How to forward to OpenVPN

millercb

I am using a Raspberry Pi as an OpenVPN client, instead of a server as most people are. I am using the Raspberry Pi essentially as a wireless access point. I connect to the wireless network broadcast by the Pi with my computer or phone. I will have the Pi set up as an OpenVPN client, connected to a Windows computer on another network (which will be an OpenVPN server). I need the Pi to take all traffic that it receives on the wireless adapter, and forward it over another adapter that is set up with OpenVPN. Is this something that can be done? Is this a setting of OpenVPN, or more of a question of linux commands to set this up. Sorry, I am new to OpenVPN. I haven't set the system up yet because I need to make sure that this can be done before I get everything set up.

A little diagram to hopefully make things a little more clear:

Phone -------(wireless)-------[ Raspberry Pi wlan ---> Raspberry Pi Lan (set up with OpenVPN) -----(OpenVPN tunnel)------Windows OpenVPN server

Thank you for your time.

Traffic

millercb wrotePhone -------(wireless)-------[ Raspberry Pi wlan ---> Raspberry Pi Lan (set up with OpenVPN) -----(OpenVPN tunnel)------Windows OpenVPN server

This can work ..

This may be easier:

  OpenVPN                                                       OpenVPN
  Client~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Server
[ Phone ]---(wireless)----[ Pi wlan = Pi Lan ]---(internet)---[ Windows ]

millercb

Traffic wrote This may be easier:

  OpenVPN                                                       OpenVPN
  Client~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Server
[ Phone ]---(wireless)----[ Pi wlan = Pi Lan ]---(internet)---[ Windows ]

If I follow you correctly, are you saying to run the OpenVPN client on the phone, then just have it pass through the Raspberry Pi? Unfortunately this is not an option for my setup. I do not want the phone to be running the OpenVPN client. I guess the easiest way to describe it would be that I am running the Raspberry Pi as a WiFi hotspot. I want any device that connects to it to have the benefit of OpenVPN. Essientially, any device connects to the Raspberry Pi WiFi, it forwards that data over the Lan port, which has an OpenVPN tunnel with the Windows device on another network. Please let me know if I need to describe it any better/differently. Also, if this is possible, would you be able to tell me what I need to do to get this working, or at least point me in the right direction?

Thanks.

Traffic

Setup your VPN using the HOWTO:
HOWTO: For OpenVPN Community Edition
(Recommend reading all of it)

Once you have a working VPN Implement this HOWTO(2):
HOWTO: Routing all client traffic (including web-traffic) through the VPN

You can try NATHack on the server. (Or you can learn routing)

Also, ensure IP forwarding is enabled on your server .. And your client.

Once you have done all that you can use iptables NAT on your client (not server) similar to the way it is shown in that HOWTO(2)
(When you get to this stage we can work out the iptables rule you will need)

It is complicated, so don't expect it to work straight away .. and I may have forgotten / overlooked something.