This article covers some useful CSF SSH Command Line Commands in a “cheat sheet” format.

CommandDescriptionExample
csf -sStart the firewall rules[email protected][~]#csf -s
csf -fFlush/Stop firewall rules (note: lfd may restart csf)
[email protected][~]#csf -f
csf -rRestart the firewall rules[email protected][~]#csf -r
csf -a [IP.add.re.ss] [comment]Allow an IP and add to /etc/csf/csf.allow
[email protected][~]#csf -a 187.33.3.3 Home IP Address
csf -tr [IP.add.re.ss]Remove an IP from the temporary IP ban or allow list.
[email protected][~]#csf -tr 66.192.23.1
csf -tfFlush all IPs from the temporary IP entries
[email protected][~]#csf -tf
csf -d [IP.add.re.ss] [comment]Deny an IP and add to /etc/csf/csf.deny[email protected][~]#csf -d 66.192.23.1 Blocked This Guy
csf -dr [IP.add.re.ss]Unblock an IP and remove from /etc/csf/csf.deny[email protected][~]#csf -dr 66.192.23.1
csf -dfRemove and unblock all entries in /etc/csf/csf.deny[email protected][~]#csf -df
csf -g [IP.add.re.ss]Search the iptables and ip6tables rules for a match (e.g. IP, CIDR, Port Number)[email protected][~]#csf -g 66.192.23.1
csf -t Displays the current list of temporary allow and deny IP entries with their TTL and comment [email protected][~]#csf -t

Whitelisting an IP Address

In order to prevent specific IP from being blocked, even for a temporary deny, you need to list their IP address in the files csf.ignore and csf.allow. The first step is to enable IGNORE_ALLOW in csf.conf. The value for IGNORE_ALLOW will appear as “0″, you will need to adjust it to “1″ and restart csf and lfd.

This will allow lfd to reference csf.ignore. If you add an IP address to csf.ignore, the IP address will no longer be checked by lfd and failed login attempts will not trigger temporary denies.