Received signal strength

Vinayak Naik naik
Tue Aug 17 19:05:54 PDT 2004

On Tue, 17 Aug 2004, Vinayak Naik wrote:

Hi Denis,

Its an excellent utility!!! I tested it with linux-2.4.20. It works :-)

Since I am using handheld running linux-2.4.19, I tried to compile
hostap-0.2.4 + sensitivity patch for it. But it turns out hostap-0.2.4 is
not compatible with linux-2.4.19.

So I used hostap-0.1.3 alongwith sensitivity modifications in
hostap_ioctl.c and hostap_wlan.c, and compiled them for linux-2.4.19. I
have attached the modofied hostap_ioctl.c file to this email. It
worked, but the output of iwconfig is a bit screwed up. Here it is:

sh-2.03# iwconfig
 lo        no wireless extensions.

 eth0      no wireless extensions.

 Warning: Driver for device wlan0 has been compiled with version 14
 of Wireless Extension, while this program is using version 16.
 Some things may be broken...

 wlan0     IEEE 802.11b  ESSID:"test"  Nickname:"stargate-41"
           Mode:Ad-Hoc  Frequency:2.422GHz  Cell: 02:04:BB:75:4B:10
           Bit Rate:2Mb/s   Sensitivity=0/242700000
           Retry min limit:8   RTS thr:off   Fragment thr:off
           Encryption key:off
           Power Management:off
           Link Quality:0/1  Signal level:-69 dBm  Noise level:-90 dBm
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:0   Missed beacon:0

 Note the value of sensitivity. If I issue command "iwconfig wlan0 sens
 17", the output changes to Sensitivity:17/242700000. That's what I meant
 by it worked.

 I was wondering whether you have a version of your sensitivity patch for
 hostap-0.1.3, that would be great!



> On Sat, 14 Aug 2004, Denis Vlasenko wrote:
> > On Saturday 14 August 2004 09:02, Vinayak Naik wrote:
> > > I have a question regarding received signal strength threshold value
> > > reported by iwconfig command.
> > >
> > > The output of the iwconfig says "Sensitivity=1/3". What does it translate
> > > into watts?
> >
> > Hell knows. hostap has rudimentary support for setting sensitivity,
> > which does not seem to work. At least I was unable to see any effect
> > from setting it to any value.
> >
> > I made a pache which implements working sensitivity control,
> > but it wasn't accepted (maybe Jouni simply missed it).
> >
> > I can rediff/resend it if anybody interested.
> > --
> > vda
> >

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