On 2012-04-06 22:16, Manfredi, Albert E wrote:
> Just obsessing over this:
>
> In the ULA RFC and postings, people always use the fc00:: prefix as an
> example, it seems. But according to RFC 4193, the 8th bit in the first octet
> must be set to 1, to indicate "local," at least until someone figures out how
> to use a non-local ULA scheme.
>
> So in fact, the first octet will always be fd, yes?
>
> Just obsessing on a Good Friday.
The ULA prefix is fc00::/7 but indeed all prefixes created under
RFC 4193 are under fd00::/8.
The filtering rule in a border router needs to be on fc00::/7
to include a hypothetical future ULA scheme under fc00::/8.
Quoting prefixes without the prefix length isn't such a good idea.
Brian
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