Access "Mining NetFlow"
This article is part of the January 2006 issue of How to stop data leakage
Your routers and switches can yield a mother lode of security information about your network--if you know where to dig. Excavating endless logs to detect malicious network activity is a lot like mining for gold-- randomly digging holes to find a nugget or two isn't very efficient. Your search will be a lot more fruitful if you know what to look for and where to look for it. Fortunately, data generated by NetFlow, a de facto UDP-based traffic reporting protocol, yields a rich vein of specific information about data flow--source and destination IP addresses and port numbers, protocol and service types, and the router input interface. Mining NetFlow data can still be extremely difficult, but a handful of free and/or relatively inexpensive tools allow you to hit pay dirt by easily sorting, viewing and analyzing the information you want to use. The results can help you identify and shut down everything from spam to botnets. This technique is particularly valuable for ISPs, but can produce invaluable security information in any organization. Drilling Operations ... Access >>>
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