As a system administrator you might often use CSF to block / unblock your server visitors. There are a lot of tutorials how to do that via GUI. Anyhow in this article I will share an easy way to administrate your firewall using command line.
Here are the most useful command flags I use all the time:
Deny an ip address:
csf -d xxx.xxx.xxx.xxx
Quick allow / whitelist an ip address:
csf -a xxx.xxx.xxx.xxx
Unblock an ip address and remove from the deny list:
csf -dr xxx.xxx.xxx.xxx
I hope you will find this information useful.
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