requests by port forwarding the requests to the LAN servers and transfers the replies from LAN servers to the requester on
the WAN side.
Figure 146 – Virtual Server & NAT Loopback
As shown in the above example, an e-mail virtual server is defined to be located on a server with IP address 10.0.75.101 in
the Intranet of Network-A, including the SMTP service port 25 and POP3 service port 110. The remote user can access the e-
mail server with the router’s global IP 118.18.81.33 from its WAN side, but the real e-mail server is located on the LAN side
and the router is the port forwarder for the e-mail service.
NAT Loopback allows you to access the WAN global IP address from inside your local network. It is useful when you run a
server inside your network. For example, if you configure an e-mail server on the LAN side, your local devices can access this
e-mail server through the router’s global IP address when the NAT loopback feature is enabled. From that point, you do not
need to change the IP address of the e-mail server to access it from either side of the LAN or WAN.
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