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Group Structure: Click this button to view the tree structure of this group. All the members of
this group will be displayed, including Users and sub-Groups. The Group
Names are displayed in bold.
Available Member: Displays the Users and the Groups which can be added into this group.
Selected Member: Displays the members of this group, including Users and Groups.
3.3 Advanced
3.3.1 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.
3.3.1.1 NAT Setup
On this page, you can set up the NAT function.
Choose the menu Advanced→NAT→NAT Setup to load the following page.
Figure 3-29 NAT Setup
The following items are displayed on this screen:
¾ NAPT
Source Port Range:
Enter the source port range between 2049 and 65000, the span of which
must be not less than 100.
¾ NAT-DMZ
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