admin wrote:


Wrong: the implied "check-state" done by the "limit" lets the connection through (i.e. performs the action) iff there's state recorded for it (src-addr+src-port+dst-addr+dst-port). If however it's a SYN packet incoming and the number of current states is trying to cross the limit, the SYN packet is implicitly dropped and the search terminates.

This is not to say that I completely understand the things going on when the connections start building up (different timeouts?) but the above conclusion is based on what simulation has shown. The whole ruleset fits on one screen, there's an "allow ip from any to any" in the end, so I'm pretty sure I'm not crazy :-)

One thing to keep in mind is that a 'check-state' rule works by effectively jumping to the rule that did the 'keep-state' and re-executing it..
(and incrementing its stats).


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