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Network Address Translation, or NAT, is a method of remapping an IP address from one IP space to another (for example the internet to your local 192.168.x address) by modifying the IP address information in the IP datagram while they're in transit.

3 votes

Why is NAT referred to as "the poor man's firewall"?

NAT is allow-all outwards, allow-only-established sessions inwards. For a user's PC, this can be roughly what you want, but for a server, it usually isn't. …
Ben Aveling's user avatar