Route Private IP to Public IP using dual NIC host setup/KVM

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http://serverfault.com – I have the following KVM setup: Host(Centos 6.3) eth0(br0) -> Public IP (156.x.x.x) eth1(br1) -> Private IP ( ip_forwarding enable Guest VMs(Centos 6.3) eth0 bridge to br0 -> Private IP ( Now, I can ping the host eth0 ip & eth1 ip but I cannot access the internet/outside host 156.x.x.x aside from the eth0 of host, anything I need to setup? (HowTos)