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For questions about Network Address Translation (NAT), a method of modifying network address information in IPv4 packet headers.

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When the reply packet comes in, how does the NAT/PAT device know how to transform and forward the packet? The answer is that the NAT/PAT device maintains STATE. It has a "NAT Translation Table". … We translate inside local 192.168.1.95 to inside global 171.69.233.209 (from our NAT pool). Then we check if port 1220 is available for NAT pool ip 171.69.233.209. It is! …
answered Feb 22 '20 by Darrell Root