WPA && associating with unknown SSID

[Sam Leffler]

Matthias Apitz wrote:
> Hello,
>
> I'm using WPA to connect to my various Wifi AP's (office, home, partner
> locations) and have them well configured in the wpa_supplicant.conf(5)
> file;
>
> from time to time at home I encounter that it is associating with an
> unknown AP of my neighbourhood:
>
>
> # ifconfig iwi0
> iwi0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         ether 00:13:ce:a1:e6:81
>         inet 192.168.2.3 netmask 0xffffff00 broadcast 192.168.2.255
>         media: IEEE 802.11 Wireless Ethernet autoselect (DS/11Mbps)
>         status: associated
>         ssid o2DSL_kJaR channel 1 (2412 Mhz 11g) bssid 00:19:cb:86:b3:84
>         authmode OPEN privacy ON deftxkey 1 wepkey 1:40-bit bmiss 10
>         scanvalid 60 bgscan bgscanintvl 300 bgscanidle 250 roam:rssi11g 7
>         roam:rate11g 5 protmode CTS roaming MANUAL
> # ifconfig iwi0 list scan
> SSID            BSSID              CHAN RATE   S:N     INT CAPS
> o2DSL_kJaR      00:19:cb:86:b3:84    1   54M  19:0    100 EP  
> xxxxxxxxxxxx    00:14:6c:44:aa:f6   11   54M  13:0    100 EP   WPA
>
> the network with SSID 'o2DSL_kJaR' is not im my
> /etc/wpa_supplicant.conf;
>
> how this is possible and how can I prevent this?
>   
You must have a wildcard entry in your wpa_supplicant.conf file (i.e. 
one w/o an ssid specified).

    Sam