nftables

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nftables is the candidate for replacing iptables as the main Linux firewall utility from Linux kernel version 3.13 and on.

Currently, nftables is available on the AUR in package nftables-gitAUR.

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: nftables is an entirely new utility, and lacks sufficient documentation on this wiki, as well as elsewhere. (Discuss in Talk:Nftables#)

Overview

nftables consists of three main components: a kernel implementation, the libnl netlink communication and the nftables userspace frontend. The kernel provides a netlink configuration interface, as well as runtime ruleset evaluation using a small classification language interpreter. libnl contains the low-level functions for communicating with the kernel, the nftables frontend is what the user interacts with.

Usage

Drop output to a destination:

# nft add rule ip filter output ip daddr 1.2.3.4 drop

Drop packet to port 80:

# nft add rule ip filter input tcp dport 80 drop

Delete all rules in a chain:

# nft delete rule filter output

Further reading