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Thanks. Some commands seem to have the later-override-former model for overlapping rules, while some commands the first-win-over-latter model for overlapping rules . If I may ask, what kinds of commands are likely to use which model? Do you know any other models for resolving overlapping rules?

Tim
– Tim

2019-03-17 11:30:33 +00:00
Commented Mar 17, 2019 at 11:30
There’s no general rule. Models I can think of are “first match wins”, “last match wins”, “most specific wins”, I suppose one could imagine “least specific wins”; I don’t have examples off-hand for any of them.

Stephen Kitt
– Stephen Kitt

2019-03-17 13:23:28 +00:00
Commented Mar 17, 2019 at 13:23
Indeed, reading the man pages is one of the best ways. man iptables says "A firewall rule specifies criteria for a packet and a target. If the packet does not match, the next rule in the chain is the examined; if it does match, then the next rule is specified by the value of the target, which can be the name of a user-defined chain or one of the special values ... If the end of a built-in chain is reached or a rule in a built-in chain with target RETURN is matched, the target specified by the chain policy determines the fate of the packet. "

Jeff Schaller
– Jeff Schaller ♦

2019-03-17 19:53:22 +00:00
Commented Mar 17, 2019 at 19:53

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