Windows XP as OpenVPN server with redirect-gateway

Samples of working configurations.
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Bebop
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Joined: Wed Dec 15, 2010 9:24 pm

Windows XP as OpenVPN server with redirect-gateway

Postby Bebop » Tue Mar 22, 2011 6:14 am

Diagram:
Image

Goal:
  • Your Windows XP PC becomes an Internet gateway, using OpenVPN server mode. Traffic can be tunneled from any OpenVPN client.

Scope:
  • This example assumes that you already know how to install OpenVPN and setup keys and/or certificates. For the scope of this example, information about key and certificate management will not be provided.

Overview:
  • We'll setup a server.ovpn, a client.ovpn, and some Windows XP settings. Keep in mind that .ovpn is the Windows equivalent of .conf in Linux.

The Code

server.ovpn

Code: Select all

port 1194
proto udp
dev tun
server 10.0.0.0 255.255.255.0   #you may choose any subnet. 10.0.0.x is used for this example.

ca ca.crt                    #certs are optional. you may choose to go with keys or passwords instead.
cert my-server.crt
key my-server.key 
dh dh1024.pem

push "redirect-gateway def1"

push "dhcp-option DNS 8.8.8.8"

#the following commands are optional
keepalive 10 120         
comp-lzo                   
persist-key               
persist-tun               
verb 3                     


Client.ovpn

Code: Select all

client
dev tun
proto udp
remote public.ip.of.winXP.server 1194   

resolv-retry infinite
nobind
persist-key
persist-tun

ca ca.crt
cert client.crt
key client.key
ns-cert-type server

comp-lzo
verb 3
explicit-exit-notify 2
ping 10
ping-restart 60

route-method exe
route-delay 2


Windows XP settings for forwarding VPN traffic

Code: Select all

Start -> Right-click My Computer -> Manage
Services
Right-click Routing and Remote Access -> Properties -> Automatic
Right-click Routing and Remote Access -> Start

Next:

Control Panel
Network Connections
Local Area Connection   (or whichever is your primary Internet interface [with your WAN ip])
Properties
Advanced
Tick the box "Allow other network users to connect through this computer's Internet connection"
From the drop-down list select "Local Area Connection 2", or whatever is the connection name of your TAP OpenVPN server interface.

Start->run->regedit (you type regedit)*

Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
Value: IPEnableRouter
Type: REG_DWORD
Data: 0x00000001 (1)

*Since this is Windows XP, you should restart Windows after making changes to registry


Notes:
  • This is very similar Windows 7 solution. If you know an easier or more efficient set of methods, please do share. If you know a proper method for forwarding DNS, also please do share.
The cure for boredom is curiosity

fourwed
OpenVpn Newbie
Posts: 5
Joined: Wed Mar 21, 2012 12:00 pm

Re: Windows XP as OpenVPN server with redirect-gateway

Postby fourwed » Wed Mar 21, 2012 1:38 pm

I am using the same method by turning on the Internet connection sharing (ICS) to the TAP interface in my windows xp (OpenVPN server). It works fine.

Recently, I have upgraded my Internet to 200M and I want to utilize all bandwidth without upgrading my wifi router. Therefore, I am planning to plug the 200M WAN directly to my windows xp (OpenVPN server) and then share it to other computers in my home via another LAN interface. This means that I will using my windows xp as a router.

My question is, is there any solution to replace the "ICS to TAP interface", so that I could release the ICS to another LAN interface?

bee_kay
OpenVpn Newbie
Posts: 2
Joined: Fri Apr 20, 2012 11:58 pm

Re: Windows XP as OpenVPN server with redirect-gateway

Postby bee_kay » Sat Apr 21, 2012 12:04 am

1) Great job Bebop! It's *almost* exactly what I need, just the wrong flavor of OS - I need a CentOS configuration example.
2) Search tools, and Index, are quite poor, and won't let me search for the same functionality for LINUX host.
3) I am newbie to this tool, and need this instantly if not sooner, so any URLs, topic IDs, or configuration suggestions would be greatly appreciated.

