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4.5 Advanced
4.5.1 NAT
NAT (Network Address Translation) is the translation between private IP and public IP, which allows private network users to visit the public network using private IP addresses.
With the explosion of the Internet, the number of available IP addresses is not enough. NAT provides a way to allow multiple private hosts to access the public network with one public IP at the same time, which alleviates the shortage of IP addresses. Furthermore, NAT strengthens the LAN (Local Area Network) security of the network since the address of LAN host never appears on the Internet.
4.5.1.1NAT Setup
On this page, you can set up the NAT function.
Choose the menu Advanced→NAT→NAT Setup to load the following page.
Figure 4-24 NAT Setup
The following items are displayed on this screen:
NAPT
Source Port Range: Enter the source port range between 2049 and 65000, the span of which
must be not less than 100.
NAT-DMZ
application, which can be considered as a default forwarding rule. When NAT DMZ (Pseudo DMZ) is enabled, all the data initiated by external network falling short of the current connections or forwarding rules will be forwarded to the preset NAT DMZ host.
