Hey Markus,
All OCI Remote Acquisition Unit traffic is https to the OCI server - the RAU initiates a HTTPS connection to the OCI server's HTTPS port (default 443).
The DWH needs tcp 3306 access to all OCI servers for the ETL jobs to work, and should have tcp 80/443 as well.
The OCI DWH does not send OCI ASUP to NetApp - it will pick 1 OCI server it has an ETL "Connector" to, to pass OCI DWH Asup data to via 80/443.
The assumption is that the OCI server that receives the OCI DWH ASUP data will include that data as part of the OCI ASUP that particular OCI server sends
Matt