Hm, hostap+sta channel information isn't always correctly propagated

[Bernhard Schmidt]

On Fri, Sep 30, 2011 at 10:21, Adrian Chadd <adrian.chadd at gmail.com> wrote:
> As part of trying to replicate what Ed's seeing, I did this:
>
> ifconfig wlanX create wlandev ath1 ssid TESTX up
> for wlan 0 .. 3. It picked a DFS channel and started the DFS CAC machinery.
>
> Then I created a sta interface on wlan4 and it did some scanning, then
> selected channel 1.
> This is what I ended up with:
>
> adrian-home-mips# ifconfig wlan0
> wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>        ether 00:c0:ca:1a:6c:d4
>        media: IEEE 802.11 Wireless Ethernet autoselect mode 11g <hostap>
>        status: running
>        ssid TEST channel 52 (5260 MHz 11a) bssid 00:c0:ca:1a:6c:d4
>        regdomain FCC3 country US ecm authmode OPEN privacy OFF txpower 30
>        mcastrate 6 mgmtrate 6 scanvalid 60 wme burst dtimperiod 1
> adrian-home-mips# ifconfig wlan1
> wlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>        ether 00:c0:ca:1a:6c:d4
>        media: IEEE 802.11 Wireless Ethernet autoselect mode 11g <hostap>
>        status: running
>        ssid TEST2 channel 52 (5260 MHz 11a) bssid 00:c0:ca:1a:6c:d4
>        regdomain FCC3 country US ecm authmode OPEN privacy OFF txpower 30
>        mcastrate 6 mgmtrate 6 scanvalid 60 wme burst dtimperiod 1
> adrian-home-mips# ifconfig wlan2
> wlan2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>        ether 00:c0:ca:1a:6c:d4
>        media: IEEE 802.11 Wireless Ethernet autoselect mode 11g <hostap>
>        status: running
>        ssid TEST2 channel 52 (5260 MHz 11a) bssid 00:c0:ca:1a:6c:d4
>        regdomain FCC3 country US ecm authmode OPEN privacy OFF txpower 30
>        mcastrate 6 mgmtrate 6 scanvalid 60 wme burst dtimperiod 1
> adrian-home-mips# ifconfig wlan3
> wlan3: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>        ether 00:c0:ca:1a:6c:d4
>        media: IEEE 802.11 Wireless Ethernet autoselect mode 11g <hostap>
>        status: running
>        ssid TEST3 channel 52 (5260 MHz 11a) bssid 00:c0:ca:1a:6c:d4
>        regdomain FCC3 country US ecm authmode OPEN privacy OFF txpower 30
>        mcastrate 6 mgmtrate 6 scanvalid 60 wme burst dtimperiod 1
> adrian-home-mips# ifconfig wlan4
> wlan4: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>        ether 00:c0:ca:1a:6c:d4
>        media: IEEE 802.11 Wireless Ethernet DS/1Mbps mode 11g
>        status: associated
>        ssid CACHEBOY_DAGLISH channel 1 (2412 MHz 11g) bssid 00:25:86:d8:7c:da
>        regdomain FCC3 country US ecm authmode WPA2/802.11i privacy ON
>        deftxkey UNDEF TKIP 2:128-bit txpower 30 bmiss 7 scanvalid 450 bgscan
>        bgscanintvl 300 bgscanidle 250 roam:rssi 7 roam:rate 5 protmode CTS
>        wme burst roaming MANUAL
>
> Shortly after this, I did a manual scan and it seemed to disconnect
> from the ssid for some reason and reassociate again. Now all of the
> hostap interfaces show up on the right channel.
>
> They were tx'ing beacons on channel 1; it's just that the BSS state
> hadn't been updated.
>
> Hm!

Do you know if CAC has been stopped/deferred as soon as you 'up'ed the
STA interface? Doing a scan and CAC at the same is certainly not
possible on a single physical interface.

-- 
Bernhard