SMC Networks ADSL Barricade SMC7204BRA - Manual (Page 79)

Adding NAT Rules
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Bimap rules can be used to provide external access to a LAN
device. They do not provide the same level of security as RDR
rules, because RDR rules also reroute incoming packets based
on the port ID. Bimap rules do not account for the port number,
and therefore allow external access regardless of the destination
port type specified in the incoming packet.
Figure 26. NAT Rule - Add Page (BIMAP Flavor)
Follow these instructions to add a Bimap rule (see steps 1-4
under The NAPT Rule on page 66 for specific instructions
corresponding to steps 1 and 2 below):
1. Display the [NAT Rule – Add] Page, select [BIMAP] as
the [Rule Flavor:], and enter a [Rule ID:].
2. Select the interface on which this rule will be effective.
3. In the [Local Address:] field, type the private IP address of
the computer to which you are granting external access.
4. In the [Global Address:] field, type the address that you want
to serve as the publicly known address for the LAN computer.
5. Follow steps 8-12 under The NAPT Rule on page 68 to
submit your changes.