darkstat shown blocked traffic

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http://unix.stackexchange.com – I've installed Darkstat on a Qemu VM which is connected to a bridge interface on top of main server's interface ( eth0 ) In Darkstat report I can see many hosts in the same IP range of specified VMs are transferring packets with VM while I've blocked all of them in forward chain of Iptables, Any one familiar with this kind of issue? any advise on how can that packets bypassing the Iptables? (HowTos)