i experienced instability of ath* (wi* works fine) in certain
	environment.  ath* cannot associate itself with the basestations,
	it sometimes can, but "ifconfig ath0" says "status: no network"
	all the time.  i'm not sure how to debug/feedback this, but the
	environment is available all the time so i can test it easily.

	using IBM a/b/g minipci card.

itojun


access points visible by empty nwid (i don't want to associate with them):

itojun[starfruit:~] SU wiconfig wi0 -D
scanning ....
AP Information
ap[0]:
        netname (SSID):                 [  ]
        BSSID:                          [ 00:60:1d:1c:4e:4b ]
        Channel:                        [ 6 ]
        Quality/Signal/Noise [signal]:  [ 41 / 95 / 54 ]
                                [dBm]:  [ 41 / -54 / -95 ]
        BSS Beacon Interval [msec]:     [ 100 ]
        Capinfo:                        [ ESS ]
ap[1]:
        netname (SSID):                 [  ]
        BSSID:                          [ 00:02:2d:40:a1:20 ]
        Channel:                        [ 6 ]
        Quality/Signal/Noise [signal]:  [ 9 / 63 / 54 ]
                                [dBm]:  [ 9 / -86 / -95 ]
        BSS Beacon Interval [msec]:     [ 100 ]
        Capinfo:                        [ ESS WEP ]


the basestation i would like to associate with (they do not advertise SSID):

itojun[starfruit:~] SU wiconfig wi0 -D
scanning ....
AP Information
ap[0]:
        netname (SSID):                 [ UTnet-CC4F ]
        BSSID:                          [ 00:60:1d:1c:4e:4b ]
        Channel:                        [ 6 ]
        Quality/Signal/Noise [signal]:  [ 44 / 99 / 55 ]
                                [dBm]:  [ 44 / -50 / -94 ]
        BSS Beacon Interval [msec]:     [ 100 ]
        Capinfo:                        [ ESS ]
ap[1]:
        netname (SSID):                 [ UTnet-CC4F ]
        BSSID:                          [ 00:07:85:b3:da:be ]
        Channel:                        [ 11 ]
        Quality/Signal/Noise [signal]:  [ 10 / 64 / 54 ]
                                [dBm]:  [ 10 / -85 / -95 ]
        BSS Beacon Interval [msec]:     [ 100 ]
        Capinfo:                        [ ESS ]