Re: [PATCH] make ipv4 multicast packets only get delivered to sockets thatare joined to group

[David Stevens]

netdev-owner@xxxxxxxxxxxxxxx wrote on 09/13/2006 07:13:55 AM:

> Only
> the socket that is bound to the group address to which the packet was
> sent should get it.

        This is not true on any OS I'm aware of, including the
original sockets multicast implementation on early BSD.

        Multicast group membership is per-interface, not per-socket.
Joining a group on any socket on the machine allows packets for that
group to be delivered on the interface where it was joined.

Delivery of packets to a socket is determined by the binding, and
INADDR_ANY means "any".

IPv6 behaves the same way.
                                                                +-DLS


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