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Linus Lüssing authored
Next to snooping IGMP/MLD queries RFC4541, section 2.1.1.a) recommends to snoop multicast router advertisements to detect multicast routers. Multicast router advertisements are sent to an "all-snoopers" multicast address. To be able to receive them reliably, we need to join this group. Otherwise other snooping switches might refrain from forwarding these advertisements to us. Signed-off-by:
Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by:
David S. Miller <davem@davemloft.net>
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