SMC Networks ADSL Barricade SMC7204BRA - Manual (Page 76)

Configuring Network Address Translation
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6. Follow steps 8-12 under The NAPT Rule on page 68
to submit your changes.
The Filter rule: Configuring a BASIC rule
with additional criteria
Like the BASIC flavor, the Filter flavor translates public and
private IP addresses on a one-to-one basis. The Filter flavor
extends the capability of the BASIC rule. Refer to The BASIC
Rule on page 72 for a general description.
You can use the Filter rule if you want an address translation
to occur only when your LAN computers initiate access to specific
destinations. The destinations can be identified by their IP
addresses, the port type (which identifies it as a FTP or
Web server, for example), or both.
Figure 25. NAT Rule - Add Page (FILTER Flavor)