Netfilter

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Conntrack

• Linux Kernel 5.12 (April 2021) netfilter packet-filtering mechanism now supports the idea of "ownership" of specific tables. This allows, for example, a firewall daemon to maintain exclusive control of the tables it manages.

See also

• iptables, ufw, firewalld, nftables firewall-cmd, netfilter-persistent, iptables -L, iptables-save, iptables-restore, Netfilter