bee_kay
OpenVpn Newbie
Posts: 2
Joined: Fri Apr 20, 2012 11:58 pm

Re: Windows XP as OpenVPN server with redirect-gateway

Postby bee_kay » Sat Apr 21, 2012 12:06 am

Sorry for not reading more closely! I just spotted your "remember in Linux, these files are .conf"
-Bee Kay-

scarabeuz
OpenVpn Newbie
Posts: 3
Joined: Tue Mar 19, 2013 12:16 pm

Re: Windows XP as OpenVPN server with redirect-gateway

Postby scarabeuz » Wed Mar 20, 2013 1:31 pm

after completing this guide openvpn client will not get the public IP of the Windows XP server, is it right?

jmarshallh
OpenVPN User
Posts: 14
Joined: Wed Apr 03, 2013 1:57 am

Re: Windows XP as OpenVPN server with redirect-gateway

Postby jmarshallh » Fri Apr 05, 2013 9:37 pm

hi, just questions about this tuto :

_ when activate ICS , your LAN is 198.168.0.0 ?
_ i read that a new ip is created 192.168.0.1 and that we CAN'T modify it, so if my lan is 192.168.10.0 it won't work
_ when i read your conf : i didn't notice a tun device : where is the line dev-node ?
_ i tried what you explain and it doesn't work for me ! maybe problem of lan 192.168.10.0 ?

thanks for ideas ....

jmarshallh
OpenVPN User
Posts: 14
Joined: Wed Apr 03, 2013 1:57 am

Re: Windows XP as OpenVPN server with redirect-gateway

Postby jmarshallh » Fri Apr 05, 2013 9:59 pm

edit : i understand that dev node is not necessarily needed :) sorry :oops:

GC23
OpenVPN User
Posts: 12
Joined: Mon Jun 10, 2013 6:51 pm

Re: Windows XP as OpenVPN server with redirect-gateway

Postby GC23 » Wed Jun 12, 2013 2:59 pm

Thank you for this tutorial, it helped me a lot with my XP settings and I was able to successfully browse the internet over my vpn server.

One question I had, however, (as I am trying to understand the processes involved) is what does the line:

push "dhcp-option DNS 8.8.8.8"

do from a networking standpoint exactly?

charmander
OpenVPN User
Posts: 16
Joined: Sat Oct 05, 2013 10:20 pm

Re: Windows XP as OpenVPN server with redirect-gateway

Postby charmander » Mon Oct 14, 2013 11:19 pm

Bebop,

There is a problem with your instructions.

Control Panel
Network Connections
Local Area Connection (or whichever is your primary Internet interface [with your WAN ip])
Properties
Advanced
Tick the box "Allow other network users to connect through this computer's Internet connection"
From the drop-down list select "Local Area Connection 2", or whatever is the connection name of your TAP OpenVPN server interface.


There is no drop down list in the xp network location you talk about. After you check "allow other network users....", there is a "settings" button. When you click this, you are presented with "select the services running on your network that internet users can access". There are some common ones there already that you can enable, but none are "local area connection 2" or your VPN interface.

You can hit "add", where you are expected to enter the information manually. It would be helpful if you explained what should be entered there.

kshutch
OpenVpn Newbie
Posts: 1
Joined: Wed Jun 18, 2014 6:13 pm

Re: Windows XP as OpenVPN server with redirect-gateway

Postby kshutch » Wed Jun 18, 2014 6:26 pm

I am not sure exactly how or why, but the select list will show in XP. I did not see it at first, none of the services in the settings list were what I needed either.

I was previously trying to do all of this using netsh, so I had to undo those changes (if you did nothing with netsh before this, then do not worry about it)

I then went back into the Local Area Connection properties-->Advanced and ticked to allow others to connect to this internet connection.

I had my other local area connection that the tap drive is on turned off (just not connected) and then I clicked to add a service. I made the
service called opvn, on the computers name I was at (), with the default openvpn ports 1194 for both internal and external. When I hit ok on this window, then ok on the service list window, the select list then showed as mentioned above. I was then able to select the Local Area Connection associated with the tap driver.

I am going to remove everything I did and redo it to make a guide...this whole process took me almost 6 hours to figure out and that is a long time for me. I connected to another network though, checked my ip, then connected to open vpn and my ip was changed.

This certainly works though the tinkering-with-it factor is pretty high.


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