Re: local multicast routing

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Matt Garman wrote:
> Say I have two multicast programs running on the same machine.  One
> is a sending program, and one is a receiving program.  The receiving
> program has joined the group to which the sender in sending.
> How does the Linux kernel route these packets?  I.e., are the
> packets just pushed out to the switch for routing, or is the kernel
> smart enough to do some "local delivery" and directly deliver
> packets to the listener?

Multicast packets are always looped-back by default in Linux.  You
can turn this behavior off by setting the IP_MULTICAST_LOOP socket
option to zero.

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