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pfSense is a firewall/router computer software distribution based on FreeBSD. The open source pfSense Community Edition (CE) and pfSense Plus is installed on a physical computer or a virtual machine to make a dedicated firewall/router for a network. [ 3 ]
FreeBSD derivative, fork of pfSense: x86-64: FreeBSD License: Free or paid: Forward caching proxy, traffic shaping, intrusion detection, two-factor authentication, IPsec and OpenVPN [1] pfSense: Active: FreeBSD derivative, fork of m0n0wall: x86-64, ARM: Closed & Open source licenses: Free as PfSense CE or paid on Netgate Devices as PfSense Plus
VMware ESXi (formerly ESX) is an enterprise-class, type-1 hypervisor developed by VMware, a subsidiary of Broadcom, for deploying and serving virtual computers.As a type-1 hypervisor, ESXi is not a software application that is installed on an operating system (OS); instead, it includes and integrates vital OS components, such as a kernel.
pfSense: Apache 2.0 / Proprietary (Plus) Free / Paid FreeBSD-based appliance firewall distribution Zeroshell: GPL: Free / Paid Linux/NanoBSD-based appliance firewall distribution SmoothWall: GPL: Free / Paid Linux-based appliance embedded firewall distribution IPFire: GPL: Free (Donations welcomed) Linux-based appliance embedded firewall ...
Some other products such as VMware and Virtual PC use similar approaches to Bochs and QEMU, however they use a number of advanced techniques to shortcut most of the calls directly to the CPU (similar to the process that JIT compiler uses) to bring the speed to near native in most cases.
Full virtualization was not fully available on the x86 platform prior to 2005. Many platform hypervisors for the x86 platform came very close and claimed full virtualization (such as Adeos, Mac-on-Linux, Parallels Desktop for Mac, Parallels Workstation, VMware Workstation, VMware Server (formerly GSX Server), VirtualBox, Win4BSD, and Win4Lin Pro).
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A virtual firewall (VF) is a network firewall service or appliance running entirely within a virtualized environment and which provides the usual packet filtering and monitoring provided via a physical network firewall.