Anti-brute force to those using firewalld?

[Bruno Wolff III]

On Thu, Mar 06, 2014 at 11:20:16 -0500,
   David Mehler <dave.mehler at gmail.com> wrote:
>Hello,
>
>To those running firewalld as opposed to the older iptables static
>firewall setup, FC20, what do you use for stopping anti brute force or
>port knockings on your systems? I use to use fail2ban but it appears
>it does not work with firewalld.

Strong passwords.
Limited source IP addresses.
Requiring a key and password.