A few years ago, we added a behavioral algorithm to Plixer Scrutinizer that looked at all the flow data that was collected and determined if there was possible ICMP tunneling taking place. That algorithm alarmed if it determined that packet sizes were abnormal for ICMP traffic from a Windows or Linux platform.Read more
As resource demands and bandwidth speeds in many of today’s network infrastructures continue to increase, many network administrators believe that NetFlow sampling is the only way to deal with the high flow volume sent across the network. In fact, setting a NetFlow sample rate of 1 in 100 can cut flow volumes as much as 50%.Read more
I was working with a customer last week who had configured NetFlow on four of their Cisco routers. They had applied basically the same configuration to each of the routers, but only saw exported flows from three of them arrive at the collector.Read more
Lately, I have seen an increase in support calls regarding the increase in bandwidth consumption and the degradation of application performance seen when employees started working from home because of the coronavirus outbreak.Read more
Questions regarding deduplicated NetFlow often come up when beginning to research NetFlow solutions. This blog will address some of the reasons why deduplication might not be the best way to go.Read more
A common question that has been coming up on product demonstrations over the last few weeks is, using NetFlow, is there a way to track and locate a private host IP address behind my NAT routers?Read more
I am seeing a lot more of the Cisco Catalyst 9400 switches at my customer sites these days. I have also had a number of requests for configuration help. I figured that I would take this opportunity to walk through the Cisco Catalyst 9400 NetFlow configuration, and provide a sample reference document for you.
There is not much new here on configuring NetFlow. If you are familiar with the 3850 NetFlow configuration, it is very much the same.Read more
I want to introduce you to a very cool, very powerful search function for investigating IP Addresses.
We talk all the time about how NetFlow and IPFIX technologies fit very well in the behavior analysis side of a layered security solution.
NetFlow is a feature that provides the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data provided by NetFlow, a network administrator can determine things such as the source and destination of traffic, class of service, and causes of congestion (if any).
A few years ago, I wrote a blog that talked about how our Palo Alto NetFlow reporting allows network administrators to easily identify traffic trends occurring on the network. The application and username correlation reporting has proved to be extremely value to our customers using Palo Alto Networks as their firewall platforms.
Since then, we have added another reporting and analaysis dimension in regard to the Palo Alto NetFlow. We now use the username visibility to provide global username correlation to any IP address seen on any network device, anywhere on the network.