I had operated a private server. The Server’s OS was Linux DEBIAN.
Cracking was critical problem to my Server Because I’m not professional. I could not find out whether the Sever was broken into…
So I had used the Linux’s iptables package.
Refer to next homepage. This site have the information for indivisual Country’s IP blocks. It can be used to configure the iptables.conf
http://www.countryipblocks.net
You can select the IP block’s display format. CIDR,Netmask,IP range and so on….
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