Carrier-grade NAT

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Carrier Grade NAT (CGN) is an approach to Internet Protocol network design that hides end-user addressing behind a Network Address Translation (NAT) layer that is embedded in the network operator's network, as opposed to the customer's end-points or customer premises equipment.

CGN has been widely proposed as an approach for dealing with the problem of IPv4 address exhaustion.

Critics of the CGN approach argue that it breaks the end-to-end principle, has significant security problems, and has severe scalability and reliability problems by virtue of being stateful, and that it makes the keeping of records for law-enforcement operations more difficult.

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