Hi All,
What exactly is this:
IGMP Multicast memberships
Multicast Group Address 
239.255.0.1 
239.255.255.250 
224.0.0.251 
I'm curious.
I did find this:
IGMP Multicast memberships 
If IGMP is enabled, this area of the screen shows all multicast groups of which any LAN devices are members. 
And also saw this:
Multicast Streams
Enable Multicast Streams :  checked.
I thought Enable Multicast Streams was for programs like Windows Live Messenger and Windows Media Player.