I have a server with 6 NICs installed and is running Ubuntu 12.04LTS. I want to setup 4 guest VMs using kvm. Now I want to assign 2 NICs for the host(1 Public IP and 1 private IP), and 1 NIC each to 4 guest VM(all private IP). How do I do this?

/etc/network/interfaces

I am having trouble with my configuration file shown below:

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
    address 192.168.1.109
    netmask 255.255.255.0
    gateway 192.168.1.5

auto eth1
iface eth1 inet static
        address 192.168.1.117
        netmask 255.255.255.0

auto eth2
iface eth2 inet manual

auto br0
iface br0 inet static
        address 192.168.1.118
        netmask 255.255.255.0
        bridge_ports eth2
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off

auto eth3
iface eth3 inet manual

auto br1
iface br1 inet static
        address 192.168.1.119
        netmask 255.255.255.0
        bridge_ports eth3
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off

auto eth4
iface eth4 inet manual

auto br2
iface br2 inet static
        address 192.168.1.123
        netmask 255.255.255.0
        bridge_ports eth4
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off

auto eth5
iface eth5 inet manual

auto br3
iface br3 inet static
        address 192.168.1.124
        netmask 255.255.255.0
        bridge_ports eth5
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off