How to config VPN or DDNS service with private WAN IP address 192.168.x.x

[qneeuqeo]

My modem RT-AC68U is connect with Cable Modem.

The wireless router currently uses a private WAN IP address (192.168.x.x).

I tried to set up OpenVPN, seen with error:

The wireless router currently uses a private WAN IP address (192.168.x.x, 10.x.x.x, or 172.16.x.x). Please configure DDNS service before starting the VPN server.


Then I tried to enable the DDNS service, with another error:

The wireless router currently uses a private WAN IP address (192.168.x.x, 10,x,x,x, or 172.16.x.x).

This router may be in the multiple-NAT environment and DDNS service cannot work in this environment.

Can anybody please tell me If the VPN or DDNS service will working with the private WAN IP?

 

[Ford Prefect]

OpenVPN defenitely does work when on a private network.
Edit: at least in my version of the FW...and in order to use it, the Cablemodem/Router needs to treat the ASUS as an exposed host (portwarding of all traffic).
Edit2: assuming you were referring to OpenVPN *Server* in your post.

However, the standard ASUS DDNS client will refuse to connect/work when on a private network. (fortunately, my ISP provides this service to customers automagically).