Support for both public and private IP at the same time is available on both V1 and V2 SKU. Customers can host multiple sites behind the same IP and port using multi-site listener today.
Support for allowing same port on both public and private IP is in the roadmap.
An error occurred while saving the commentGes commented
Though new connections are blocked, established connections are unaffected by addition of Deny rule (for example, a SSH connection). An improvement would be to have a flush facility which would implement the NSG rule set immediately and including active connections.