Apparently, if you are not using one of the official distros, there is no option for a firewall. And that’s okay I hope I can install my own fail2ban.
Are there any recipe instructions on how to do it? ubuntu 20.04 with Asterisk and Freepbx. Would like to ban those who use brute force to repeatedly try to access the server.
When using Fail2ban with other iptables firewall, the resulting rules order order is important, use csfpost.sh to start Fail2ban after CSF starts and csfpre.sh to stop it, if it running, before starting CSF
I will add that if you are not using UDP/5060 , they will both be as busy as the Maytag repairman.