Re: There are claims of ambiguity over what is a link-local address

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On May 7, 2012, at 9:57 AM, "Christian Huitema" <huitema@microsoft.com> wrote:

>>> Link-Local Unicast Addresses          1111 1110 10   1/1024
>>> Site-Local Unicast Addresses          1111 1110 11   1/1024
>> ...
>> So they define the /10 as the link local *prefix*, within which any *addresses* have to fall into the /64.
>> The rest of the /10 is unused but is still defined as link-local scope.
> 
> The specs may be reasonable, but they did cause confusion for addresses in FE80::/10 but out of FE80::/64. Some implementations appear to treat these addresses as global, others as local, and yet others as "unexpected." There may be a way to use these addresses as an attack vectors against poor implementations. Given that, I would suggest to be very specific:
> 
> * FE80::/64 is used for configuring link local addresses;
> * FE80::/10 is reserved by the IETF. 
> * By default, implementations SHOULD discard packets received from addresses in FE80::/10 outside of FE80::/64
These statements are much clearer.
> 
> -- Christian Huitema
> 
> 
> 
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