Discover How To Secure My Network HOWTOs

Snort

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A one-of-a-kind content-based IDS tool that generates alerts to syslog and/or text files. Comes with more than 1100 attack signatures.

RFC2267: Defeating IP Spoofing

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RFC 2267, "Network Ingress Filtering: Defeating Denial of Service Attacks Which Employ IP Source Address Spoofing" by Paul Ferguson and Daniel Senie details methods for filtering spoofed packets on your network

IPTraf

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IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte c