To block a traffic from a certain ip address to your machine because eg. it's doing a hacking:
- Check DNS of this address to be sure you're not blocking someone important:
$ dig ip_address
- Add new rule in iptables:
$ iptables -A INPUT -s ip_address -j DROP
- In Redhat based distributions (Fedora, CentOS, Enterprise Linux):
$ service iptables save
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