TP-LINK TL-ER5120 Specifications Page 17

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-11-
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.
z Non-NAT Mode
In this mode, the router functions as the traditional Gateway and forwards the packets via routing
protocol. The Hosts in different subnets can communicate with one another via the routing rules
whereas no NAT is employed. For example: If the DMZ port of the router is in WAN mode, the Hosts in
the subnet of DMZ port can access the servers in Internet only when the Static router rules permit.
Note:
In Non-NAT mode, all the NAT forwarding rules will be disabled.
z Classic Mode
It's the combined mode of NAT mode and Non-NAT mode. In Classic mode, the router will first
transport the packets which are compliant with NAT forwarding rules and then match the other packets
to the static routing rules. The matched packets will be transmitted based on the static routing rules
and the unmatched ones will be dropped. In this way, the router can implement NAT for the packets
without blocking the packets in the different subnet of the ports.
3.1.3 WAN
3.1.3.1 WAN Mode
TL-ER5120 provides four available WAN ports. You can set the number of WAN ports on this page.
Choose the menu NetworkWANWAN Mode to load the following page.
Figure 3-6 WAN Mode
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