[Live-devel] Groupsock doesn't bind to Multicast Address

[Ross Finlayson]

>I am relatively new user to the Live Media library. In our 
>application, we would like to bind to a multicast address in 
>addition to binding to the local port number. This is so that we 
>*only* receive packets destined for a given Multicast address & port 
>combination and prevent other datagrams destined for that same port 
>from being deliverd to our socket.

This is often an operating system issue.  Some OSs work the way you 
want; others do not.

>// change imr.imr_interface.s_addr = ReceivingInterfaceAddr; to following:
>
>if (IN_MULTICAST(ntohl(ReceivingInterfaceAddr))) {
>     // Bound to MULTICAST Address, so use INADDR_ANY as the i/f address
>     imr.imr_interface.s_addr = INADDR_ANY;
>   }
>   else {
>     // Bound to UNICAST Address, so use this address as the i/f address
>     imr.imr_interface.s_addr = ReceivingInterfaceAddr;
>   }

This is bogus, because the default value of "ReceivingInterfaceAddr" 
*is* INADDR_ANY.  I.e., you'll get the same effect as your proposed 
change if you don't set "ReceivingInterfaceAddr" at all.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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