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Open source: Free with paid services available: Zentyal is an open-source router/firewall and small business server. Zeroshell: Discontinued: Linux distribution: x86, ARM: GPL V2: Free (contribution required for some graphing functions) Web-administrative router/firewall live CD with QoS features.
OPNsense is an open source, FreeBSD-based firewall and routing software developed by Deciso, a company in the Netherlands that makes hardware and sells support packages for OPNsense. Launched in 2015, [ 2 ] it is a fork of pfSense , which in turn was forked from m0n0wall built on FreeBSD . [ 3 ]
m0n0wall – Embedded firewall software package [2] NAS4Free – Open source storage platform [2] NomadBSD – a persistent live system for USB flash drives, based on FreeBSD. [2] OPNsense – Open source and free firewall, fork of pfSense and successor to m0n0wall [7] pfSense – Open source and free network firewall distribution [2]
These alternatives are not yet known to have compatibility issues between different clients and servers, but adoption is still low. For consumer routers, only AVM and the open source router software projects OpenWrt, OPNsense, and pfSense are currently known to support PCP as an alternative to UPnP.
NAT types Full-cone NAT, or NAT 1, also known as one-to-one NAT. Once an internal address (iAddr:iPort) is mapped to an external address (eAddr:ePort), any packets from iAddr:iPort are sent through eAddr:ePort. Any external host can send packets to iAddr:iPort by sending packets to eAddr:ePort. (Address-)Restricted-cone NAT, or NAT 2
It was the second open source BSD descendant to be formally released, after 386BSD, and continues to be actively developed. Noted for its portability and quality of design and implementation, it is often used in embedded systems and as a starting point for the porting of other operating systems to new computer architectures.