#1405 NORM Opportu: Forwarding of packets in the mesh by the wireless should be able to be filtered by IP multicast group.

[Zarro Boogs per Child]

#1405: Forwarding of packets in the mesh by the wireless should be able to be
filtered by IP multicast group.
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  Reporter:  jg           |       Owner:  marcelo    
      Type:  enhancement  |      Status:  new        
  Priority:  normal       |   Milestone:  Opportunity
 Component:  wireless     |     Version:             
Resolution:               |    Keywords:             
  Verified:  0            |  
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Changes (by gnu):

  * verified:  => 0


Comment:

 Every Ethernet/802.x Linux device driver already tells the hardware what
 multicast addresses is it interested in listening to.  The hardware
 guarantees that packets for that set of addresses will come through its
 multicast filter.  (Cheaper devices also let other multicast packets
 through, that you didn't ask for.  E.g. sometimes the hardware hashes the
 destination address down to say 64 buckets, and set an internal bit for
 any bucket that contains an address the kernel is interested in.  Packets
 whose destinations hash to the same bucket might arrive and need to be
 discarded by software.  All that stuff has worked in Linux for years.)

 "/sbin/ip maddrs" will list all the addresses that the kernel has
 currently told each device.  So that part of the work is already done --
 this feature just requires mesh firmware work.

-- 
Ticket URL: <http://dev.laptop.org/ticket/1405#comment:1>
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