[ppml] [address-policy-wg] Those pesky ULAs again

Hi,

On Mon, May 28, 2007 at 11:12:34PM -1000, Randy Bush wrote:
> Randy Bush wrote:
> >> ULA space should be !A'ed out by routers per default and have a 
> >> special switch to enable forwarding for them.
> > oh, site-local.  i remember that disaster.  no wonder the internet-draft
> > was stuffed.
> 
> RFC 1925 2(11) ?Every old idea will be proposed again with a different
> name and a different presentation, regardless of whether it works.?

Actually there is a difference - site-locals are not unique between 
different sites that might be linked privately, eventually.

I wasn't there when site-local was killed, but from what I understand,
the "uniqueness" and "where is a site border?" arguments where the ones
that people had most issues with.

ULAs do solve this - but indeed, having PI space easily available would
take away the need for "give me internal addresses that I do not want
to see globally routed".

OTOH, folks are afraid of PI, so ULAs are a possible answer to the
question "how can I get address space for internal use, which is never
meant to be visible on 'the global Internet'?".


I agree with you that any sort of "hard-code filter in router software" 
is something to recommend to your competition :-)  (after all, even if
ULAs are not supposed to be "globally" routable, they *are* supposed
to be used for private connetions between enterprises, and how is the
router supposed to tell the difference?).

Gert Doering
        -- APWG chair
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