TP-Link TL-ER6020 manual  NAT Mode

Figure 3-4 Network Topology – Classic Mode

Choose the menu Network→System Mode to load the following page.

Figure 3-5 System Mode

You can select a System Mode for your Router according to your network need.

NAT Mode

NAT (Network Address Translation) mode allows the Router to translate private IP addresses within internal networks to public IP addresses for traffic transport over external networks, such as the Internet. Incoming traffic is translated back for delivery within the internal network. However, the Router will drop all the packets whose source IP addresses are in different subnet of LAN port. For example: If the LAN port of the Router is set to 192.168.0.1 for IP address and 255.255.255.0 for the Subnet Mask, then the subnet of LAN port is 192.168.0.0/24. The packet with 192.168.0.123 as its source IP address can be transported by NAT, whereas the packet with 20.31.76.80 as its source IP address will be dropped.

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