NAT444 introduction

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Net Address Translation (NAT) is an important technique used in IPv4-to-IPv6 transition. NAT44 translates an IPv4 address to another IPv4 address. NAT444 indicates two-level NAT44 that the customer-premises equipment (CPE) performs NAT, and a carrier-grade NAT (CGN) device performs NAT44. NAT444 is also called large scale NAT (LSN) that applies when NAT techniques are used in a large scale on carrier networks.

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