Re: [PATCH] IPv6: Fix Prefix Length of Link-local Addresses

   From: Yuji Sekiya [off-list ref]
   Date: Thu, 10 Oct 2002 08:41:52 +0900
   
   The reason we change the prefix length  from /10 to /64 is
   following spec and adapting other imprementations.

I think Derek's explanation shows that the specification
allows the /10 behavior.

Also, I suspect that since Derek works for Cisco, some "other
implementations" behave how he describes. :-)