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Source: O'Reilly Network - Posted by Pete O'Hara   
Intrusion Detection This is the third in a series of excerpts from Chapter 7 of Incident Response, published in August 2001 by O'Reilly. This excerpt covers two tools used by sysadmins to detect when hackers are trying to access your network. You can use these tools to detect hackers before they do any damage.. . . This is the third in a series of excerpts from Chapter 7 of Incident Response, published in August 2001 by O'Reilly. This excerpt covers two tools used by sysadmins to detect when hackers are trying to access your network. You can use these tools to detect hackers before they do any damage.

Snort is neither just a protocol analyzer nor an intrusion detection system (IDS). It is a little of both, and can be very useful in incident response operations. Many of its features are similar to the TCPdump/Review combination mentioned above, but Snort has enough differences to discuss on its own. Like Ethereal, Snort is freely available in source code form under the GNU General Public License, for most Unix and Linux variants and distributions. However, unlike Ethereal, Snort is not a beta release. At the time of this writing, Snort is up to Version 1.7. What's more, Snort has an active community of users that freely exchange ideas and rulesets. For further information, see http://www.snort.org.

Read this full article at O'Reilly Network

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