User manual

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This section explains how to create rules for the various NAT
flavors.
The napt rule: Translating between private and public IP
addresses
The NAT flavor napt was used in your default configuration. The
napt flavor translates all LAN-side private source IP addresses to
a single public IP address. It also translates the source port
numbers to port numbers that are defined on the NAT Global
Configuration page.
1. Select
Services
>
NAT
>
NAT Rule Entry
>
Add
.
2. Click the Rule ID drop-down list to assign a number to the
rule.
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. Once a data packet matches a rule, the
data is acted upon according to that rule and is not subjected
to higher-numbered rules.
3. In the Rule Flavor drop-down list, select
NAPT
, if
necessary.
4. From the IFName drop-down list, select the interface on
the RTA100+ ADSL Modem/Router to which this rule
applies.
Typically, NAT rules apply to communication between your
LAN and the Internet. Because the device uses the WAN
interface (named ppp-0 or eoa-0) to connect your LAN to your
ISP, it is the usual IFName selection.
5. Select a protocol to which this rule applies, or choose ALL
if the rule applies to all data.
6. In the
Local Address From/To
fields, type the starting and
ending IP addresses, respectively, of the range of private
address you want to be translated. Or, type the same
address in both fields to specify a single value.