auto lo
iface lo inet loopback

iface eth0 inet static
        pre-up /etc/firewall-openvpn-rules.sh
address 192.168.168.81
netmask 255.255.255.0
gateway 192.168.168.1

auto wlan0
allow-hotplug wlan0
iface wlan0 inet manual     <------- be sure this says manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

iface home inet static      <------- the "home" here has to match whatever the id_str variable is in wpa conf
address 192.168.168.80      <------- i went static, but suppose you could go DHCP as well -- change it in line above this
gateway 192.168.168.1
netmask 255.255.255.0

iface default inet dhcp