Question on adding/deleting multicast routes

[Alex Gonzalez <langabe@xxxxxxxxx>]

Hi,

I have an application listening on a multicast socket. The multicast
stream is always present on the wire, to avoid getting confused by
IGMP. If I add a multicast route and then start the application
everything works fine. However, if I first start the application and I
then add a multicast route, the traffic is not seen.

Similarly, after adding the route and starting the application, if I
then remove the route the application still sees the stream.

I have tried flushing the routes cache but the behaviour seems not to
be affected by the cache. Also, restarting the networking service
doesn't help. Restarting the application works, I guess because the
sockets are reopened.

Is there a way to have the addition/deletion of routes have effect
without having to reopen the sockets?

Thanks,
Alex
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