I need to create Hybrid Microsoft Cloud solution for my customer , where I need to migrate some of the legacy applications at cloud in IaaS model , some of the latest and new website would be at PaaS model I need to use Azure Active directory for authentication /authorization and these cloud resources need to talk with On-premise systems like some database /domain controller or OLTP data need to to upload with SQL Data warehouse very frequently at scheduled time
Now my question is if I choose VPN sites to site option to connect on-premise network with azure then would it be fine for my PaaS resources which can communicate with On-premise system or still i need to install on-premise gateway ,Relay services ect.
My apologies for a very late reply to this but this is pretty straight forward. You will enable the service endpoints for your platform as a service offerings. Please see the article below and let me know if you are still exploring this and I would be happy to help.