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Monthly Archives: April 2009

William Fisher, CTO – Video Blog

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Why NetFlow is Better than tcpdump

Tcpdump, and its graphical kin “sniffer” programs (such as Wireshark, OmniPeek, Ethereal, etc.), can give very deep view into the network traffic, showing the details of every packet. These tools are essential for debugging low-level interactions between devices. Although it … Continue reading >>

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Why NetFlow is Better than SNMP

Most network monitoring software can retrieve lots of data about a device using SNMP. In particular, it’s quite easy to get the volume of traffic flowing through various interfaces by reading the statistics from MIB-II. This shows total bits/bytes per … Continue reading >>

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What if I don’t have Cisco/NetFlow-compatible Equipment?

Not all routers and switches support NetFlow. For example, only certain models of Cisco equipment provide NetFlow data; many other manufacturer’s gear will not export NetFlow records, either. If you use non-NetFlow capable equipment, there are a few alternatives/workarounds: Use … Continue reading >>

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What Good is NetFlow?

Using the data from one or more NetFlow exporters, the NetFlow collector can then piece together what sessions or conversations have occurred. For example, it can show that: HostA sent 1kbyte to HostB from port 32123 to port 80 HostB … Continue reading >>

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An Overview of New Features in InterMapper 5.1

As director of software development at Dartware, I am involved in the day-to-day process of listening to our customers, understanding what they really need and want from network monitoring software, and directing the development team to make sure high-priority needs … Continue reading >>

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