If the requirement is to allow traffic only to the ONTAP from an external Host, the port should be forwarded(opened) with Inbound Setting. If the traffic only needs to move from the ONTAP to an extern...If the requirement is to allow traffic only to the ONTAP from an external Host, the port should be forwarded(opened) with Inbound Setting. If the traffic only needs to move from the ONTAP to an external host it should be Outbound. If the requirement is to exchange traffic to and from the ONTAP it should be bidirectional. What ports need to be open to allow access to ONTAP and which port numbers are used for communications?