Private Firewall (PFW) includes a component known as Dynamic Security Agent (DSA). DSA used to be available as a stand-alone application, but has since been made an integral part of PFW. However, copies of stand-alone DSA still exist, and are quite viable even today. The following summary of stand-alone DSA's capabilities is still valid: Thus, stand-alone DSA has strong Firewall capabilities PLUS its 4 Modules provide superb anomaly-blocker capabilities. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The following is a compendium of tests & discussions concerning DSA: http://membres.multimania.fr/nicmtests/Dynamic-Security-agent-tests/DSA_index.htm http://www.wilderssecurity.com/showthread.php?t=179889 http://www.wilderssecurity.com/showthread.php?t=161400 http://www.wilderssecurity.com/showpost.php?p=924198&postcount=16 (by a VIP from Private FW's proponent) http://www.wilderssecurity.com/showthread.php?p=925697 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here is a screenshot of a summary of test results by the (in)famous Matousec site. I have DSA version 188.8.131.52 (the last stand-alone AFAIK) whereas Matousek tested using version 184.108.40.206. If you visit Matousec's site to view DSA's test results in the context of other tested apps, please take special note that little DSA surpassed "pure" FWs by a mile, & also did quite well when compared with full-on FW+HIPS apps. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ P.S. Per Greg, Tech Support guru with Privacyware.com, DSA does not filter IPv6 traffic (just passes it through). He further stated that this capability does not exist in Privatefirewall at this time either, but will be added during 4th quarter (Oct-Dec) this year.