Banning IP Addresses for abuse

For banning with an expiry fail2ban can be used, the expiry time depends on the configured fail2ban jail:

fail2ban-client set sshd banip 1.1.1.1

To permanently ban an IP address firewall-cmd can be used as shown below:

firewall-cmd --add-rich-rule="rule family='ipv4' source address='1.1.1.1' reject" --zone=public

firewall-cmd --add-rich-rule="rule family='ipv6' source address='1:2:3:4:6::' reject" --zone=public

Note that on Gitlab, you must block the ip address for the docker zone:

firewall-cmd --add-rich-rule="rule family='ipv4' source address='1.1.1.1' reject" --zone=docker

To see the bans/rules:

firewall-cmd --list-all

To remove a banned IP Address:

firewall-cmd --remove-rich-rule='rule family="ipv6" source address="1:2:3:4:6::" reject' --zone=public