Multicast filtering

Hi all,

I am running redhat 7.x and using the rtl8139 driver which came in the 
package.

I am having trouble with the multicast filtering. My card does not seem do 
any filtering (i check this with a tcpdump). The scyld website says that 
8139 supports multicast filtering. 

My recv uses 225.0.0.37 port 6400.
 
When try sending with 225.1.1.0, 225.124.34.128, etc and in all these 
cases the filtering does not work.  

Could someone tell me what i am missing here.

Thanks in advance.

Karthik.