From Wikipedia, the free encyclopedia
ScreenShot OPNSense.png
DeveloperDeciso B.V.
OS familyFreeBSD (13.1-RELEASE)
Working stateCurrent
Source modelOpen source
Initial release2 January 2015; 8 years ago (2015-01-02)
Latest release23.1.6 ("Quintessential Quail") / April 19, 2023; 39 days ago (2023-04-19)[1]
Kernel typeMonolithic kernel
Influenced byM0n0wall. pfSense
LicenseSimplified BSD / FreeBSD License[2]
Official websiteopnsense.org
Support status
Community & Commercial

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. It is a fork of pfSense, which in turn was forked from m0n0wall built on FreeBSD.[3] It was launched in January 2015.[2] When m0n0wall closed down in February 2015 its creator, Manuel Kasper, referred its developer community to OPNsense.[4]

OPNsense has a web-based interface and can be used on the x86-64 platform.[5] Along with acting as a firewall, it has traffic shaping, load balancing, and virtual private network capabilities, and others can be added via plugins.[6] OPNsense offers next-generation firewall capabilities utilizing Zenarmor, a NGFW plugin developed by OPNsense partner[7] Sunny Valley Networks.[8]


In November 2017, a World Intellectual Property Organization panel found Netgate, the copyright holder of pfSense, used the domain opnsense.com in bad faith to discredit OPNsense, and obligated Netgate to transfer domain ownership to Deciso.[9]

See also[edit]


  1. ^ "OPNsense core 23.1". GitHub.
  2. ^ a b "Press release: Deciso Launches OPNsense, a New Open Source Firewall Initiative". Deciso via PRNewsWire. January 2, 2015.
  3. ^ Serdar Yegulalp. "Review: 6 slick open source routers". cio.com. Archived from the original on 20 December 2017. Retrieved 20 December 2017.
  4. ^ Richard Chirgwin (16 Feb 2015). "MOnOwall comes tumbling down". The Register. Wayback Machine. Archived from the original on 12 May 2019. Retrieved 12 May 2019.
  5. ^ "DistroWatch.com: OPNsense". DistroWatch. February 12, 2021.
  6. ^ Sharma, Mayank; Drake, Nate (September 26, 2017). "What's the best Linux firewall distro?". Linux Format via TechRadar.
  7. ^ "Partners". Sunny Valley Networks. Retrieved 29 December 2022.
  8. ^ "Zenarmor (Sensei): Overview — OPNsense documentation". OPNsense Documentation. Retrieved 29 December 2022.
  9. ^ "WIPO Domain Name Decision: D2017-1828". WIPO. November 12, 2017.

Further reading[edit]

External links[edit]