> I suspect that for people who want to do multicast between hosts on an
> actual wire won't want to have just a route to lo, they may want a route
> for 224.0.0.0/4 on all of their interfaces.  Maybe that should be
> automatic?
>
> I think that applications that are multicast aware are supposed to
> figure out which interfaces that they want to bind to anyway, so they
> should not be confused by the multiple routes.

If I remember things right (I might be wrong here):

ipv6 does this automatically, so should ipv4 have done too if multicast is
supported on a device. Multicast aware programs should always bind to a
device, or broadcast on all devices for discovery.

This is not uml-specific, but vanilla kernel. Some distroes add
multicast-routing for ipv4 during init scripts.


Stian


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