pfilter

pfilter controls network packet filtering on a Linux computer.

pfilter makes it easy to build firewalls on computers, including ones that protect many computers hidden behind the firewall.

For officially released software downloads and other project information, see:

http://sourceforge.net/projects/pfilter/

For unofficial development releases, see:

ftp://sponge.ncsa.uiuc.edu/pfilter/