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Packet filter software
PF (Packet Filter, also written pf) is a BSD licensed stateful packet filter, a central piece of software for firewalling. It is comparable to netfilter
PF_(firewall)
Firewall/Router software distribution
pfSense is a firewall/router computer software distribution based on FreeBSD. The open source pfSense Community Edition (CE) and pfSense Plus is installed
PfSense
Operating system
corporate-sponsored software projects. The firewall code in Apple's macOS is based on OpenBSD's PF firewall code, Android's Bionic C standard library is
OpenBSD
Packet filtering software
recommends the module approach, if possible. ipfw iptables NPF (firewall) PF (firewall) The full license text can be found from IPFILTER.LICENCE file of
IPFilter
Topics referred to by the same term
PF) .pf, internet country code for French Polynesia PF (firewall), OpenBSD's stateful packet filter PF keys, a type of function keys on old keyboards Page
PF
Computer firewall protocol
synchronise firewall states between machines running Packet Filter (PF) for high availability. It is used along with CARP to make sure a backup firewall has the
Pfsync
This is a list of router and firewall distributions, which are operating systems designed for use as routers and/or firewalls. List of open-source routing
List of router and firewall distributions
List_of_router_and_firewall_distributions
Computer networking term
older versions) it supports reversed path source validation via its pf firewall, using the urpf-failed option, while Free-, Net-, and DragonflyBSD provide
Host_model
Intrusion prevention software framework
whenever an abusive IP address is detected: update Netfilter/iptables or PF firewall rules, TCP Wrapper's hosts.deny table, to reject an abuser's IP address;
Fail2ban
Linux firewall software
Linux portal nftables NPF (firewall) PF (firewall) ipfirewall (ipfw) ipfilter XDP ipchains Uncomplicated Firewall (firewall) Pablo Neira Ayuso (4 March
Iptables
IPv4 to IPv6 transition technology
Internet Name Domain DNS server, implements DNS64 since version 9.8 PF (firewall), the OpenBSD packet filter supports IP version translation since version
List of IPv6 transition mechanisms
List_of_IPv6_transition_mechanisms
Firewall distribution
OPNsense is an open source, FreeBSD-based firewall and routing software developed by Deciso, a company in the Netherlands that makes hardware and sells
OPNsense
Firewall software
ipfw was the built-in firewall of Mac OS X until Mac OS X 10.7 Lion in 2011 when it was replaced with the OpenBSD project's PF. Like FreeBSD, ipfw is
Ipfirewall
Packet alteration framework for Linux and the umbrella project for software of the same
another low-level component of the network stack NPF (firewall) PF (firewall) Uncomplicated Firewall Greg Kroah-Hartman (3 October 2026). "Linux 7.2.9".
Netfilter
Firewall distribution
requirements pfSense: Forked from the m0n0wall project in 2004, first released in 2006. OPNsense: Forked from pfSense in 2015. Other usages (not a firewall) AskoziaPBX:
M0n0wall
Packet filter software
packet filter, a central piece of software for firewalling. It is comparable to iptables, ipfw, ipfilter and PF. NPF is developed on NetBSD. NPF was primarily
NPF_(firewall)
QOS) and NAT all related traffic Netopia Netopia supports ALG PF, built-in OpenBSD firewall PF can handle the NAT through the "static-port" directive and
List_of_SIP_software
Computer networking feature
while the packets are traversing a network gateway, such as a router or firewall. This technique is most commonly used to make services on a host residing
Port_forwarding
Computer software for running local area networks
as firewall (PF) and load-balancing functionality. OpenWrt used to route IP packets on embedded devices pfSense, a fork of M0n0wall, which uses PF OPNsense
Network_operating_system
Type of computer attack
of allowing an attacker to map the internal address ranges in use.) A firewall (e.g. dnswall), in the gateway or in the local pc, can filter DNS replies
DNS_rebinding
of "Helith" released several security advisories affecting OpenBSD, PF firewall, OpenSSH, NetBSD and vendors like Netgear or Nortel. On July 30, 2007
Helith
kernel List of free and open-source software packages List of router and firewall distributions List of router firmware projects OpenBSD NetBSD Software
Comparison of router software projects
Comparison_of_router_software_projects
Command-line software
