i am trying to install a draytek device only for VPN behind a zyxell zywall usg200.
If i connect to the draytek from intenal lan i can access vpn and authenticate.
But if i connect from outside, i cant connect. So i think the Zyxell blocks it?
I inserted the following:
Source: NAT Internal IP
Destination: NAT internal IP
Service: GRE and pptp (1723)
Original IP: NAT Internal IP
Mapped IP: Draytek IP
Port: PPTP (1723)
Similar settings work fine with RDP or https. But i can´t access VPN. I deactivated everything of VPN i found in zywall.