Re: IPv6 filtering

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On Wednesday 2011-02-02 14:30, Guido Winkelmann wrote:
>>>
>>>There shouldn't be, just as long as you only filter on the source
>>>address of outgoing packets, and not on the destination of incoming
>>>ones. The NDP request packets go to weird multicast addresses
>> 
>>That "weird multicast address" is just broadcast so to speak, there is
>>nothing weird about it.
>
>Well, from what I could gather in wireshark, it's a bunch of different dst 
>addresses that are used for that, and which one is used appears to depend on the 
>address being queried...

Solicited-node MC. Nothing special really, works like a limited broadcast.

>Of course, if you don't have any IPv6 routers on the local net, or if they don't 
>send router advertisements, then the second autoconfigured address will not 
>exist, but then, if there is no IPv6 router, then saying the host is "using 
>IPv6" is a bit far fetched

Autoconfiguration is not a mandatory requirement for using IPv6.
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