If your office uses multiple client platforms, such as Windows, Mac OS X, and Linux, then you may be having trouble finding one vpn software selection to satisfy this variety of systems. OpenVPN, a freely available open source product, was designed with cross platform compatibility in mind and runs on Linux, Solaris, OpenBSD, FreeBSD, NetBSD, Mac OS X, and Windows 2000/XP. It also supports the highest levels of encryption and is compatible with SSL VPN networks (that is, if you have an existing VPN network that uses IPSec, L2TP, or PPTP for encryption, you must either move the VPN over to SSL or you will not be able to use OpenVPN). Unfortunately, at the time of writing OpenVPN cannot act as a proxy for your web browser, so intranet pages served over your VPN will not automatically be visible when an IP tunnel with OpenVPN is open on your client system.
