Snort is a libpcap-based packet sniffer/logger which can be used as a lightweight network intrusion detection system. It features rules based logging and can perform content searching/matching in addition to being used to detect a variety of attacks and probes, such as buffer overflows, stealth port scans, CGI attacks, SMB probes, and much more. Snort has a real-time alerting capabilty, with alerts being sent to syslog,a seperate "alert" file, or as WinPopup messages via Samba's smbclient.
deb50b6ec436be7b09681b55f0ebf8b7a4ba5a01eb08f20728c384ad9b9ba96c