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source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

iface lo inet6 loopback

auto enp4s0
iface enp4s0 inet static
        address 78.46.177.76/27
        gateway 78.46.177.65
        up route add -net 78.46.177.76 netmask 255.255.255.224 gw 78.46.177.65 dev enp4s0
        post-up sysctl -w net.ipv4.ip_forward=1
        post-up iptables -t nat -A PREROUTING -i enp4s0 -p tcp -m multiport ! --dport 22,8006 -j DNAT --to 192.168.1.1
        post-up iptables -t nat -A PREROUTING -i enp4s0 -p udp -j DNAT --to 192.168.1.1
# route 78.46.177.76/27 via 78.46.177.65

iface enp4s0 inet6 static
        address 2a01:4f8:121:4c9::2/64
        gateway fe80::1

iface eth0 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.1.0/24
        bridge-ports none
        bridge-stp off
        bridge-fd 0
        post-up iptables -t nat -A POSTROUTING -s '192.168.1.1/24' -o enp4s0 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '192.168.1.1/24' -o enp4s0 -j MASQUERADE

auto vmbr1
iface vmbr1 inet manual
        ovs_type OVSBridge