PeerGuardian is a privacy oriented firewall application. It blocks connections to and from hosts specified in huge blocklists (thousands or millions of IP ranges). Its origin seeds in targeting aggressive IPs while you use P2P.
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PeerBlock Alternatives for Linux
PeerBlock is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The best Linux alternative is PeerGuardian, which is both free and Open Source. If that doesn't work for you, our users have ranked five alternatives to PeerBlock, but unfortunately only two of them are available for Linux. If you can't find an alternative you can try to remove all filters.
Alternatives list
iplist is a Linux application for blocking connections to and from a specified range of hosts using the netfilter netlink-queue library. iplist is an open source IP filtering program similar to PeerGuardian .
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Discontinued but still available, and still an alternative.