide, and it is perfectly worked.

    in the user guide, it is only for channel 38,

    i want to ask how to setup the connection to get the result like yours.

    i mean, in your picture, the channel was changed since the last packets.

    i'm working on project report.

    thanks for your help.