PPTP passthrough of Peplink Balance is enabled by default. In order to allow the remote PPTP client connects the PPTPserver behind the Peplink Balance unit, you would need to create two Inbound Access rules at Network > Inbound Access > Services to accomplish the following:
- Forward traffic of IP protocol 47 of public IP to the PPTP server
- Forward traffic TCP 1723 of public IP to the PPTP server
- Remember to Save all settings and Apply Changes.