SMC Networks ADSL Barricade SMC7204BRA - Manual (Page 81)

Adding NAT Rules
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3. In the [Local Address From:] and [Local Address To:] fields,
type the lowest and highest IP addresses that define the
range of private address you want to be passed without
translation. If you want the Pass rule to act on only one
address, type that address in both fields.
4. Follow steps 7-12 under The NAPT Rule on page 68 to
submit your changes.