Date: Wed, 03 Sep 2008 11:23:49 -0700 From: Sam Leffler <sam@freebsd.org> To: Pietro Cerutti <gahr@freebsd.org> Cc: freebsd-hackers@freebsd.org, Matthias Apitz <matthias.apitz@oclc.org> Subject: Re: WPA && associating with unknown SSID Message-ID: <48BED635.5010100@freebsd.org> In-Reply-To: <48BEB687.5050308@FreeBSD.org> References: <20080903113131.GA8697@rebelion.Sisis.de> <48BEA791.6030406@freebsd.org> <48BEB687.5050308@FreeBSD.org>
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Pietro Cerutti wrote:
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> Sam Leffler wrote:
> | 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).
>
> Not necessarily. If you bring up a wlan interface and don't specify
> anything, it will automatically associate with the first open AP it
> finds.
>
> I don't know if it's to be considered a feature or a bug. I've been
> worried by this sometimes, but honestly not enough to really care..
>
> Anyway, it happens...
>
He was talking about wpa_supplicant selecting an arbitrary AP. If you
have a device marked up then the system will handle ap selection+join
but if wpa_supplicant is running then it marks the interface in "manual
roaming mode" which stops that behaviour.
Sam
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