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Welcome to the ''nftables'' HOWTO documentation page. Here you will find documentation on how to build, install, configure and use nftables.
Welcome to the ''nftables'' HOWTO documentation page. Here you will find documentation on how to build, install, configure and use nftables.


This documentation was initially started by Eric Leblond, known as the [https://home.regit.org/netfilter-en/nftables-quick-howto/ nftables quick HOWTO], and it has been extended and enhanced by Pablo Neira Ayuso.
If you have any suggestion to improve it, please send your comments to Netfilter users mailing list <netfilter@vger.kernel.org>.


If you have any suggestion to improve it, please send your comments to Netfilter users mailing list <netfilter@vger.kernel.org>.


Note that this documentation is still under development, so '''consider this work in progress'''.
= [[News]] =
 


= Introduction =
= Introduction =
* [[What is nftables?]]
* [[How to obtain help/support]]


* [[What is nftables?]]
* [[Why nftables?]]
* [[Main differences with iptables]]
* [[Netfilter hooks]] and integration with existing Netfilter components.


= Getting started =
= Reference =
* [https://www.netfilter.org/projects/nftables/manpage.html man nft - netfilter website]
* [https://www.mankier.com/8/nft man nft - mankier.com]
* [[Quick reference-nftables in 10 minutes|Quick reference, nftables in 10 minutes]]
* [[Netfilter hooks]] and nftables integration with existing Netfilter components
* [[nftables families|Understanding nftables families]]
* [[Data_types|Data types]]
* [[Connection_Tracking_System|Connection tracking system (conntrack)]], used for stateful firewalling and NAT
* [[Troubleshooting|Troubleshooting and FAQ]]
* [[Further_documentation|Additional documentation]]
 


= Installing nftables =
* [[nftables from distributions|Using nftables from distributions]]
* [[Building and installing nftables from sources]]
* [[Building and installing nftables from sources]]
* Using [[nftables from distributions]]
 
* [[Troubleshooting|Troubleshooting and FAQ]]
 
* [[Quick reference-nftables in 10 minutes|Quick reference, nftables in 10 minutes]]
= Upgrading from xtables to nftables =
* [[Legacy xtables tools]]
* [[Moving from iptables to nftables]]
* [[Moving from ipset to nftables]]
 


= Basic operation =
= Basic operation =
* [[Configuring tables]]
* [[Configuring tables]]
* [[Configuring chains]]
* [[Configuring chains]]
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* [[Scripting]]
* [[Scripting]]
* [[Ruleset debug/tracing]]
* [[Ruleset debug/tracing]]
* [[Ruleset debug/VM code analysis]]
* [[Output text modifiers]]


= Supported selectors for packet matching =
= Expressions: Matching packets =
 
* [[Matching packet header fields]]
* [[Matching packet metainformation]]
* [[Matching packet metainformation]]
* [[Matching packet headers]]
* [[Matching connection tracking stateful metainformation]]
* [[Matching connection tracking stateful metainformation]]
* [[Matching routing information]]
* [[Rate limiting matchings]]
* [[Rate limiting matchings]]


= Possible actions on packets =


= Statements: Acting on packet matches =
* [[Accepting and dropping packets]]
* [[Accepting and dropping packets]]
* [[Rejecting traffic]]
* [[Jumping to chain]]
* [[Jumping to chain]]
* [[Rejecting traffic]]
* [[Counters]]
* [[Logging traffic]]
* [[Logging traffic]]
* [[Performing Network Address Translation (NAT)]]
* [[Performing Network Address Translation (NAT)]]
* [[Setting packet metainformation]]
* [[Setting packet metainformation]]
* [[Setting packet connection tracking metainformation]]
* [[Mangling packet headers]] (including stateless NAT)
* [[Duplicating packets]]
* [[Load balancing]]
* [[Queueing to userspace]]
* [[Queueing to userspace]]
* [[Duplicating packets]]
* [[Mangle packet header fields]]
* [[Counters]]


Note that, unlike ''iptables'', you can perform several actions in one single rule.


= Advanced data structures for performance packet classification =
= Advanced data structures for performance packet classification =
You will have to redesign your rule-set to benefit from these new nice features:
* [[Sets]]
* [[Dictionaries]]
* [[Intervals]]
* [[Intervals]]
* [[Maps]]
* [[Concatenations]]
* [[Concatenations]]
* [[Flow tables]]
* [[Math operations]]
* [[Updating sets from the packet path]]
* [[Stateful objects]]
* [[Element timeouts]]
** [[Counters]]
** [[Quotas]]
** [[Limits]]
** [[Connlimits]] (''ct count'')
* Other objects
** [[Conntrack helpers]] (''ct helper'', Layer 7 ALG)
** [[Ct_timeout|Conntrack timeout policies]] (''ct timeout'')
** [[Ct_expectation|Conntrack expectations]] (''ct expectation'')
** [[Synproxy]]
** [[Secmark|Secmarks]]
* Generic set infrastructure
** [[Sets]]
** [[Element timeouts]]
** [[Updating sets from the packet path]]
** [[Maps]]
** [[Verdict_Maps_(vmaps) | Verdict maps]]
** [[Meters|Metering]] (formerly known as flow tables before nftables 0.8.1)
* [[Flowtables]] (the fastpath network stack bypass)


If you are already using [[ipset]] in your ''iptables'' rule-set, that transition may be a bit more simple to you.


