Free NetFlow Software

Posted in NetFlow, NetFlow Analyzer, Network Health Report, Network Problem Resolution, Network Traffic Analysis, Network Traffic Monitor, Scrutinizer, Security, sFlow on January 26th, 2011 by Danny
Free NetFlow Software
There are many network management software applications with NetFlow reporting capability; however,  only few provide features that truly take advantage of available NetFlow information. When one is choosing a NetFlow reporting tool, it is important to consider certain factors:
- 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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How to enable egress NetFlow

Posted in NetFlow, Network Traffic Analysis on March 9th, 2010 by Paul
How to enable egress NetFlow

Working in technical support I get asked a lot, “I enabled NetFlow on my router, why don’t I see outbound traffic?” This is because NetFlow version 5 only supports ingress flow monitoring and they don’t have NetFlow enabled on all interfaces. In NetFlow v5 outbound traffic is calculated by the idea what goes in must go out (or stop at the router) so, it’s necessary that all interfaces are monitoring ingress traffic to get an accurate representation of outgoing traffic. So, if ingress monitoring has been working great all along why enable egress monitoring?

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Paul

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Using NetFlow to tell if your network is part of a botnet, Part 2

Posted in IT News, NetFlow, NetFlow Analyzer, Network Traffic Analysis, Network Traffic Monitor, Scrutinizer, Security on August 19th, 2009 by NewsTrax
Using NetFlow to tell if your network is part of a botnet, Part 2

This is the final part in a two-part blog series on using Cisco NetFlow to identify if your network is part of a botnet. Part 1 gave a quick overview of distributed denial of service (DDoS) attacks and how they’re often caused by botnets flooding Web sites with requests, thus making the Web site inaccessible to others.

It’s not just home computers that could be part of botnets. Any work computer could be compromised if users unwittingly download malware or visit malicious Web sites, putting corporate networks at risk.  How can Cisco NetFlow be used to identify DDoS attacks?
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