If you are in security,you might have heard of an intrusion Detection System(IDS),which is a device or mechanism that moniters network and/or system activities for malicious or unwanted behaviour and can react,in real time,to block or prevent those activities.There are a lot of Professional IDS available for commercial use,but when it comes to being free as freedom(read:open source),Snort is my favourite.
Snort can be run in Four modes:
1.Sniffer mode:snort will read the network traffic and print them to the screen.
2.Packet Logger Mode:snort will record a traffic on a file.
3.IDS Mode:Network traffic matching security rules will be recorded.
4.IPS Mode:aslo known as snort-inline (IPS=intrusion prevention system)
Here is a Link:
http://www.mediafire.com/?r1sde9dnl11dose
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