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3.1.2 System Mode
The TL-ER5120 router can work in three modes: NAT, Non-NAT and Classic.
If your router is hosting your local network’s connection to the Internet with a network topology as the
Figure 3-2 shows, you can set it to NAT mode.
Figure 3-2 Network Topology - NAT Mode
If your router is connecting the two networks of different areas in a large network environment with a
network topology as the Figure 3-3 shows, and forwards the packets between these two networks by
the Routing rules, you can set it to Non-NAT mode.
Figure 3-3 Network Topology – Non-NAT Mode
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