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GRC | Multi-NAT Router Network Configuration Details
NAT router default settings are designed to allow a router (one router) to be dropped into an existing network — inserted between a cable or DSL modem and the computer it was previously connected to — without requiring any configuration changes of any equipment — modem, router, or computer. But when multiple NAT routers will be used to create more complex network topologies, some customization is usually needed.
A bit more understanding of NAT router operation will clarify what’s going on and guide you toward making the required router configuration changes needed to create more complex networks.
via GRC | Multi-NAT Router Network Configuration Details .