Why does wlan1 not get a static IP?

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http://unix.stackexchange.com – I have a Raspberry Pi with two USB wlan adapters. wlan0 is configured with DHCP and wlan1 is configured with a static IP address. But wlan1 never gets it's IP address after boot and the network does not work properly. Any clues to why? /etc/network/interfaces looks like this: auto lo iface lo inet loopback iface default inet dhcp auto eth0 allow-hotplug eth0 iface eth0 inet static address netmask auto wlan0 allow-hotplug wlan0 iface wlan0 inet manual wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf auto wlan1 iface wlan1 inet static address netmask (HowTos)