Proper use of bind() for multicast receive on Linux

I'm trying to use a socket to receive multicast packets from a specific multicast group sent to a specific port and would like to clarify the correct address to use for bind(). The man pages typically discuss bind() in the context of unicast but not so much for the special case of multicast.

I understand that because multiple processes can listen on the same port for multicast, the use of SO_REUSEADDR is usually prescribed. For bind(), I think it's clear that the port to use is the destination port. However, what's not so clear is the address. I see in multiple examples the use of INADDR_ANY for bind. (e.g. http://ift.tt/1aUfY8V & http://ift.tt/1LWOxwq)

However, my experience has been that this way of calling bind() results in receiving unwanted packets, but if I use the multicast group address for bind(), the problem goes away. I have another process concurrently listening to other multicast groups on the same port and I think the current process gets them too because of the indiscriminate use of INADDR_ANY.

So, I would like to confirm whether the multicast group address is the correct address to bind() in my case, like this:

// Don't do this: // bindaddr.sin_addr.s_addr = htonl(INADDR_ANY); // Do this instead: bindaddr.sin_addr = mcastGroupAddr; // Then bind(). if (bind(sockFd, reinterpret_cast<sockaddr*>(&bindaddr), sizeof(bindaddr))) return -1; 

If this is not the correct address to bind(), what should I use?