Block and manage IP blacklists easily with PeerGuardian for Mac OS X
PeerGuardian is a free open source tool that allows you to easily block large numbers of IP addresses in Mac OS X. It automatically maintains an internal IP blacklist to block IP’s deemed unsafe or dubious in nature, and also allows for multiple IP lists with the ability to block entire protocols. Other features include logging and maintenance tools to see what exactly is being blocked. Many people use PeerGuardian in conjunction with an extensive external IP blacklist when using P2P file sharing applications and networks to better maintain their security and privacy.
Many Mac users are surprised to note that Apple.com is a blocked IP in the PeerGuardian IP list, but HTTP and FTP traffic from Apple.com will flow through fine (ie: websites, Software Update, Apple web services, iCal, etc). This can lead to some problems with other Apple accessed servers though, like .Mac mail, some iChat traffic, and the Network Time Protocol. Of course you can manually edit the IP block list and remove Apple entirely if this is too restrictive for your needs.
If you’re a heavy P2P user, you’d likely benefit from downloading and installing PeerGuardian.
PeerGuardian is also available as a free download for Windows and Linux if you’d like to install it on other platforms.