auto lo
iface lo inet loopback

auto enp4s0
iface enp4s0 inet dhcp

auto vmbr0
iface vmbr0 inet static
        address 10.0.0.1/24
        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 enp4s0 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '10.0.0.0/24' -o enp4s0 -j MASQUERADE

iface wlp5s0 inet manual

source /etc/network/interfaces.d/*