You can create a Virtual IP pool to define the range of public IP addresses that will be used for NAT. Go to the VIP section in the FortiGate configuration and create a pool with the 100 public IP addresses (e.g., 220.127.116.11 - 18.104.22.168). Once the VIP pool is created, you can configure Static NAT (one-to-one NAT) for each private IP address. For each private IP (e.g., 192.168.1.1 - 192.168.1.100), create a VIP mapping in the configuration, specifying the corresponding public IP from the VIP pool. Ensure that the NAT rules are correctly configured to use the Static NAT mapping. Update the source or destination address in the firewall policies to use the public IP addresses from the VIP pool, depending on whether you are configuring inbound or outbound NAT.
Test the NAT by accessing the public IP addresses from external networks and verify that the traffic is correctly translated to the corresponding private IP addresses.
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