Bringing Platform Harmony to VMware NSX

VMware NSX virtualizes network functionality in a manner anal- ogous to how hypervisors virtualize compute resources. To do this, NSX must faithfully recreate virtual versions of network compo- nents, such as switches, routers, and firewalls. As this functionality becomes commoditized, NSX must move "up the stack" to provide more advanced features, such as load-balancers, IDS/IPS (intrusion detection and prevention systems), and DPI (deep packet inspec- tion) for classification. NSX is designed to work in all types of deployments-even those without any other VMware software. It integrates with ESXi, Linux KVM, and Hyper-V hypervisors; it is even being made to work on systems without a hypervisor, such as containers and third- party clouds. Each of these platforms has its own native forwarding plane. For the best user experience, all of the forwarding planes should provide the same behavior, but the disparate implemen- tations make this difficult in practice. As network functions be- come more complex and as NSX supports more forwarding planes, both duplication of effort and undesirable diversity of behavior in- creases. We propose a new approach to building advanced network func- tions in NSX. Under this approach, identical code runs on all of NSX's supported platforms. Applications will run at or near native performance, but with better security and identical cross-platform behavior. We demonstrate this by writing a single application to provide DPI functionality that runs in the fast paths of each of NSX's primary platforms: ESXi, Linux, and Edge gateway appli- ance. We evaluate the performance and correctness of our imple- mentation on the three platforms.