Help with Sending/ Receiving UDP packets - C Sockets

Question

Ok, if you look at some of my previous questions, I\'ve been working on getting a simple connection up and running with C sockets (I\'m still fairly new to the whole network

Answer 1

Is there a router between you and your destination? If so, there's some work that needs to be done to tell the router that you want to subscribe to the feed as well as tell the router you will be sending the feed.

I would start by tcpdump-ing the connection to make sure the packet is leaving your machine first.

Answer 2

In the listener, I think you need to set

listeningMc_req.imr_interface.s_addr = htonl(INADDR_ANY);

... since that is also the interface on which you bind the socket. Depending on whether you run everything on a single host, you might need to consider the loopback interface and binding to INADDR_ANY will do that.