On Dec 5, 2016, at 7:27 AM, Weber, Patrick <[email protected]>
wrote:
>
> Thanks for the response. Is there a non-default way (via C++ API) to select
> the NIC/IP address? My application may use multicast for other purposes (Web
> service discovery, for example), and I need to have it active on each NIC.
These services must use different addresses, which gives you the opportunity to
route them separately.
I suggest that you use the default rule Ross recommended for the “best”
interface for multicast, then add additional routes with lower metrics (see the
netstat/route(8) manual page) for the exceptions.
For example, let’s say you have IPTV going out on 239.255.{0-3}.x and you
wanted it to go out the 1.2.3.4 interface. Let’s further say you have the
224/4 route on the 2.3.4.5 interface with metric 10. You could then say:
route add 239.255.0.0/22 1.2.3.4 metric 9
That causes the network stack’s routing layer to prefer sending IPTV multicast
packets out the 1.2.3.4 NIC while everything else goes out 2.3.4.5.
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