SMC Networks ADSL Barricade SMC7204BRA - Manual (Page 69)

Adding NAT Rules
67
Figure 22. NAT Rule-Add Page (NAPT Flavor)
4. 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). If you define two or more rules that act on the same
set of IP addresses, be sure to assign the Rule ID so that the
higher priority rules are invoked first. It is recommended that
you specify Rule IDs as multiples of 5 or 10 so that, in the
future, you can insert a rule between two existing rules.
Once a data packet matches a rule, the data is acted upon
according to that rule and is not subjected to higher-numbered
rules.
5. From the [IF Name:] drop-down list, select the interface on the
device to which this rule applies. Typically, NAT rules are used
for communication between your LAN and the Internet. Because
the device uses the WAN interface (which may be named
[ppp-0], [eoa-0], or [ipoa-0]) to connect your LAN to your ISP,
it is the usual IF Name selection.
6. In the [Local Address From:] field and [Local Address To:]
fields, type the starting and ending IP addresses, respectively,