wlan/lan and multicast

Hi everyone,
I'm brand new to the list so excuse me if this is a repeat, eventhough I was 
searching the archive for quite a while.
OK, my question is the following :
I have 2 interfaces, one WLAN and one LAN connected to the same network 
130.230.50.0, so they have the same gateway (130.230.50.1).
Is it possible to receive multicast address i.e 239.252.10.1 from wlan0 and 
i.e 239.252.12.1 from eth0 at the same time ??
I tried and so far couldn't get it work. When both interface are up at the 
same time, multicast will only be received on the interface that first went 
up.
Of course, to do that I used the route command (i.e route add -host 
239.252.10.1 dev wlan0, etc ... eth1)

My wlan interface is ipw2100.

thanks very much for any help
adrian
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