root@:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eno1
iface eno1 inet dhcp
#iface eno1 inet dhcp

iface eno2 inet manual

#auto vmbr0
#iface vmbr0 inet dhcp
#       bridge-ports eno1
#       bridge-stp off
#       bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address 10.0.0.1
        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 10.0.0.0/24 -o eno1 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s 10.0.0.0/24 -o eno1 -j MASQUERADE