nftables - Replacement of the 'iptables' framework

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nftables

Installed with the Debian package

nftables

Usage

nftables :

replaces the iptables framework (source).
is available upstream since Linux 3.13 (January 2014, source).
is used as the default framework by Debian Buster (source).
see example : /usr/share/doc/nftables/examples/overview.nft and others

Source : https://wiki.nftables.org/
Source : Quick reference-nftables in 10 minutes
Source : https://en.wikipedia.org/wiki/Nftables