KVM network with Public IP addresses


I have miniONE installation and 2 public networks.
So, 1st network is /29 and 2nd is /27.
Also, physical server have 2 gigabit links (1st is for host OS, and 2nd for VMs)
So if I add public /27 network to bridged virtual network I cannot ping outside any IP that assigned to VM.

Please help me to configure virtual network on my host.