iptables and wireless card in promiscuous mode

[Claudio Lavecchia <Claudio.Lavecchia@eurecom.fr>]

Hello People,

I have a little question:

I have two laptops that have 802.11 wireless cards. I am developing some 
application that essentially perform sniffing functions using wireless 
cards in promiscuous mode. To test my code, I need those two laptops not 
to "see" each other (--> I do not want the wireless card of laptop A, 
which is operating in promiscuous mode to process packets coming from 
laptop B) and I tought to do it using iptables. so on laptop A i added 
the following rule:

iptables -A INPUT -mac --mac-source MAC_ADDRESS_LAPTOP_B -j DROP

and on laptop B I added the rule:

iptables -A INPUT -mac --mac-source MAC_ADDRESS_LAPTOP_A -j DROP

I just executed my first tests and the feeling  I got is that, for 
example, the wlan card of  laptop B still passes through the packet 
coming from laptop A.

Can anyone confirm  this analysis? If I am right, can anyone give me a 
hint to possibly workaround this?

Thank you very much

Claudio