User's Manual

UTT Technologies Chapter 8 NAT
http://www.uttglobal.com Page 220
2. A system reserved NAT rule¶s external IP address is 0.0.0.0, which means that the
rule will use the related WAN interface¶s IP address as its external IP address; and it
is non-editable. A user-defined NAT rule¶s external IP address can be neither 0.0.0.0
nor the related WAN interface¶s IP address, that is, you can only use the other public
IP addresses provided by your ISP as its external IP addresses.
3. The internal IP address range of each NAT rule should not overlap, and the external
IP address range of each NAT rule should not overlap too; and the internal IP address
range of a Passthrough NAT rule should not overlap with the external IP address
range of any EasyIP or One2One NAT rule.
8.3.6 Configuration Examples for NAT Rule
8.3.6.1 An Example for Configuring EasyIP NAT Rule
1. Requirements
In this example, an Internet café has a single Internet connection, and obtains eight public
IP addresses (from 218.1.21.0/29 to 218.1.21.7/29) from the ISP. Therein, 218.1.21.1/29
is used as the Internet connection¶s gateway IP address, 218.1.21.2/29 is used as the
Device¶s WAN1 interfacH¶s IP address. Note that 218.1.21.0/29 and 218.1.21.7/29 cannot
be used as they are the subnet number and broadcast address respectively.
The administrator want the hosts in the online game area (its address range is from
192.168.16.10/24 to 192.168.16.100/24) to use 218.1.21.3/29 to access the Internet. To
achieve this purpose, he should create an EasyIP NAT rule for them. The rule¶s External
IP Address is 218.1.21.3, Start Internal IP address is 192.168.16.10, End Internal IP
Address is 192.168.16.100, and Bind to is WAN1. And we assume that the Weight is 2.
2. Configuration Procedure
The configuration steps are the following:
Step 1 Go to the NAT > NAT Rule page, and select the NAT Rule Settings tab to go to
the setup page.
Step 2 Select EasyIP from the NAT Type drop-down list, see the following figure.