On the Pioneer, there is only an ethernet cable connection. I believe that by default it is set to “internal” while tun0 is set to “external”.
As a consequence, when connecting to the OpenVPN server:
- all services that are accessible only on the local network, e.g. smb shares, are accessible
- all services that are accessible externally, e.g. email, xmpp, are not accessible
One possibility is to change the ethernet cable connection to “external”, then all services accessible externally will be accessible, but services only accessible on the local network will not. This is briefly mentioned in the documentation and also discussed here.
This was mentioned here, with the same question on security implications, I don’t know whether there is some anwer. By the way, I have no clue what “masquerade” means, any explanation is welcome.