On Thu, 29 Jun 2017 20:08:20 -0600, JD wrote:

> >>> iptables -t filter -A IN_public_deny -p tcp --dport pop3s --syn -m 
> >>> recent --name pop3s_attack --rcheck --seconds 90 --hitcount 2 -j LOG 
> >>> --log-prefix 'SSH2 REJECT: ' --log-level info   
> >> My iptables replied:
> >> iptables: No chain/target/match by that name.
> >>
> >> How is it created?  
> >
> > How is WHAT created? I'm snowed!
> > --doug  
> The CHAIN Doug.
> iptables says there is no such chain to add a new rule to.
> 
> In this case, the chain name is IN_public
> 
> I tried all capitals for the chain name, to no avail.

It's not a default filter chain, but a custom one that would need to
be created as part of a custom script running much more than that single
iptables command. If you've ever created a custom iptables script to
maintain multiple chains, those scripts can become very complex.
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