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Configuring NAT for Overlapped Private and Public IP Addresses
Context
Twice NAT allows an internal host to access an extranet host whose IP address is the same as that of the intranet host. Twice NAT not associated with VPNs applies to the scenario where only one private IP address overlaps with a public IP address. Twice NAT associated with VPNs applies to the scenario where multiple private IP addresses overlap with public IP addresses.
Prerequisites
Configure dynamic NAT based on your site scenario to allow intranet hosts to access public networks. For details about how to configure dynamic NAT, see the configuration of dynamic NAT in address pool and Easy IP modes in Configuring Intranet Hosts to Access Public Networks.