Stop Adware and Malware Web Products

Snort is an open source network intrusion detection system, capable of performing real-time traffic analysis and packet logging on IP networks. It can perform protocol analysis, content searching/matching and can be used to detect a variety of attacks and probes, such as buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts, and much more.
price label Free to download, Rules Subscription (Personal): $29.99/year, Rules Subscription (Business): $399/year.