NSX-T DFW iin/out direction understanding

[jeffj2000]

Hi. I am having problems understanding what exactly the in/out direction is used for or actually how it matters since you already have a source/destination in the rule? I have googled some explainations but nothing is sticking with me. Anyone care to try to make me finally understand? Thanks,,,

[CyberNils]

The options are In, Out, and In/Out. The default is In/Out. This field refers to the direction of traffic from the point of view of the destination object. In means that only traffic to the object is checked, Out means that only traffic from the object is checked, and In/Out means traffic in both directions is checked. To access this property, click the Advanced Settings icon.

Here is a blog discussing it more in detail:

https://virtuallyjason.blogspot.com/2018/05/direction-and-applied-to-for-nsx.html