[B.A.T.M.A.N.] [PATCH] batman-adv: introduce "noflood" broadcast flood prevention option

Sven Eckelmann sven at narfation.org
Sun Apr 28 19:04:40 CEST 2019

On Friday, 26 April 2019 19:12:31 CEST Linus Lüssing wrote:
> With DAT DHCP snooping, the gateway feature and multicast optimizations
> in place in some scenarios broadcast flooding might not be strictly
> necessary anymore to be able to establish IPv4/IPv6 communication.
> Therefore this patch adds an option to disable broadcast flooding.
> Larger mesh networks typically filter a variety of multicast packets via
> ebtables/netfilter to clamp on overhead. With this option such firewall
> rules can be relaxed so that such multicast packets are only dropped
> if they cannot be handled by multicast-to-unicast, for instance.
> "noflood" comes in two flavours: If set to 1 then flood prevention is
> enabled for all multicast/broadcast packets except ICMPv6 and IGMP
> (cautious mode). Or, if set to 2 then flood prevention is enabled for
> all multicast/broadcast packets (aggressive mode). If set to 0 then
> flood prevention is disabled.
> "noflood" is disabled by default as there are still some things to take
> care of to avoid breaking things (especially for the "aggressive mode").
> Signed-off-by: Linus Lüssing <linus.luessing at c0d3.blue>

@Martin, I think you've started to experiment with this noflood feature. Any 
experiences which you can share with us?

Kind regards,
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