Comparison of Static NAT and Dynamic NAT
| Aspects | Static NAT | Dynamic NAT |
| Superiority | – Public IP addresses are fixed. | – More efficient in the use of public IP addresses. |
| – Suitable for servers that require permanent access. | – Saves IP resources due to alternate use. | |
| – Easy to register to DNS. | – It is suitable for networks with many clients. | |
| Limitations | – Requires one public IP address for each private device. | – The device does not have a fixed public IP. |
| – Inefficient for large networks with multiple devices. | – Cannot be used for devices that need to be accessed from the internet. |
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When to Use Static NAT and Dynamic NAT
1. Static NAT
It is implemented when a device in a private network requires a consistent public IP address.
Ideal for web servers, email servers, or other devices that require continuous access from the internet.
For example, a company has a server with a private IP address 192.168.1110 that it wants to access from the internet using a public IP address 203.0.113.10. Static NAT ensures that this connection is maintained.
2. Dynamic NAT
Used when many devices in a private network require access to the internet but do not require a fixed public IP address.
Suitable for clients who only communicate to the internet, such as the user’s computer in the office or IoT devices.
For example, a small office with a private network 192.168.11.0/24 takes advantage of the public IP range 203..0.113.10 – 203.0.113.20 to provide temporary access to their devices.