很好的一个基于linux平台的防火墙软件 -A very good firewall based on linux platform

HIDS入侵检测系统 OSSEC源代码，跨平台，支持防火墙联动，文件完整性检测，rootkit检测-OSSEC is a scalable, multi-platform, open source Host-based Intrusion Detection System (HIDS). It has a powerful correlation and analysis engine, integrating log analysis, file integrity checking, Win