@e06c1f25 From what I remember, we moved to other forms of port management when changing iptables required too much potential breakage. (nftables, e.g.)

I think some distros, instead, just put wrappers around iptables rather than use the new stuff (e.g. I think ufw was/is just a front end that works with both ptables nftables?)

Take that with a grain of salt, because I've been using firewalld and ufw almost exclusively for over a decade, because they were always "good enough". 

 @b2f27659 i was surprised by all the replies about firewalls because somehow I forgot that people use iptables to configure firewalls :) (I've mostly used it for NAT and weird container stuff)