"Keeping an Eye on Things with systat". The Book of PF, 3rd Edition: A No-Nonsense Guide to the OpenBSD Firewall. No Starch Press. ISBN 9781593276218. systat(1)
Systat_(BSD)
USB stick for NetBSD". Retrieved 2025-04-14. "Welcome to the NetBSD/i386 Firewall Project". Retrieved 2025-02-09. "A fast, open and Secure desktop Operating
List_of_BSD_operating_systems
Computer network protocol
traffic can be easily configured to make hosts placed behind NATs or firewalls reachable from the rest of the Internet (so they can also act as network
Port_Control_Protocol
Free and open-source VPN protocol
management interfaces (including easier setting up of keys), logging, dynamic firewall updates, dynamic IP assignment, and LDAP integration. It is supported natively
WireGuard
Secure network protocol suite
zero-day exploits at the time of their exposure. The Cisco PIX and ASA firewalls had vulnerabilities that were used for wiretapping by the NSA. Furthermore
IPsec
Network scheduler for Berkeley Software Distribution
OpenBSD 5.4 and earlier PF and ALTQ documentation by the FreeBSD project pfSense Documentation ALTQ Scheduler Types on pfSense Firewall /sys/net/altq/altq
ALTQ
Hansteen, Peter N. M. (19 November 2010). The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall (2nd ed.). No Starch Press. p. 167. ISBN 978-1-59327-274-6
OpenBSD_Journal
Free and open-source virtual private network software
exchange. It is capable of traversing network address translators (NATs) and firewalls. OpenVPN has been ported and embedded on several systems. For example
OpenVPN
Free and open-source Unix-like operating system
FreeBSD ships with three different firewall packages: IPFW, pf and IPFilter. IPFW is FreeBSD's native firewall. pf was taken from OpenBSD and IPFilter
FreeBSD
OPNsense – Open source and free firewall, fork of pfSense and successor to m0n0wall pfSense – Open source and free network firewall distribution Beckhoff TwinCAT/BSD
List of products based on FreeBSD
List_of_products_based_on_FreeBSD
functions IPFire – Advanced firmware written from scratch with customizable firewall and optional packages in the form of add ons. TNSR – Router software from
List of router firmware projects
List_of_router_firmware_projects
on FreeBSD. pfSense – an open source firewall/router computer software distribution based on FreeBSD. OPNsense – an open source firewall/router computer
Comparison of BSD operating systems
Comparison_of_BSD_operating_systems
Computer processor developed by Texas Instruments
community. Nest, a learning thermostat Netgate SG-1000, a micro firewall based on pfSense MOD/MOD Live, makes GPS-enabled Micro Optics Displays (MOD)
Sitara_ARM_processor
American software engineer (born 1966)
tmpfs UFS soft updates Vinum VFS Firewalls, networking 802.11 drivers ALTQ Bluetooth BPF CARP ipfw NDIS netgraph PF Subsystems busdma DPorts ioctl kqueue
Matthew_Dillon
distribution tweaked for usage as a firewall. pfSense free open source FreeBSD based firewall/router. OPNsense, firewall, a fork of pfSense Coyote Point Systems
History of the Berkeley Software Distribution
History_of_the_Berkeley_Software_Distribution
News leak publishing organisation
2013. Retrieved 20 October 2009. Oates, John (18 March 2009). "Aussie firewall blocks Wikileaks". The Register. London. Archived from the original on
WikiLeaks
Open source software project
The pfSense project published a road map on 25 February 2015, in which developer Jim Thompson announced the rewriting of the pfSense core—including pf, network
Data_Plane_Development_Kit
National intelligence agency of Israel
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Mossad
Anti-spam technique involving deliberately delaying responding to connections
3.3, with a special-purpose daemon (spamd) and functionality in the firewall (pf) to redirect known spammers to this tarpit. MS Exchange can tarpit senders
Tarpit_(networking)
Open source mesh networking protocol
package for tinc. OPNsense, an open source router and firewall distribution, has a plugin for Tinc pfSense has an installable package in the 2.3 release
Tinc_(protocol)
Principal security agency of Russia
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Federal_Security_Service
Way to traverse IP address spaces without routing
layer addresses. If the host making the request lies behind a simple NAT firewall, the translation of the IP address or TCP port number makes the information
Network_address_translation
Extension of a private network across a public one
