Reduce tx power

Hi to all

Is it possible to set the trasmission power to a value lower than 1 mW (0 dBm) ? If the answer is no, why. Is there a phyisical limit in the chip or is just a driver limit?

I'm trying to simulate a large wireless mesh network using machines that are close toghether, so now every machine has the complete "visibility" of the network. My goal is to limit the visibility to only a subset of nodes. I can not move the machines, and the drivers that I'm using are ath5k.

Bye

Giuseppe Siracusano

I don't know about ath5k, but in usb8388 firmware (libertas driver) there is a blinding table, into which MAC addresses were inserted, so that the firmware would simulate test conditions.

Without a blinding table, sometimes nodes with minimal transmit power, distance, and shielding, could still be reached. RF sometimes works better than you want.

James Cameron
http://quozl.linux.org.au/

At least in the mac80211 11s mesh implementation (and thus available with ath5k), the equivalent is plink block, which restricts peering between neighbors:

 $ iw mesh0 station set <MAC address> plink_action block

Bob Copeland %% www.bobcopeland.com

Thanks to all for the replies!!

In the previous mail I'forgot to say that I've already implemented a solution based on mac filtering, but in this case the same wireless channel would be shared among different "virtual" visibility scopes and the emulation is less realistic.

I'd like to compare this solution to a second one where the nodes do not share the same channel, and then chose the one that fits my experiment's requisites.

bye

Giuseppe Siracusano