Configure Wifi (hidden SSID) on Raspbian (EDIMAX Wifi Adapter)

Question

I have trouble connecting to the wifi network with my Raspberry Pi (Raspbian Wheezy) in combination with EDIMAX EW-7811UN Wireless USB Adapter.

I already used this combination to connect to my parents wifi (WPA with a non-hidden wifi) successfully.

/etc/network/interfaces

auto lo

iface lo inet loopback

iface eth0 inet static
address 192.168.2.128
netmask 255.255.255.0
gateway 192.168.2.1

auto wlan0
allow-hotplug wlan0

iface wlan0 inet static
address 192.168.2.128
netmask 255.255.255.0
gateway 192.168.2.1

wpa-ap-scan 1
wpa-ap-ssid 1
wpa-ssid "<SSID>"
wpa-psk "<PASS>"

My own wifi has the following configuration:

• hidden SSID
• TKIP+AES (WPA/WPA2) with PSK authentication

So I generated a PSK version of my wifi password:

$ wpa_passphrase "<SSID>" "<PASS>"

And configured these two files:

/etc/network/interfaces

auto lo

iface lo inet loopback
iface eth0 inet dhcp

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp

wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

iface default inet dhcp

and /etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
   ssid="<SSID"
   psk=<PSK>
   proto=WPA2
   key_mgmt=WPA_PSK
   pairwise=CCMP
   group=CCMP
   auth_alg=OPEN
}

The USB Adapter and its module are working fine (lsusb, lsmod). And as I said, I already used the Raspberry Pi to connect to a network. But it does not seem work with the configuration I use at my own home. I get an "Network unreachable" error if I try to ping my router.

Resetting the Raspberry Pi is not an option, because I already put a lot of effort in its configuration.

Does anybody have a simular configuration with his own Raspberry Pi or knows how to solve this (I already googled and tried different "solutions" for hours without any success).

Thank you, Freddi

Solution 1

I finally found my answer here (sorry, it is german): Raspberry Pi, Edimax EW-7811Un and a hidden wifi

# /etc/network/interfaces
allow-hotplug wlan0
auto wlan0
iface wlan0 inet dhcp
wpa-ap-scan 1
wpa-scan-ssid 1
wpa-ssid "SSID"
wpa-proto RSN
wpa-pairwise CCMP
wpa-key-mgmt WPA-PSK
wpa-psk "PASS"

Solution 2

I think you forgot in the first aproach adding

scan_ssid=1

to the network block in wpa_supplicant.conf to make the network work with hidden ssid.

From the docs:

scan_ssid
     SSID scan technique; 0 (default) or 1. Technique 0 scans for the
     SSID using a broadcast Probe Request frame while 1 uses a
     directed Probe Request frame. Access points that cloak them-
     selves by not broadcasting their SSID require technique 1, but
     beware that this scheme can cause scanning to take longer to com-
     plete.