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Intranet Hosts Accessing Public Networks
Private IP addresses are planned for hosts on private networks for communities, schools, and enterprises because public IP addresses are limited. In this case, dynamic NAT can be used to enable access from intranet hosts to public networks. You can use dynamic NAT in address pool mode or Easy IP mode based on the number of available public IP addresses.
Dynamic NAT in Address Pool Mode
When you have a large number of public IP addresses, after the IP address of the outbound interface of the NAT device and other applications are configured, there are still idle public IP addresses. In this case, dynamic NAT in address pool mode can be used. Dynamic NAT in address pool mode uses an IP address in the address pool as the translated public IP address of an intranet host. As shown in Figure 5-20, you can configure dynamic NAT in address pool mode on the Router to allow intranet hosts to access the server on the public network.
Dynamic NAT in Easy IP Mode
When a user has only a few public IP addresses, after the outbound interface IP address of the NAT device and other applications are configured, there is no idle public IP address. In this case, dynamic NAT in Easy IP mode can be used. Dynamic NAT in Easy IP mode uses the outbound interface IP address as the translated public IP address of an intranet host. As shown in Figure 5-21, you can configure dynamic NAT in Easy IP mode on the Router to allow intranet hosts to access the server on the public network.
