2 WAY NAT VS BI-DIRECTIONAL NAT

[avilT]

Is Bi-Directional NAT is same as Two way NAT? If not, kindly explain me the bi-directional NAT.
Thank You

[david]

bi-directional nat allows a packet to match more than 1 nat rule.
whereas normally once a packet matches a nat rule, the fw does not process any more nat rules.

this only applies for automatic nat rules. once a packet matches a manual nat rule, no further matching takes place.

[avilT]

could you please provide me an example. when can it be really usable?