Routing multicast traffic in Vista multi-homed setup

If you run any NT-based system with multiple networks and want to receive multicast traffic on an interface other than the default one, you might want to perform a few commands in the command line.

The problem with Windows NT, unlike Unix-like OSs, is that it can't route multicast traffic like other.

So if you have something like

Network Destination        Netmask          Gateway       Interface  Metric
        224.0.0.0        240.0.0.0         On-link      10.100.17.17    266
        224.0.0.0        240.0.0.0        10.0.17.1       10.0.17.17    276

in your routing table and you want to get multicast from 10.0.17.1 instead of 10.100.17.1, you should run

route -p add 224.0.0.0 mask 240.0.0.0 10.0.17.1 if 8 metric 1

where "if" should be the interface number corresponding to 10.0.17.17 and "metric" should be anything less than metric of the route on 10.100.17.17 interface (the non preferred one).

P.S. This technique allowed me to use the IPTV with 99 sat channels that my other ISP provides instead of 18 I have with my primary and I'm pretty happy with that :)