Правильная конфигурация:
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 115.162.91.174
netmask 255.255.255.240
gateway 115.162.91.161
network 115.162.91.160
broadcast 115.162.91.175
dns-nameservers 8.8.8.8 8.8.4.4
auto eth0:1
iface eth0:1 inet static
address 115.162.91.165
netmask 255.255.255.240
auto eth0:2
iface eth0:2 inet static
address 115.162.91.167
netmask 255.255.255.240
auto lxc-br-nat
iface lxc-br-nat inet static
address 10.0.2.1
netmask 255.255.255.0
network 10.0.2.0
broadcast 10.0.2.255
dns-nameservers 8.8.8.8 8.8.4.4
pre-up brctl addbr lxc-br-nat
post-down brctl delbr lxc-br-nat
bridge_stp off
bridge_fd 0
Соответственно, должен стоять пакет bridge-utils и разрешен форвардинг пакетов в ядре net.ipv4.ip_forward = 1.
