Unable to capture wireless traffic

[Ng <ngchorsyn () yahoo com sg>]

Trying to learn wireshark and have been trying/reading for weeks with success.
Netbook and Desktop connected to the same router with wpa2.

Wireshark on netbook works when monitoring its own traffic (of course).

Netbook installed with wireshark and desktop set downloading a large file to ensure traffic is there. However, 
wireshark does not picks up TCP protocol , it only reports IEEE802 under the protocol column.

what have I done wrong?

appreciate any help.




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