Persistence settings for LSN translation entries. none: Specifies that there is no persistence for the translation. address: Specifies that the translation reuses the port mapping for subsequent packets sent from the same internal IP address and port to the same external IP address while the mapping is still active, regardless of the external port. addressPort: Specifies that the translation reuses the port mapping for subsequent packets sent from the same internal IP address and port to the same external IP address and port while the mapping is still active.