On Jul 27, 2021, at 16:43, H <agents@xxxxxxxxxxxxxx> wrote:
>
> |Running CentOS 7. I was under the impression - seemingly mistaken - that by adding a rule to /etc/hosts.deny such as ALL: aaa.bbb.ccc.* would ban all attempts from that network segment to connect to the server, ie before fail2ban would (eventually) ban connection attempts.
>
> This, however, does not seem correct and I could use a pointer to correct my misunderstanding. How is hosts.deny used and what have I missed?
>
> Is it necessary to run:
>
> iptables -I INPUT -s aaa.bbb.ccc.0/24 -j DROP
>
> to drop incoming connection attempts from that subnet?
Upstream openssh dropped support for tcp wrappers (hosts.deny) a while ago but RHEL had patched support back in for a while, but I believe it isn’t supported anymore.
For what it’s worth, if you use the fail2ban-firewalld package, it uses ipset rather than iptables, which is more efficient.
--
Jonathan Billings
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