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if your NIC ( eth0) of the KVM (VM) is on the host device br0,and you want to see all the network traffics,

what you can do is:

on the hosting machine

brctl setageing <bridgename> 0


this will turn the bridge like a HUB

The reason is:   setting the ageing of the bridge to 0 , so it basically never has a list of learnt MAC addresses , thus forcing it to transmit the packets regardless of whether the destination is connected via that port or not.



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