http://www.openvpn.net/index.php/open-source/downloads.html OpenVPN 2.1.0 -- released on 2009.12.11 (Change Log) Changes include: * OpenVPN GUI is now packaged in the Windows installer. * Extensions to Management Interface to allow greater programmatic control of OpenVPN client and server. * topology subnet option, allowing intuitive tun-based VPN subnets having 1 IP address per client. * DHCP proxy support for Windows clients using the route-gateway dhcp option. * TAP-Win32 adapter can now be opened from non-administrator mode. * PKCS #11 features for usage of cryptographic tokens ("smart cards"). * multihome option to enable UDP-based multihoming of the server on multiple interfaces. * port-share option to allow OpenVPN and an HTTPS server to share TCP port 443. * Users upgrading from 2.x should note that the new script-security option must be set to enable OpenVPN to run scripts.