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In a perfect world with proper network design I would have to disagree with you. I believe that properly subnetted the private address space allocated would be enough. Classful routing and VLSM should take care of this problem.
But in the real world, with not so great network design I have seen many cases where more space is needed.
You've got 3 blocks already. From RFC 1918:
3. Private Address Space
The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)Are your customers using *all* those blocks?
Harald
-- Harald Tveit Alvestrand, EDB Maxware, Norway Harald.Alvestrand at edb.maxware.no
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