An intrusion detection system can be an effective technical control in the modern world of information and network security. One option that provides for low cost NIDS sensor deployment is the use of the open source IDS software Snort in combination with a consumer grade LinkSys cable/DSL router and the open source firmware distribution OpenWrt. These three items together form a powerful yet inexpensive unit that delivers IDS, routing, firewall, wireless, and NAT functionality for use in a light-weight environment, i.e. consumer or small business deployments.
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