Re: Wpa_gui and multiple access points

["Julian H. Stacey" <jhs%berklix.com@localhost>]

Hi, Reference:
> From:         Ottavio Caruso <ottavio2006-usenet2012%yahoo.com@localhost> 
> Date:         Mon, 2 Dec 2013 15:05:46 +0000 

Ottavio Caruso wrote:
> On 2 December 2013 14:48, Julian H. Stacey <jhs%berklix.com@localhost> wrote:
> > I see uou are only specifying
> >         ssid="Visitors_XXXXXXXXX"
> > & you are not specifying bssid, so whatever is selecting a bssid
> > is perhaps picking up an access point at random perhaps at low
> > signal strength far away ?
> 
> That was automatically generated by wpa_gui. I didn't even touch the
> configuration file.
> Now that I've added two more peers, I have replicated entries:
> 
> bash-4.2# cat /etc/wpa_supplicant.conf
> ctrl_interface=/var/run/wpa_supplicant
> ctrl_interface_group=wheel
> update_config=1
> 
> 
> network={
>         ssid="Visitors"
>         key_mgmt=NONE
>         auth_alg=OPEN
>         disabled=1
> }
> 
> network={
>         ssid="Visitors"
>         key_mgmt=NONE
>         auth_alg=OPEN
>         disabled=1
> }
> 
> network={
>         ssid="Visitors"
>         key_mgmt=NONE
>         auth_alg=OPEN
> 
> Notice the "disabled=1"

Interesting, I don't have 'disabled' as a keyword in list of parameters
in man wpa_supplicant.conf on FreeBSD-10.0-BETA4

> > I suggest you do
> >         ifconfig wlan0 scan
> > then manually select a high power signal (They are the ones with
> > the smaller numbers in the S of the S:N columns).
> 
> Shouldn't that be the ones with the highest numbers?

No, because I assume with a column marked S:N, that its a normal scenario of
signal to noise ratio, logarithmic,
negative here (as often rel to 0 dbm = 1mW ?  my memory vague :-)
so a smaller number is a more powerful signal 
(roughly doubles each 3.1 db (decibels) I recall, ie 2 ^ ( 3 x 3.1or_so ) = 10.

With ifconfig wlan0 scan
You can also see on S:N columns that the background noise levels
(right N column ) are a lot smaller than the signal levels (left S column)

Cheers,
Julian
-- 
Julian Stacey, BSD Unix Linux C Sys Eng Consultant, Munich http://berklix.com
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