From: philip+usenet@paeps.cx   
      
   Martijn Lievaart  wrote:   
   > On Fri, 22 May 2009 00:00:44 +0200, Pascal Hambourg wrote:   
   > > Good point, but this feature of the "subnet broadcast" does not seem to   
   > > have been considered useful enough, because it does not exist any more in   
   > > IPv6 : there is no "prefix multicast" address (IPv6 replaced all broadcast   
   > > with multicast), only an "all nodes" link local multicast address, ff02::1   
   > > received by all nodes on a link.   
   >   
   > Sorry for hijacking this thread, but does that mean that you have to   
   > specify an interface in ipv6 to do a link local broad/multi-cast?   
      
   Yes.  Though there is no "broadcast" in IPv6.  You always need to specify an   
   interface when trying to reach a link-local address.  Reason being that it is   
   quite possible for the same link-local address to exist on different links.   
      
   > In ipv4 there is no such concept (local extensions possible), you send to   
   > the broadcast address for a subnet, the ip stack figures out where to send   
   > the broadcast.   
   >   
   > Or in other words, what happens when you send to ff02::1?   
      
   Depending on your network stack, you'll get a more or less meaningful error.   
   BSD network stacks tell you "network unreachable".  If you specify the   
   interface, you'll get responses from all nodes on the segment.   
      
    - Philip   
      
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   Philip Paeps                                    Please don't email any replies   
   philip@paeps.cx                                     I follow the newsgroup.   
      
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