I have an PI2 with an USB WiFi adapter, and want to set it up with both wifi and fallback to LAN cable, but can't make it work.
Is there something wrong with my setup... When I boot with the LAN cable attached, it works great, with both interfaces, wired, also when i detach the LAN cable, the wifi works fine.. But if i boot without LAN cable, it will not bring up the wlan0 interface ..
auto lo iface lo inet loopback auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.0.14 netmask 255.255.255.0 gateway 192.168.0.1 dns-nameservers 192.168.0.1 auto wlan0 allow-hotplug wlan0 iface wlan0 inet static address 192.168.0.15 netmask 255.255.255.0 gateway 192.168.0.1 dns-nameservers 192.168.0.1 wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf