Snort: IDS done well (and good)
Snort is, by far, the gold standard among open source NIDS systems, with over 100,000 users and 3 million downloads to date. Snort signatures are kept up-to-date by its dedicated users and the Snort website has ample documentation including tutorials. It is not, however, easy to use and requires an experienced security IT professional to configure it properly. The fact that it's free makes it the darling of small and medium-sized businesses that cannot afford the fancy GUIs and wizards of commercial network security products.
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