L2TP VPN behind a router

Gayanll

Hi guys, im totally new to VPN thing.

I want to connect to my home network from my laptop (win7) when im abroad. my home network can be illustrated like below picture.

I simply want to access my home NAS (12.168.1.99) from my lap when im outside (i have ddns account ). Can somebody please explain the procedure (or a tutorial if possible).

So far I have port forward all required ports for L2TP (UDP/TCP) from F660 to Zyxel. What ever Youtube tutorials i follow i still get error in windows VPN connection saying "security layer encountered a processing error during initial negotiation with remote computer"

Please help, Thanks

#Biz_Security_Nov_2018

Gayanll

nobody?

Zyxel_Emily

Hi @Gayanll ,

The USG20-VPN is placed behind NAT. 

You can follow the guide in the FAQ article to add a NAT rule for L2TP service(IKE, NATT, L2TP-UDP) on the router and allow L2TP service.

You may also need to create a registry key on Windows client.

https://businessforum.zyxel.com/discussion/675/how-do-i-configure-the-zywall-for-a-l2tp-server-behind-nat

To access the NAS, you need configure NAT and firewall on not only USG20-VPN but also the ZTE F660 router.

Here is a similar article for your reference.

https://businessforum.zyxel.com/discussion/1825/usg60-nas-conecntion-from-home-to-office

Gayanll

i will follow and reply. thanks