How to install csf

How to install csf:


tar zxvf csf.tgz
cd csf

To test all the iptable modules are available


If you are running apf_bfd firewall, it has to be removed for csf works


To configure csf config file to implement firewall as per our need

vi /etc/csf/csf.conf

(We will change it to zero “0″ when we finished and sure we have configured correctly)

TCP_IN = “20,21,22,25,53,80,110,143,443,465,587,993,995″
TCP_OUT = “20,21,22,25,53,80,110,113,443″
UDP_IN = “20,21,53″
UDP_OUT = “20,21,53,113,123″
(Put your all ports which you want to be open on your server for incoming & outgoing traffic seperated by comma)

PORTFLOOD = “80;tcp;20;5″
(To protect your server any specific port from DOS attacks, you can define it in PORTFLOOD tag. By default its empty and i did like to limit 20 connections per 5 sec to port 80 (webserver))

After this save the file and restart the csf service

# /etc/init.d/csf start

If you completed with configuation and sure that every rules is implemented correctly then change Testing from 1 to 0 for run CSF permanently.


and restart the service again to activate it

/etc/init.d/csf restart

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