# This file contains (i) proprietary rules that were created, tested and certified by # Sourcefire, Inc. (the "VRT Certified Rules") that are distributed under the VRT # Certified Rules License Agreement (v 2.0), and (ii) rules that were created by
Nessus号称是\\\"世界上最流行的漏洞扫描程序，全世界超过75,000个组织在使用它\\\"。尽管这个扫描程序可以免费下载得到，但是要从Tenable Network Security更新到所有最新的威胁信息，每年的直接订购费用是$1,200。Linux，FreeBSD，Solaris，Mac OS X和Windows下都可以使用Nessus。Snort这个入侵检测系统(IDS)非常有效，以至于它已经成为世界上IDS中的No.1，并且被包含到许多商业产品中。除了可以免费下(的版本)，Sno
