iptables-p2p is a module that matches multiple P2P networks using iptables.
To install iptables-p2p, there are a few important steps you'll need to follow. First, you'll need to copy the iptables headers to an appropriate place or install the iptables-dev package (if available on your distro). Next, you'll want to run make to compile iptables-p2p. Once you've done that, you can insert the kernel/ipt_p2p.o module directly using insmod or copy it into your modules directory.
If you're using a 2.6 kernel, the module will be named kernel/ipt_p2p.ko. Finally, you'll need to insert the iptables library libipt_p2p.so into the iptables lib directory (usually located at /lib/iptables).
As for what's new in the most recent release (version 0.3.0a), there have been several bug fixes and improvements made. Specifically, this release has addressed issues with iptables-save/iptables-restore as well as module versioning support.
Overall, iptables-p2p is a valuable tool for anyone looking to work with peer-to-peer networks. With its easy installation process and continued updates and improvements, it's definitely worth checking out.
Version 0.3.0a: N/A