Iptables
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Installing iptables
iptables is a secure, robust open-source firewall solution for linux.
$ sudo emerge -av iptables
To ban the IP x.x.x.x,
$ sudo iptables -I INPUT -s x.x.x.x -j DROP
To ban a range of IPs starting with x.x.x,
$ sudo iptables -A INPUT -s x.x.x.0/24 -j DROP