NetComm NTC-400 Series User Manual page 123

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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