Installing and Configuring CSF Firewall

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 Steps to Install CSF Firewall on Centos 7


Step 1: Downloading CSF Firewall Dependencies

yum install wget vim perl-libwww-perl.noarch perl-Time-HiRes


Step 2: Install CSF

Go to /usr/src


#cd /usr/src


Download CSF Firewall

#wget https://download.configserver.com/csf...

#tar -xvf csf.tar

#cd csf

#sh install .sh


Step 3: Checking CSF Working on server or not

#cd /usr/local/csf/bin/

#perl csftest.pl


If you see the test results as shown below, 

then CSF is running without problems on your server:


RESULT: csf should function on this server


Step 4: Configuring CSF Firewall on Centos 7


1. Stop Firewalld

#systemctl stop firewalld


2. Disable/Remove firewalld from the startup:


#systemctl disable firewalld


3. Then go to the CSF Configuration directory

"/etc/csf/" and edit the file "csf.conf" 

with the vim editor:


#cd /etc/csf/

#vim csf.conf


4. Change line 11 "TESTING " to "0" for applying the 

firewall configuration.


TESTING = "0"


5. By default CSF allows incoming and outgoing 

traffic for the SSH standard port 22, 

if you use a different SSH port then 

please add your port to the configuration 

in line 139 "TCP_IN".


6. Now start CSF and LFD with systemctl command:


#systemctl start csf

#systemctl start lfd


7. Enable CSF and LFD


#systemctl enable csf

#systemctl enable lfd


8. You can see the list default rules of CSF 

with command:


#csf -l


Step 5 Basic CSF Commands


Start the Firewall


#csf -s


Flush/stop firewall rules

#csf -f


Reload the Firewall Rules


#csf -f


Allow an IP and add it to csf.allow

#csf -a ipaddress


Remove an Ip

#csf -ar ipaddress


Advanced Configuration File


#cd /etc/csf

#vim csf.conf

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