Often these days, we’re asked for a general rule of thumb or guidelines that can help with calculating NetFlow Volume.  How much disk space should an average NetFlow Deployment consume. One of the biggest concerns is that exporting NetFlow (or one of its cousins) for Network Performance Analysis will have a drastic impact on the available bandwidth, CPU overhead on devices, or on the hard drives storing it. This is simply not true.

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Since 2005, Plixer and Cisco have been touting NetFlow (not Net Flow) as an IT Security and threat detection solution. Cisco calls NetFlow the “primary network anomaly-detection technology” (pp4) and that “NetFlow allows the user to identify anomalies by producing detailed accounting of traffic flows”.  We are not the only ones with this belief. Even Symantec calls NetFlow a “valuable enhancement” to IDS (intrusion detection) and IPS (intrusion prevention). Read more »

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I came across this article in infosecisland.com on Securing PCs posted by Michelle Drolet who is the founder and CEO of Towerwall. In the post, she noted several interesting vulnerability facts that most businesses need to be aware of. Right off the top, I found these to be shocking:

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Businesses with IT Teams managing tens of thousands of IP addresses often find it more difficult to track down IP addresses and for this reason, they would rather work with a username. Identity Aware NetFlow ties the two together. In this post, lets take an example of tracking down the root cause of a network security issue or detected threat.
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Mike Patterson (Plixer CEO and Founder) and I have been long time colleagues in the arena of NetFlow analysis. Over the years we’ve both watched as NetFlow has matured and gained increasing popularity and I’ve always admired Mike and his team’s energy and steadfast devotion to NetFlow technology. Read more »

DNSChanger  is a type of DNS Malware  that infected about 4 million PCs computers and many of which (~300,000) are still infected.  Those still unaware of the problem will lose Internet connectivity on Monday July 9th.  More than 100 command and control (C&C) systems have been confiscated by the Federal Bureau of Investigation (FBI) but, this will not stop the outage.

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Most companies agree that business Internet security systems are a paramount concern.  Relying on traditional security efforts such as firewalls and antivirus software are not going to perform a very important emerging security detection technique called network behavior analysis.  To leverage this internal security measure, network administrators need to collect and analyze NetFlow or IPFIX from existing routers and switches.  And here’s some good news: firmware upgrades are usually not needed to take advantage of flow technology.

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Sign up for Advanced NetFlow Training™ coming to a city near you!

- What will be the main use for NetFlow?

- Is real-time reporting or historical reporting more important?

- Is it  traffic analysis including application and user monitoring?

- How much are you willing to pay for the product?

- Do your switches/routers support NetFlow?

- Is scalability a concern?

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You probably have NetFlow enabled on your network devices, but the question is, are you truly taking advantage of what it offers? From working in technical support, I noticed, although NetFlow technology is evolving rapidly, when it comes to understanding how the technology works and how much can be accomplish with it, many users are staying behind. Today I want to give you a few tips. Read more »

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