Simple answer using nftables rather than iptables. Other reason newer kernels now more fully able to deploy more nftables tuning options. Other reason, better processing access control in some cases, fully exposing process hooks and chains in a more humanly readable way than iptables. Mostly unnecessary for Linux Lite users, but an example of a conscientious developer choosing to move toward the future.
https://manpages.debian.org/buster/nftables/nft.8.en.htmlTC
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All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
