just download one of the firewall distros that have the built in
pfSense (FreeBSD) or IPCop (Linux) are the first 2 to mind.
ClarkConnect is another good one though it may have limited
functionality without paying, I don't know for sure. But we paid for
it at work and it works really well for doing that.
--
“Don't eat anything you've ever seen advertised on TV”
- Michael Pollan, author of "In Defense of Food"