C# Networking help - Raw Sockets for IGMP

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I'm pretty new to Windows programming (but not programming in
general). I'm trying to write a program that will generate IGMP
packets where I can control all of the payload in the packet but I'm
unclear as to how to do that. It looks like I need to create a socket
of SocketType.Raw and ProtocolType.IGMP. But after that I'm stumped.
What data do I/can I shove into the packet itself and how do I set the
recipient multicast address?

Thanks in advance for any insight any of you can shed on this.

George
.

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