= Examples =
= Examples =
* [[Simple ruleset for a workstation]]
* [[Simple ruleset for a workstation]]
* [[Simple ruleset for a server]]
* [[Simple ruleset for a home router]]
* [[Bridge filtering]]
* [[Bridge filtering]]
* [[Multiple NATs using nftables maps]]
* [[Multiple NATs using nftables maps]]
* [[Classic perimetral firewall example]]
* [[Port knocking example]]
* [[Classification to tc structure example]]
* [[Using configuration management systems]] (like puppet, ansible, etc)
* [[GeoIP matching]]
= Development =


= Development progress =
Check [[Portal:DeveloperDocs|Portal:DeveloperDocs - documentation for netfilter developers]].
 
Some hints on the general development progress:


* [[List of updates since Linux kernel 3.13]]
* [[List of updates since Linux kernel 3.13]]
* [[List of updates in the nft command line tool]]
* [[Supported features compared to xtables|Supported features compared to {ip,ip6,eb,arp}tables]]
* [[Supported features compared to xtables|Supported features compared to {ip,ip6,eb,arp}tables]]
* [[List of available translations via iptables-translate tool]]
* [[List of available translations via iptables-translate tool]]


= Videos =
 
= External links =
 
Watch some videos:


* Watch [https://www.youtube.com/watch?v=FXTRRwXi3b4 Getting a grasp of nftables], thanks to [https://www.nluug.nl/index-en.html NLUUG association] for recording this.
* Watch [https://www.youtube.com/watch?v=FXTRRwXi3b4 Getting a grasp of nftables], thanks to [https://www.nluug.nl/index-en.html NLUUG association] for recording this.
* Watch [https://www.youtube.com/watch?v=CaYp0d2wiuU#t=1m47s The ultimate packet classifier for GNU/Linux], thanks to the FSFE for paying my trip to Barcelona and for recommending me as speaker to the KDE Spanish branch.
* [https://www.youtube.com/watch?v=Sy0JDX451ns Florian Westphal - Why nftables?]
* Watch [https://www.youtube.com/watch?v=0wQfSfDVN94 NLUUG - Goodbye iptables, Hello nftables]
Watch videos to track updates:
* Watch [https://www.youtube.com/watch?v=qXVOA2MKA1s Netdev 2.1 - Netfilter mini-workshop (2017)]
* Watch [https://youtu.be/iCj10vEKPrw Netdev 2.2 - Netf‌ilter mini-workshop (2018)]
* Watch [https://youtu.be/0hqfzp6tpZo Netdev 0x12 - Netf‌ilter mini-workshop (2019)]
* Watch [https://www.youtube.com/watch?v=GqGGo4svj7s&feature=youtu.be Netdev 0x14 - Netfilter mini-Workshop (2020)]
Additional documentations and articles:
* Tutorial [https://zasdfgbnm.github.io/2017/09/07/Extending-nftables/ Extending nftables by Xiang Gao]
* Article [http://ral-arturo.org/2017/05/05/debian-stretch-stable-nftables.html New in Debian stable Stretch: nftables]
* Article [https://ral-arturo.org/2020/11/22/python-nftables-tutorial.html How to use nftables from python] and git repository [https://github.com/aborrero/python-nftables-tutorial python-nftables-tutorial.git]


= Thanks =
= Thanks =
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[https://nlnet.nl https://nlnet.nl/image/logo.gif]
[https://nlnet.nl https://nlnet.nl/image/logo.gif]
To Eric Leblond, for boostrapping the [https://home.regit.org/netfilter-en/nftables-quick-howto/ Nftables quick howto] in 2013.

Latest revision as of 14:47, 12 October 2024

Welcome to the nftables HOWTO documentation page. Here you will find documentation on how to build, install, configure and use nftables.

If you have any suggestion to improve it, please send your comments to Netfilter users mailing list <netfilter@vger.kernel.org>.


News

Introduction


Reference


Installing nftables


Upgrading from xtables to nftables


Basic operation

Expressions: Matching packets


Statements: Acting on packet matches


Advanced data structures for performance packet classification


Examples

Development

Check Portal:DeveloperDocs - documentation for netfilter developers.

Some hints on the general development progress:


External links

Watch some videos:

Watch videos to track updates:

Additional documentations and articles:


Thanks

To the NLnet foundation for initial sponsorship of this HOWTO:

logo.gif

To Eric Leblond, for boostrapping the Nftables quick howto in 2013.

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