Netfilter

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Explore the main themes, entities and connections around Netfilter. Start with the topic map, then use the sections below for research and deeper semantic analysis.

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History

Rusty Russell Ipchains GPL-related disputes Linux kernel mainline Harald Welte

15 related topics

Connection tracking

Sessions Connectionless-mode transmissions UDP IPsec GRE

12 related topics

Userspace utility programs

Virtual machine ABI Code duplication Error reporting Atomic

5 related topics

Further Netfilter projects

IP addresses SYN floods Netlink API

4 related topics

Key facts & relationships

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License: GNU GPL
Operating system: Linux
Release: 26 August 1999; 26 years ago (1999-08-26) (Linux 2.3.15)
Stable release: 7.2 / 16 August 2026; 8 days ago (16 August 2026)
Type: Linux kernel module · Packet filter/firewall
Written in: C

Topics to explore

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Overview

Framework Software framework
Linux kernel
Networking Computer network
Packet filtering Packet filter
Network address translation
Port translation
Prohibiting Firewall (computing)
Hooks Hooking
Kernel modules Kernel module
Callback Callback (computer programming)

History

Rusty Russell
Ipchains
GPL-related disputes GNU General Public License
Linux kernel mainline
Harald Welte
Embedded Embedded system
Routers Router (computing)
German Germany
Injunction
Sitecom Sitecom?action=edit&redlink=1
Ipfwadm Ipfwadm?action=edit&redlink=1
BSD
Ipfw
IPv4
IPv6

Userspace utility programs

Virtual machine
ABI Application binary interface
Code duplication
Error reporting Error message
Atomic Atomicity (database systems)

Packet defragmentation

ALGs Application-level gateway

Connection tracking

Sessions Session (computer science)
Connectionless-mode transmissions Connectionless-mode transmission
UDP User Datagram Protocol
IPsec
GRE Generic Routing Encapsulation
Tunneling protocols Tunneling protocol
FTP
Invalid Invalid packet
TCP state TCP connection
ICMP
IP fragmentation
TCP segmentation TCP segment

Further Netfilter projects

IP addresses IP address
SYN floods SYN flood
Netlink
API

Advanced semantic analysis

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Map overview Semantic statistics

Nodes54

Edges53

Triples132

Avg. degree1.96

Density0.037037

Components1

How this topic connects Entity context

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Netfilter

Top relations

related to history · 18

Netfilter → As, August, German, GNU General Public License, GPL, GPL's, GPL-related, Harald Welte, In April, In August, In September, Linux, Netfilter Core Team, Patrick McHardy, Rusty Russell, Sitecom Germany, The, Welte

related to Connection tracking · 13

Netfilter → AH/ESP, Connection, Even, GRE, IPsec, NAT, One, Part, SCTP's, TCP, TCP's, The, UDP

see also · 11

Netfilter → API, Berkeley Packet FilterGeniatech, Free, IPVS, LVS, McHardy, NetfilterLinux Virtual Server, Netlink, PF, Uncomplicated Firewall, Virtual Server

related to External links · 9

Netfilter → Iptables, Linux, Netfilter Workshop, Network, October, Official, Rami Rosen, Stateful Firewalling, Writing Netfilter Modules

related to Connection tracking helpers · 8

Netfilter → For, FTP, In, IP, TCP, The, Through, When

related to ipset · 8

Netfilter → An IP, Connection Tracking, Different, IP, Linux, The, These, Unlike

related to SYN proxy · 8

Netfilter → By, Linux, November, On, SYN, SYNproxy, SYNPROXYtarget, This

related to iptables · 6

Netfilter → Any, As, Each, Notice, The, They

related to Network address translation · 6

Netfilter → Being, Each, If, IPv4, NAT, When

related to Packet defragmentation · 6

Netfilter → ALGs, IPv4, NAT, Netfilter's, The IPv6, This

Important terminology Word statistics

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Important terminology

connection packet tracking kernel packets linux nat set modules also iptables ip operations filtering ipchains network data used rules stack

Entity relationships Subject–Predicate–Object triples

Subject	Predicate	Object	Confidence	Src
Netfilter	License	GNU GPL	1.00	infobox
Netfilter	Operating system	Linux	1.00	infobox
Netfilter	Release	26 August 1999; 26 years ago (1999-08-26) (Linux 2.3.15)	1.00	infobox
Netfilter	Stable release	7.2 / 16 August 2026; 8 days ago (16 August 2026)	1.00	infobox
Netfilter	Type	Linux kernel module	1.00	infobox
Netfilter	Type	Packet filter/firewall	1.00	infobox
Netfilter	Website	netfilter.org	1.00	infobox
Netfilter	Written in	C	1.00	infobox
Netfilter	is a	framework provided by the Linux kernel that allows various networking-related operations to be implemented in the form of customized handlers	0.90	text
Connection Tracking.	instance of	It provides a table called raw that can be used to filter packets before they reach more memory-demanding operations	0.80	text
SELinux	instance of	Mandatory Access Control is implemented by Linux Security Modules	0.80	text
UDP	instance of	Even connectionless-mode transmissions	0.80	text

Related concept clusters Concept neighborhoods

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Connections between topic areas Semantic bridges

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Min side: 3