Barry Brimer wrote on Sat, 20 Jun 2009 22:51:44 -0500 (CDT):
Many years ago I used portsentry for this. You can find an article about portsentry at http://www.securityfocus.com/infocus/1580
and can be downloaded here: http://sourceforge.net/project/showfiles.php?group_id=80573
Kai