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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