Roger,
> On Thu, 27 Apr 2006, Soohong Daniel Park wrote:
>   
>> While adopting ULA into the local networks, I am curious
>> how to set universal/local bit of Interface ID. There is
>> no any mention in RFC4193. Which is correct ? 1 or 0 ?
>>     
>
> 1 is for those assigned to you while 0 are free for any to use last I read 
> up on the subject.
>   

By my reading I think you have it backwards.  Here is the relevant text:

      L                 Set to 1 if the prefix is locally assigned.
                        Set to 0 may be defined in the future.  See
                        Section 3.2 for additional information.

Today, so far as I know, there is no defined allocation plan or system
for one to set that bit to 0.

Eliot


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