SMC Networks ADSL Barricade SMC7204BRA - Manual (Page 74)

Configuring Network Address Translation
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you specify. For example, if your Web server uses (non-
standard) port 2000, but you expect incoming data packets
to refer to (standard) port 80, you should enter 2000 here
(and select HTTP or type 80 in the Destination Port fields).
The headers of incoming packets destined for port 80 will
be modified to refer to port 2000. The packet will then be
routed appropriately to the web server.
8. Follow steps 8-12 under The NAPT Rule on page 68
to submit your changes.
The Basic rule: Performing 1:1 translations
The Basic flavor translates the private (LAN-side) IP address
to a public (WAN-side) address, like NAPT rules. However, unlike
NAPT rules, Basic rules do not translate the port numbers in the
packet header; they are passed through untranslated. Therefore,
the Basic rule does not provide the same level of security as the
NAPT rule.
Figure 24. NAT Rule - Add Page (BASIC Flavor)