How to do a UDP multicast across the local network in c#?

Question

I am trying to get some simple UDP communication working on my local network.

All i want to do is do a multicast to all machines on the network

Here is my se

Answer 1

Does your local network hardware support IGMP?

It's possible that your switch is multicast aware, but if IGMP is disabled it won't notice if any attached hardware subscribes to a particular multicast group so it wouldn't forward those packets.

To test this, temporarily connect two machines directly together with a cross-over cable. That should (AFAICR) always work.

Also, it should be the server half of the code that has the TTL argument supplied to JoinMulticastGroup(), not the client half.