After the tremendously successful 2000 and 2003 security tools surveys, Insecure.Org is delighted to release this 2006 survey. I (Fyodor) asked users from the nmap-hackers mailing list to share their favorite tools, and 3,243 people responded. This allowed me to expand the list to 100 tools, and even subdivide them into categories. This is the category page for firewalls -- the full network security list is available here. Anyone in the security field would be well advised to go over the list and investigate tools they are unfamiliar with. I discovered several powerful new tools this way. I also point newbies to this site whenever they write me saying “I don't know where to start”.
Respondents were allowed to list open source or commercial tools on any platform. Commercial tools are noted as such in the list below. No votes for the Nmap Security Scannerwere counted because the survey was taken on a Nmap mailing list. This audience also biases the list slightly toward “attack” hacking tools rather than defensive ones.
Netfilter : The current Linux kernel packet filter/firewall
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