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Secure NAT is implemented in routers and modems that provide Internet connectivity to multiple users in a LAN or small network.
In a SNAT-based network environment, all devices connect to the local SNAT device/router/modem, but each computer has a distinct and unique IP address. The SNAT-configured router sends its request by replacing the source IP address with its IP address. When the destination device receives the packet from the local device, it sees the SNAT-configured source IP address - not the device's actual IP address. This secures the internal network from exposure to external networks while allowing the same IP address to be used by multiple devices.
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