> In my understanding, fail2ban only collects stats on individual IPs.
> I have seen suggestions to change the action to block the entire
> /24 for a bad IP in some situations.  That sort of helps, but doesn't
> help aggregate the "hits" on the jails in the first place.
>
> Here are a couple of other posts on the subject:
>
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=724274


Check out this message:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=724274#25

It sounds like I can just edit action.d/iptables.conf like this:

old:
actionban = <iptables> -I f2b-<name> 1 -s <ip> -j <blocktype>
new:
actionban = <iptables> -I f2b-<name> 1 -s <ip>/24 -j <blocktype>

and it will ban the entire subnet instead of just the IP.  Am I
reading that right?

- Grant

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