PeerGuardian was a program developed primarily for Windows that blocked connections made to your computer by computers on IP blacklists. This meant that hackers trying to trace your computer would be blocked if their IP was on the blacklist. This was also used eventually to help protect against copyright infringement, although this is not the program's primary function. There are various alternatives for Macs, with different levels of protection.
PeerGuardian for Mac
PeerGuardian was released for Macs, but it is difficult to find online at the time of publication. It is no longer officially supported and the original website is down. However, it can be downloaded from third-party sites, such as MacUpdate.
Little Snitch is a program that blocks all connections made by your computer by default. Each connection you make with your computer generates a permissions request. This is useful as it allows you to cater your browsing and computer use entirely to your personal preference.
If you use Transmission as your Torrent client, you can block common IP addresses from the Preferences. Click "Preferences," "Peers," "Prevent..." and then "Automatically update weekly."
Like Transmission, the Vuze client has the same ability with IP blocking. Open Preferences, then click "IP Filters." Click "Auto" to begin blocking. Click "OK" to complete.
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