The "inbound-interface" filter
The inbound-interface filter applies only to DNAT rules. It specifies the inbound traffic flow to which NAT applies.
Filtering inbound interface
The following example shows how to apply a DNAT rule, rule 20, to inbound traffic on the dp0p1p1 interface.
vyatta@vyatta# set service nat destination rule 20 inbound-interface dp0p1p1