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batman-adv: introduce 'no_rebroadcast' option
This patch introduces a new sysfs option named "no_rebroadcast" on a per hard interface basis. It allows manually enabling a split-horizon like behaviour for the layer 2 multicast payload frames, in that incoming multicast payload frames on such a hard interface are only being rebroadcasted on all interfaces except the incoming one instead of being rebroadcasted on all interfaces. Such an option should only be enabled if you are certain that these rebroadcasts are unnecessary. This is usually the case for instance for point-to-point wifi longshots or wired links. This option can especially safe a significant amount of upload overhead if the neighbourhood on a link is rather large, for instance in some transitive, symmetric VPN configurations. Using this option wrongly will break your mesh network, use this option wisely and at your own risk! Signed-off-by: Linus Lüssing <email@example.com>
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