Implementing the Collector
Enough theory, enough planning. Let's install something!
An Internet search reveals any number of freely available flow collectors. The big three are cflowd, flowd, and flow-tools. Cflowd is obsolete, is unsupported, and doesn't compile on 64-bit systems. I have high hopes for flowd, but it's a comparatively new tool and doesn't yet have broad support among users or third-party software. That leaves us with flow-tools, the most commonly used flow management tool kit.
Flow-tools is older but has a very broad user community. The original author (Mark Fullmer) released version 0.68 in 2005 and went on to other projects. Any unmaintained software slowly becomes obsolete, but a group of users assumed responsibility for flow-tools ...
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