Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. VPN-1 VSX is a software package from Check Point Software Technologies Ltd, based on VPN-1.It allows to create multiple virtual firewalls, each one (referred to as a Virtual System) capable of processing traffic (Firewalling, NAT, VPN, etc) according to a separate set of configuration than the other Virtual Systems.VSX stands for Virtual System eXtension.