auto lo
iface lo inet loopback
auto eth0
#real IP adress
iface eth0 inet static
address 192.168.1.252
netmask 255.255.255.0
gateway 192.168.1.254
auto vmbr0
#private sub network
iface vmbr0 inet static
address 10.10.10.1
netmask 255.255.255.0
bridge_ports none
bridge_stp off
bridge_fd 0
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up iptables -t nat -A POSTROUTING -s '10.10.10.0/24' -o eth0 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o eth0 -j MASQUERADE
other
auto lo
iface lo inet loopback
auto vmbr0
iface vmbr0 inet static
address 192.168.1.253
netmask 255.255.255.0
bridge_ports eth0
bridge_stp off
bridge_fd 0
auto eth1
iface eth1 inet static
address 192.168.1.1
netmask 255.255.255.0
gateway 192.168.1.254
auto vmbr1
iface vmbr1 inet static
address 10.10.10.1
netmask 255.255.255.0
bridge_ports none
bridge_stp off
bridge_fd 0
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up iptables -t nat -A POSTROUTING -s '10.10.10.0/24' -o eth1 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o eth1 -j MASQUERADE
