[111266] in North American Network Operators' Group
Re: Private use of non-RFC1918 IP space
daemon@ATHENA.MIT.EDU (Stephen Sprunk)
Mon Feb 2 15:52:55 2009
Date: Mon, 02 Feb 2009 14:52:43 -0600
From: Stephen Sprunk <stephen@sprunk.org>
To: TSG <tglassey@earthlink.net>
In-Reply-To: <49871D99.3000404@earthlink.net>
Cc: north American Noise and Off-topic Gripes <nanog@merit.edu>,
Joe Greco <jgreco@ns.sol.net>
Errors-To: nanog-bounces@nanog.org
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TSG wrote:
> I find it really troublesome to believe that the subnetting on a site
> was so complex that it ate an entire /8. What I am betting is that for
> some reason that ISP wants its addressing to be totally flat and not
> replicated.
The subnetting doesn't need to be "complex"; they may simply have a
large number of small sites, or a moderate number of relatively large
sites, that will eat up more than a /8's worth of addresses. There _do_
exist companies with 100,000+ locations and a few dozen devices per
location; throw in the necessary aggregation so the routers don't fall
over and you're looking at NATing multiple instances of 10/8 -- and I
know from experience that's not fun.
However, the OP implies that his problem is caused by a poor subnetting
scheme in 10/8; the correct solution in that case is to fix the
subnetting -- but mgmt may not be willing to pay the labor (or other)
costs of that.
S
--
Stephen Sprunk "God does not play dice." --Albert Einstein
CCIE #3723 "God is an inveterate gambler, and He throws the
K5SSS dice at every possible opportunity." --Stephen Hawking
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