--On Monday, April 03, 2017 8:05 PM +0100 Dominic Raferd 
<domi...@timedicer.co.uk> wrote:

> ​I'm not familiar with firewalld, but if it is like ufw then it is just
> a way of passing instructions to iptables and it should be possible for
> fail2ban to pass its own instructions directly to iptables alongside
> firewalld, and they need not conflict.

The terminology can be confusing. The underlying kernel implementation is 
called netfilter, and implements the raw iptables rules. iptables is the 
userspace utilities for manipulating netfilter. iptables tends to disrupt 
existing connections. firewalld is a higher-level set of rules that also 
manipulate netfilter but in a way that allows easy dynamic changes without 
disrupting existing connections. You can still use iptables commands to 
inspect the changes to netfilter that firewalld makes. But you generally 
should avoid using iptables to make changes as they won't be visible to 
firewalld's persistent state and won't be restored on reboots.



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