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Wireshark capture only packet from and to my PC when in promiscuous mode

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http://askubuntu.com – I've installed Wireshark and configured it to let my user run it with all needed privileges (I enabled dumpcap and added my user to wireshark group, then restarted). Devices are shown and capture starts well. The problem is that only packets sent to and directed to the PC where Wireshark is running are captured. Obviously I enabled Promiscuous mode in the capture options dialog. For example, if I run Wireshark and then surf the web on Firefox, packets are captured. If I start browsing with my smartphone, instead, no packet is captured (PC and smartphone are connected to the same domestic WiF (HowTos)