Hello,
I am looking at replacing (or at least supplementing) my client's current use of Microsoft PPTP VPN on Small Business Server 2008 with OpenVPN. I downloaded and installed the latest stable 2.3 version of OpenVPN on the SBS2008 server, and was able to connect. I configured it in routed mode and to use <10.4.254.0/24>. All seemed to work fine, though I still have some tweaking to do, mostly to do with routing (currently only the SBS server itself can be reached). My client's LAN is <10.4.1.0/24>.
One of the users who currently use the PPTP VPN was unable to access anything on the LAN. Upon investigating, they were getting a <10.4.2.54.0/24> IP address; the subnet the OpenVPN is configured to use. I was unable to open the DHCP manger in Windows. I stopped the OpenVPN server and restarted DHCP and after some further fiddling was able to get a proper IP in the <10.4.1.0/24> range when connecting via PPTP.
I suspect the issue, of course, is that since OpenVPN has its own internal DHCP server which is likely interfering with the SBS one, which makes sense. After some further looking around, it seems that I may instead want to run the OpenVPN server in "bridged" mode so the clients get an IP from the Windows SBS server on the <10.4.1.0/24> range, and in fact, this would be preferred. The configuration seems pretty straightforward (
http://openvpn.net/index.php/open-source/documentation/install.html?start=1), but I did have one question regarding the creation of the bridged interface:
The current IP of the SBS server is <10.4.1.2>. Is that the IP address I should assign to the bridged interface?
One other question regarding the OpenVPN interfaces: I read in some older documentation that I had to create a seperate OpenVPN interface for each simultanous client I want to have connected, so if I wanted to have a maximum of ten clients connected I needed to create ten OpenVPN interfaces. Is this still the case?
Thanks! :-)
-SilkBC
