High Quality Content by WIKIPEDIA articles! Carrier Grade NAT (CGN) also known as Large Scale NAT (LSN) is an approach to Internet Protocol network design that hides end-user addressing behind a network address translation (NAT) layer that is implemented in middleboxes embedded in the network operator's network, as opposed to the customer's end-points or customer premises equipment. CGN/LSN has been widely proposed as an approach for dealing with the problem of IPv4 address exhaustion. Critics of the CGN/LSN 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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