<br><br><div><span class="gmail_quote">On 12/29/06, <b class="gmail_sendername">Jouni Malinen</b> <<a href="mailto:jkmaline@cc.hut.fi">jkmaline@cc.hut.fi</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Fri, Dec 29, 2006 at 06:45:25PM -0600, Sriram Chadalavada wrote:<br><br>> We are trying to measure the Effective Isotropic Radiated Power(EIRP) of<br>> few prism3 based compact flash wireless cards running on an embedded target
<br>> with hostap 0.3.8. For this purpose we need to have the cards transmitting<br>> without being associated to an access point. Probe requests sent as part of<br>> an active scan should be sufficient.<br><br>Setting the card in Host AP mode would make it send out periodic beacon
<br>frames on one channel which could be even easier for this..</blockquote><div><br>Yes. That very well might work but I am more inclined to use the cards in station/client mode since that is how they will be deployed in the production environment.
<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">> If I use the 'iwlist wlan0 scan' command, does the card firmware perform an
<br>> active scan with probe requests or does it simply perform a passive scan of<br>> the values already obtained from AP beacons?<br><br>This may depend on the firmware and regulatory configuration.. Should be<br>
easy to figure out with a wireless sniffer, though. </blockquote><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">> >From the hostap README, I came to know of the 'iwpriv wlan0 host_scan <x>'
<br>> command which performs an active scan. Does this work even in the default<br>> firmware roaming mode?<br><br>Maybe, if you have new enough firmware.</blockquote><div> <br>We are using STA firmware rev 1.7.4 on one card and
1.8.3 on the other and the cards are FCC approved for use in the US.<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">> Also, is there a way I can restrict the active scan to be performed only in
<br>> one channel at a time? Please let me know.<br><br>iwpriv wlan0 scan_channels <bitmask><br><br></blockquote></div><br>I do not remember seeing this option in the README for 0.3.8 release (actually I don't see it in the latest README as well). Nevertheless, will give it a shot.
<br><br>Cheers,<br>Sriram<br>