in the open source operating systems devoted to firewalls and network devices (like OpenWrt, IPFire, PfSense or OPNsense), it is possible to add support
Virtual_private_network
Foreign intelligence agency of Pakistan
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Inter-Services_Intelligence
Set of networking protocols
site. This only applies to the "firewall-hole-punching"-feature of UPnP; it does not apply when the router/firewall does not support UPnP IGD or has
Universal_Plug_and_Play
Series of pickup trucks manufactured by Ford
footprint. Aluminum body stampings replaced steel with the exception of the firewall. The frame itself remained high-strength steel. To test the durability
Ford_F-Series
Overview of and topical guide to computer security
Next-Generation Firewall Virtual firewall Stateful firewall Context-based access control Dual-homed IPFilter Zone Alarm Linux firewall capabilities Debian
Outline_of_computer_security
Anglosphere intelligence alliance
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Five_Eyes
Organelle in eukaryotic cells responsible for respiration
insulating mitochondria from high Ca2+ exposure, the MAM often serves as a firewall that essentially buffers Ca2+ puffs by acting as a sink into which free
Mitochondria
Brazilian federal police
of planning, coordination and control. For the operational activities, the PF has 27 regional superintendents (the office in a state capital), 95 Federal
Federal_Police_of_Brazil
Free general-purpose operating system
on its Beaglebone Black board's flash. Roqos Core, a x86-64 based IPS firewall router, runs on Debian Linux. Debian's policies and team efforts focus
Debian
Mechanism to wake up computers via a network
router, and port forwarding rules may need to be configured in its embedded firewall in order to accept magic packets coming from the internet side to these
Wake-on-LAN
Intelligence agency of Japan
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
National Intelligence Bureau (Japan)
National_Intelligence_Bureau_(Japan)
PPPoE driver. OpenSolaris has support for a TUN driver with TAP support firewall is not supported on Hurd kernel for now ipv6 is not supported on Hurd kernel
Comparison of open-source operating systems
Comparison_of_open-source_operating_systems
Open-source implementation of ZFS file system
to ZFS pools, as of version 2.4. OPNsense, an open source FreeBSD based firewall and router distribution, supports ZFS, including installation and booting
OpenZFS
Intelligence body of the Israel Defense Forces
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Military Intelligence Directorate (Israel)
Military_Intelligence_Directorate_(Israel)
Israel's internal security service
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Shin_Bet
Russian military intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
GRU_(Russian_Federation)
Agency dealing with secret intelligence
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Intelligence_agency
Former Libyan national intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Mukhabarat_el-Jamahiriya
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
List_of_intelligence_agencies
India's domestic intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Intelligence_Bureau_(India)
U.S. DoD combat support agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Defense_Intelligence_Agency
Services Module is based on the ProCurve ONE Module, and is primarily a firewall with additional Intrusion-prevention system and VPN capabilities ProCurve
List_of_ProCurve_products
Military intelligence service of Ukraine
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Main Directorate of Intelligence (Ukraine)
Main_Directorate_of_Intelligence_(Ukraine)
Belarusian national intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
State Security Committee of the Republic of Belarus
State_Security_Committee_of_the_Republic_of_Belarus
Device used to perform financial transactions
ATMs have a built-in firewall. Once the firewall has detected malicious attempts to break into the machine remotely, the firewall locks down the machine
ATM
Intricate surveillance of an entire or a substantial fraction of a population
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Mass_surveillance
British foreign intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
MI6
Intelligence-gathering by interception of signals
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Signals_intelligence
British signals intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
GCHQ
