User Manual

VisionNet 202ER ADSL Ethernet Router User’s Guid
63
Adding NAT Rules
This section explains how to create rules for the various NAT flavors.
Note
You cannot edit existing NAT rules. To change a rule setup,
delete it and add a new rule with the modified settings.
The napt rule: Translating between private and public IP
addresses
Follow these instructions to create a rule for translating the private
IP addresses on your LAN to your public IP address. This type of
rule uses the NAT flavor napt, which was used in your default
configuration. The napt flavor translates private source IP
addresses to a single public IP address. The napt rule also
translates the source port numbers to port numbers that are defined
on the NAT Global Configuration page (see page 57). The
Introduction to NAT on page 55 describes how the napt rule works.
1. Click NAT in the Virtual Server tab, then select NAT Rule
Entry from the NAT Options drop-down list on the right side
of the page.
The NAT Rule entry page displays a row for each currently
configured NAT rule.
2. Click
to display the NAT Rule – Add page.
The NAPT flavor displays by default in the Rule Flavor drop-
down list. The NAT Rule – Add page displays, as shown in
Figure 26.
Figure 26. NAT Rule – Add Page (napt Flavor)
3. Enter a Rule ID.
The Rule ID determines the order in which rules are invoked
(the lowest numbered rule is invoked first, and so on). In some
cases, two or more rules may be defined to act on the same set
of IP addresses. Be sure to assign the Rule ID so that the