Using VPN with a draytek behind a zyxel firewall

Posted on 2015-01-18
Last Modified: 2015-01-29

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:

    incoming: any
    Source: NAT Internal IP
    Destination: NAT internal IP
    Service: GRE and pptp (1723)

    Interface: WAN2
    Original IP: NAT Internal IP
    Mapped IP: Draytek IP
    Port: PPTP (1723)
    Protokoll: TCP

Similar settings work fine with RDP or https. But i can´t access VPN. I deactivated everything of VPN i found in zywall.
Question by:loosain
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 96

Accepted Solution

Experienced Member earned 500 total points
ID: 40556785
Did you try NAT Traversal on the Draytek?  You have created a double NAT type of situation.

Can you use the Draytek as firewall also and eliminate the other firewall (in other words, why so complicated?)

Author Closing Comment

ID: 40577159
Our customer wants it so. I have a new question started with a little more detailed information:

Featured Post

Supports up to 4K resolution!

The VS192 2-Port 4K DisplayPort Splitter is perfect for anyone who needs to send one source of DisplayPort high definition video to two or four DisplayPort displays. The VS192 can split and also expand DisplayPort audio/video signal on two or four DisplayPort monitors.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In the hope of saving someone else's sanity... About a year ago we bought a Cisco 1921 router with two ADSL/VDSL EHWIC cards to load balance local network traffic over the two broadband lines we have, but we couldn't get the routing to work consi…
This article offers some helpful and general tips for safe browsing and online shopping. It offers simple and manageable procedures that help to ensure the safety of one's personal information and the security of any devices.
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
Suggested Courses

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question