Date: Thu, 01 Dec 2011 23:08:51 -0800
From: Doug Barton <dougb@xxxxxxxxxxxxx>
Message-ID: <4ED87983.4090203@xxxxxxxxxxxxx>
| Step 3: If your customer has somehow chosen the same prefix, tell them
| they can't do that.
Another alternative there is for the ISP to simply pick a different
prefix. There's nothing that says that the ISP has to number all of
its customers into a single number space - sure that might be more
convenient for them, but convenience isn't the objective. What is needed
is that this not happen too often, or it would be unmanageable.
The only time this won't work at all, is if the customer has used all of the
1918 space (really used, not just pretended) - in that case there won't be an
available address from 1918 space to select that can be used - but for the
very small number of such huge customers, I see no problem continuing to use
genuine public addresses (the same one they have been using in the pre CGN
days that they won't need to be using as many of in a post CGN world).
That is, there's no need for one standard solution for this for everyone.
1918 space can be made to work, almost always, it already exists, and adding
one more "unroutable" prefix isn't really going to achieve anything other
than giving the carriers a way to say "what we're doing has been blessed
by the IETF, see they even assigned an address for us to use, it must be OK".
kre
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