Re: local multicast routing

[Brian Haley <brian.haley@xxxxxx>]

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.

-Brian
--
To unsubscribe from this list: send the line "unsubscribe linux-net" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html