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This add support for IGMP Snooping on atheros switches (disabled by default), which avoids flooding the network with multicast data. Tested on TL-WDR4300: disabling IGMP Snooping results in multicast flooding on each specific port, enabling it back again prevents each port from receiving all multicast packets. Partially based on: http://patchwork.ozlabs.org/patch/418122/ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 48268