source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

iface lo inet6 loopback

auto enp0s31f6
iface enp0s31f6 inet manual
        up route add -net 95.xxx.xxx.64 netmask 255.255.255.192 gw 95.xxx.xxx.65 dev enp0s31f6

auto vmbr0
iface vmbr0 inet static
        address  95.xxx.xxx.12
        netmask  xx
        gateway  95.xxx.xxx.65
        bridge-ports enp0s31f6
        bridge-stp off
        bridge-fd 0

iface vmbr0 inet6 static
        address  2a01:4f9:2b:2586::2
        netmask  64
        gateway  fe80::1



auto vmbr1
iface vmbr1 inet static
      address 192.168.111.1
      netmask 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 ‘192.168.111.0/24’ -o vmbr0 -j MASQUERADE
      post-down iptables -t nat -D POSTROUTING -s ‘192.168.111.0/24’ -o vmbr0 -j MASQUERADE