Internet Protocol version 4 uses a 32 bit IP address. In theory ,a 32 bit address space should provide addresses for more than four billion computers, but inefficiencies in address allocation mean that less than half of the addresses are used. The result is so called-'Internet address crisis"-there! are more computers than usable addresses Therefore permanent IP addresses have become expensive. There are two solutions to the problem .One is a long term solution of using IPv6,and the other is a short -time practical solution called NAT which is highly used. This seminar tries to bring out the [details of NAT and finally how it helps to implement the IPv4 to IPv6 transitions .

Network Address Translation is a method by which IP addresses are mapped from one realm to another, in an attempt to provide transparent routing to hosts. Traditionally, NAT devices) are used to connect an isolated address realm with private unregistered addresses to an external realm with globally unique registered addresses.

Address translation allows hosts in a private network to transparently communicate with destinations on an external network and vice versa . There are a variety of flavors of NAT and terms to match them. This document attempts to define the terminology used and to identify various flavors of NAT. The document also attempts to describe other considerations applicable to NAT devices in general.

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