Eventually I used more detailed diagrams, but this one was like a lightbulb going off: https://www.frozentux.net/iptables-tutorial/images/tables_traverse.jpg h

Eventually I used more detailed diagrams, but this one was like a lightbulb going off: https://www.frozentux.net/iptables-tutorial/images/tables_traverse.jpg https://www.frozentux.net/iptables-tutorial/images/tables_tr... I couldn’t find one that annotated where sysctl configurable were shown. But this is a useful annotation, even if it’s an exercise for the reader.