Firewalld Uncomplicated Firewall (ufw) Firestarter IPFilter ipfw iptables nftables IPFire LEAF Project M0n0wall PeerGuardian PF pfSense OPNsense Rope Shorewall
List of free and open-source software packages
List_of_free_and_open-source_software_packages
U.S. Army's branch for military intelligence
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Military Intelligence Corps (United States Army)
Military_Intelligence_Corps_(United_States_Army)
Foreign intelligence agency of Germany
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Federal_Intelligence_Service
Russian intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Foreign Intelligence Service (Russia)
Foreign_Intelligence_Service_(Russia)
Intelligence unit of the Israel Defense Forces
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Unit_8200
Information about military opponents
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Military_intelligence
U.S. signals intelligence organization
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
National_Security_Agency
Syrian intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
General Intelligence Service (Syria)
General_Intelligence_Service_(Syria)
Indian external intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Research_&_Analysis_Wing
Disclosures of NSA and related global espionage
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Snowden_disclosures
Intelligence agency of South Korea
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
National Intelligence Service (South Korea)
National_Intelligence_Service_(South_Korea)
Military intelligence agency in the Netherlands
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Netherlands Defence Intelligence and Security Service
Netherlands_Defence_Intelligence_and_Security_Service
British domestic intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
MI5
U.S. intelligence and covert action agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Central_Intelligence_Agency
Windows Firewall Yes Yes Yes 0 0 0 0 0 [Unknown] Windows 8.1 ACLs, privileges, RBAC Win32 WindowStation, desktop, job objects Windows Firewall Yes Yes
Comparison of operating systems
Comparison_of_operating_systems
Medical imaging technology
of four major components: The imaging modalities such as X-ray plain film (PF), computed tomography (CT) and magnetic resonance imaging (MRI), a secured
Picture archiving and communication system
Picture_archiving_and_communication_system
Law enforcement and counter-terrorism agency of the Swedish government
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Swedish_Security_Service
Foreign intelligence service of the German Democratic Republic
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Main Directorate for Reconnaissance
Main_Directorate_for_Reconnaissance
Technical intelligence agency of India
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
National Technical Research Organisation
National_Technical_Research_Organisation
Intelligence Agency in Singapore
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Internal Security Department (Singapore)
Internal_Security_Department_(Singapore)
Controversies involving the Central Intelligence Agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
List_of_CIA_controversies
Tri-service military intelligence agency of India
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Defence Intelligence Agency (India)
Defence_Intelligence_Agency_(India)
French interior intelligence agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
General Directorate for Internal Security
General_Directorate_for_Internal_Security
Government ministry of Iran
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Ministry of Intelligence (Iran)
Ministry_of_Intelligence_(Iran)
Rwandan security agency
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
National Intelligence and Security Service (Rwanda)
National_Intelligence_and_Security_Service_(Rwanda)
Motor vehicle
front bulkhead. The wagon version was also changed, although from the firewall back the vehicle remained the same as the previous version. Their new 'Sirius'
Mitsubishi_Galant
Imperial secret police of the Ming dynasty
intelligence agencies) Leaks Diplomatic cable leaks NSA leaks CIA leaks Great Firewall of China Mass surveillance in China Law enforcement Interpol Security agency
Embroidered_Uniform_Guard
travel, tourism, insurance
PF FIREWALL
PF FIREWALL
PF FIREWALL
PF FIREWALL
PF FIREWALL
PF FIREWALL
PF FIREWALL
PF FIREWALL
PF FIREWALL
travel, tourism, insurance