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What are NAT and PAT

Network Address Translation (NAT) is designed for IP address simplification and conservation, as it enables a private IP to use a public IP addresses to connect to the Internet.

Port Address Translation (PAT) or Overloading can be used to translate mutilple private IP  addresses to one or more public IP addresses. Unique source port numbers on each translation are used to distinguish between the conversations.

With NAT Overload, a translation table entry containing full address and source port information is created.

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