Re: RFC4193 - ULA universal/local bit = 1 or 0

[Brian Haberman]

On Apr 27, 2006, at 6:48, Eliot Lear wrote:

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 ?

up on the subject.

1 is for those assigned to you while 0 are free for any to use last I read

      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.

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

the IID should not be impacted by the use of ULAs.  Rather, its settings
are based on the rules in Section 2.5.1 of RFC 3513.

Regards,
Brian

I don't believe the original poster was asking about the L bit in the ULA prefix, rather about the U/L but in the Interface Identifier. The U/L bit in

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