TRENDnet TDM-E400 - Manual (Page 131)

Chapter 12. Configuring Network Address Translation
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5. In the Global Address From and Global Address To fields,
type the starting and ending addresses that identify the pool
of public IP addresses that the private addresses should be
translated to. Or, type the same address in both fields (if you
also specified a single address in step 4).
6. Follow steps 8-11 under "The NAPT rule" on page 125 to
submit your changes.
The Filter rule: Configuring a Basic rule with additional criteria
Like the Basic flavor, the Filter flavor translates public and private IP
addresses on a one-to-one basis. The Filter flavor extends the
capability of the Basic rule. Refer to “The Basic Rule” on page 130
for a general description.
You can use the Filter rule if you want an address translation to
occur only when your LAN computers initiate access to specific
destinations. The destinations can be identified by their IP
addresses, port type (which identifies it as a FTP or Web server, for
example), or both.
Figure 54 shows the fields used to establish a Filter rule.
Figure 54. NAT Rule
⎯Add Page (Filter Flavor)
Follow these instructions to add a Filter rule (see steps 1-4 under
"The NAPT rule" on page 125 for specific instructions
corresponding to steps 1 and 2 below):
1. Display the NAT Rule – Add Page, select FILTER as the
Rule Flavor, and enter a Rule ID.
2. Select the interface on which this rule will be effective.