passive scan / monitoring on multiple channels

hello.

I have two problems or let's say questions about the usage of the wireless
tools in conjunction <http://www.dict.cc/englisch-deutsch/conjunction.html>
with <http://www.dict.cc/englisch-deutsch/with.html> the madwifi driver. I
am using openWRT on a box with atheros cards. when I perform a "iwlist ath0
scan" I lose connectivity for a few seconds (I can especially tell because I
do all this by SSHing to the box through that card). I assume this is
because iwlist scan performs an active scan, hence has to switch through the
channels to be able to send corresponding probe requests. however I though
that a card should be able to receive beacons (=passive scan) without losing
connectivity -- I don't lose connectivity when I scan for available networks
with my macbook.. how can such a scan be done? or am I completely wrong
here?
further, if such a scan is possible, i.e. a card is able to receive beacons
from any channel whilst no loosing connectivity, could it also receive other
(=data) packets without disconnecting, e.g. some kind of all-channel monitor
mode? the reason why I'm asking is because I try to monitor the activity of
some channels and I don't want to disconnect the clients while I do so.

can anyone offer some help on this?
thanks
matt

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