The firmware 6.2.1 user manual says that port 32015 is used with speed fusion. Quoting
“Peplink proprietary SpeedFusion uses TCP port 32015 and UDP port 4500 for establishing VPN connections.”
I am using PepVPN but my Balance 20 doesn’t support Speed Fusion, at least I don’t see it in the web UI where the manual says it should be.
The manual also describes the Data Port field for PepVPN as a UDP port number used for outgoing VPN data. But here too, it does not seem to apply. I detected the port being open using TCP from the outside, which means incoming data.
Quoting the user manual on Data Port: “This field is used to specify a UDP port number for transporting outgoing VPN data. If Default is selected, UDP port 4500 will be used. Port 32015 will be used if the remote unit uses Firmware prior to version 5.4 or if port 4500 is unavailable.”
The PepVPN connection in the Balance 20 is to a Surf SOHO running firmware 6.2.0, so we are not dealing with firmware prior to version 5.4.
And the web UI helps says: “This field specifies the outgoing UDP port number for transporting VPN data. If Default is selected, port 4500 will be used by default. Port 32015 will be used if the remote unit’s firmware version is prior to 5.4 or the port 4500 is unavailable for use.”
If the documentation is correct, the Balance 20 should not have port 32015 open to accept incoming TCP connections.