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What (who) is packet filter - definition
FIREWALL PROGRAM FOR BSD SYSTEMS
PacketFilter; Packet Filter; Pf (firewall); Pf firewall; /dev/pf
Firewall (computing)
![Flow of [[network packet]]s through [[Netfilter]], a [[Linux kernel]] module](https://commons.wikimedia.org/wiki/Special:FilePath/Netfilter-packet-flow.svg?width=200 "Flow of [[network packet]]s through [[Netfilter]], a [[Linux kernel]] module")
NETWORK SECURITY SYSTEM THAT MONITORS AND CONTROLS INCOMING AND OUTGOING NETWORK TRAFFIC BASED ON PREDETERMINED SECURITY RULES
Network layer firewall; Packet filter; Packet filtering; Firewall (networking); Firewall (computer); Network firewall; Host-based firewall; Deep packet filtering; Firewall software; Computer firewall
In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.
data packet
FORMATTED UNIT OF DATA CARRIED BY ALL PACKET-SWITCHING NETWORKS
Data packet; Data packets; Packet (information technology); Packet technology; Packet (computing); Packet (network); Packet data
Network packet
FORMATTED UNIT OF DATA CARRIED BY ALL PACKET-SWITCHING NETWORKS
Data packet; Data packets; Packet (information technology); Packet technology; Packet (computing); Packet (network); Packet data
In telecommunications and computer networking, a network packet is a formatted unit of data carried by a packet-switched network. A packet consists of control information and user data; the latter is also known as the payload.
Wikipedia
PF (firewall)
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 (iptables), ipfw, and ipfilter.
PF was developed for OpenBSD, but has been ported to many other operating systems.
