Enable OpenVPN Server Behind 8800NL

[Martin Goose]

I have installed openvpn on a RaspberryPi using the instructions found here:
https://tryapi.wordpress.com/2014/10/13 ... -easyrsa3/

I have tested the installation from within the local network from an Android tablet using the official openvpn client app:
https://play.google.com/store/apps/deta ... pn.openvpn

and from the command line on a laptop running Linux. All checks out OK.

I now need to open up a 'route' through the router to test it from outside the local network. Reviewing the contents of the Billion manual I am confused about which of two options I need to use to pass UDP packets on port 34557.

The confusion is between the facilities for IP filtering (incoming) and NAT Virtual Servers. The latter seems more appropriate but I have tried both, separately, without success. I am not sure whether I need to use both options and whether a router restart is required.

I check to see whether the port is open externally using ShieldsUP! at grc.com
https://www.grc.com/default.htm

Advice from someone who has made this work would be appreciated.

[Martin Goose]

Following up my own post with the answers:

1. ShieldsUP! at grc.com was only checking for open TCP ports not UDP!

2. Using the NAT Virtual Servers page is all that is necessary.

3. The required port can be opened and closed without a reboot.

4. Checking the public IP port status with nmap was successful. For example:
nmap -v -sU -p34557 <my-public-IP>

5. The usual UDP port for OpenVPN is 1194, but there seems no requirement to use it (or 34557).