Destination NAT vs Source NAT with Bi-directional option

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Destination NAT vs Source NAT with Bi-directional option

L1 Bithead

Hi All,


In enterprise network, what are the usage scenarios for Destination NAT and Source NAT with Bi-directional option enable ?





L6 Presenter



Very good explanation here:


Doesn't matter enterprise or home network NAT still the same:


Source NAT translates your source IP to a different one

Destination NAT translate your destination IP (one use of for enabling access to your internal servers from Internet)

Bi-directional really same as above, means by ticking the box you will create implicit Destination NAT policy. GUI will only show you that it is bidirectional but CLI will display the same rule as two separate (Source and Destination):


> show running nat-policy




Cyber Elite
Cyber Elite

Here's a video where I explain several scenarios : Tutorial: Network Address Translation


There is only one configuration method allowed where the bi-directional option is supported, and that is for source nat (bi-directional cannot be enabled when destination NAT is configured because the bi-directional option needs to be able to set the destination option in the implied reverse policy


if for example the configured rule is like this:

bidirectional nat.png

the bi-directional option will create an implied rule that sets destination translation for IP if the original packet is headed toward coming from the remote zone


hope this helps



Tom Piens
PANgurus - SASE and Strata specialist; (co)managed services, VAR and consultancy

Hi All,


Thanks a lot for all the explanations.


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