Specifying what network interface an UDP multicast should go to in .NET

Question

On a computer with both an active Wireless Card and a LAN-Port with a crossover cable hooked up to another machine running the same application, we need to send a UDP multicast over the LAN wire to the other computer. Using C# Sockets, Windows seems to try to route the message over the WLAN adapter every time.

Is there a way to specify what network interface to send a UDP multicast on?

Answer 1

You are probably looking for SocketOptionName.MulticastInterface. Here's an article on MSDN that might help you.

Other then that if you update your local routing table to have an exact entry matching the multicast address and pointing to the right interface it should just work.