Garmin HM210DP/DI - Manual (Page 67)

Configuring NAT
EN/LZT 108 6492 R2 - October 2003 59
8.5 Adding NAT Rules
This section explains how to create rules for the various NAT flavors.
8.5.1 The NAPT Rule
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.
To create a NAPT rule, proceed as follows:
1. Select Services > NAT > NAT Rule Entry > Add. The NAT Rule –
Add page appears:
2. In the ”Rule Flavor:” dropdown list, select NAPT.
3. In the “Rule ID:” field, enter an ID for the rule.
The Rule ID determines the order in which the rules are invoked
(the lowest numbered rule is invoked first, and so on). In some
case, two or more rules may be fined 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.
4. From the “IF Name:” dropdown list, select the interface on the
HM210dp/di 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 IF
Name selection.