auto lo
iface lo inet loopback

# LAN
iface nic0 inet manual
# WAN
iface nic1 inet manual

# opnsense LAN
auto vmbr0
    iface vmbr0 inet static
    address 192.168.100.51/24
    gateway 192.168.100.1
    bridge-ports nic0
    bridge-stp off
    bridge-fd 0
    bridge-mcsnoop 0

# opnsense WAN
auto vmbr1
    iface vmbr1 inet dhcp
    bridge-ports nic1
    bridge-stp off
    bridge-fd 0
    bridge-mcsnoop 0

source /etc/network/interfaces.d/*