About promiscuous mode

[l0he1g () 126 com]

 HI,
    I'm a college student,now I'm programing a small sniffer use pcaplib.when I put into promiscuous mode as:
                         handle=pcap_open_live(dev,SNAP_LEN,1,1000,errbuf);
it only can receive packets post from or sent to me,cannot inercept any packets from others who is in the same 
LAN(Ethernet).My os is linux,but their are Windows.Does this has any matter?And what should I to if I want to 
capture all packets in my LAN?
    thank you!
 
Regards,
        l0he1g
  


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