subnet prefix length > 64 breaks IPv6?

Joel Maslak jmaslak at
Tue Dec 27 23:38:50 UTC 2011

On Dec 27, 2011, at 4:28 PM, Glen Kent <glen.kent at> wrote:

> I had assumed that nodes derive their link local address from the
> Route Advertisements. They derive their least significant 64 bytes
> from their MACs and the most significant 64 from the prefix announced
> in the RAs.

No, link local addresses are not derived from RAs.  Even a system not connected to a router will have a link local address on each ethernet (I couldn't tell you how link local works on PPP, ATM, etc, without looking it up - but it doesn't require /64 networks).

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