Nullrouting a KVM guest from the node

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http://serverfault.com – I have a "development" KVM server here at the office, setup in a bridged networking setup with a few KVM guests running on it. For each KVM guest a virtual interface is created on the node with the name kvm[id].0 e.g. kvm126.0 when the guest boots. Yesterday I was playing around and wanted to see how I could nullroute a KVM guest in case I needed to. So I tried route add ip_address reject which had no effect, as no effect had route add ip_address gw lo or ip route add blackhole ip_address/32. Since it's a bridged network setup, I get why the above didn't work. Next try was with ip (HowTos)