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How to start
============
The nftables Debian package gives you access to the 'nft' utility.
There is another component, in the kernel, which is the nf_tables subsystem.
From the nft utility you control which rules are loaded into the kernel.
The Debian package comes with some example ruleset you may use as a starting
point. Check them at /usr/share/doc/nftables/examples/
Extensive online documentation is available at:
https://wiki.nftables.org
The default rules file in debian is /etc/nftables.conf
Some basic commands
===================
Try these basic commands to know more about nftables on your machine:
user@debian:~$ sudo nft list ruleset
user@debian:~$ sudo nft flush ruleset
user@debian:~$ sudo nft add table inet filter
user@debian:~$ sudo nft add chain inet filter input { type filter hook input priority 0 \; policy drop }
user@debian:~$ sudo nft add rule inet filter input ct state established counter accept
user@debian:~$ sudo nft list ruleset
System service (auto-load at boot)
==================================
This package includes a pre-configured systemd service file which you can
optionally enable to auto-load your firewall at boot time.
user@debian:~$ sudo systemctl enable nftables.service
Migrating from iptables
=======================
Please read the docs at:
https://wiki.nftables.org/wiki-nftables/index.php/Moving_from_iptables_to_nftables