Configure IPTables on KVM host to block guest bridge traffic

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http://serverfault.com – I am working on a thesis research project, and I am having some difficulty figuring out how to get iptables (running on the KVM host) to block traffic (or rather, manipulate traffic) destined for a BRIDGED KVM guest. I am unable to get the iptables entries (pasted below) to block traffic to and from the VM's. Effectively, I would like my host system to act as a firewall for those guest VM's, and for the time being, I would like to test this capability by simply dropping all packets that is destined for a specific VM. In the not-so-distant future, I would also like to implement more granular (HowTos)