What rules to specify for Photon Server ports?

We are trying to start Photon Server on a VM and we asked the service provider to open the ports as specified here .

The service provider is asking us to specify what rule to apply to each port. They have 4 options for each port:
1) Public IP rule for allowing connections from server public ip to external systems
2) Public IP rule for allowing connections from external systems to server public ip
3) Private IP rule for allowing connections from server private ip to external systems
4) Private IP rule for allowing connections from external systems to server private ip

It seems to me that we need to apply Rule (2), Public IP rule for allowing connections from external systems to server public IP, for all the ports but I would appreciate if someone can confirm this.

Thanks.

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