Traditionally in networking, we track down end systems by searching on IP addresses. Although this is a great way to narrow in on an end system, what do you do if the IP address changes? Would you benefit if you could associate the host IP to an actual … [Read more...] about Username Reporting – NetFlow Integration with Cisco ISE
Cisco Catalyst 9300 NetFlow Configuration
One device that I am beginning to see a lot more of at my customer sites is the Cisco Catalyst 9300. I figured that I would take this opportunity to walk through the Cisco Catalyst 9300 NetFlow configuration, and provide a sample reference document for … [Read more...] about Cisco Catalyst 9300 NetFlow Configuration
Configuring Flexible NetFlow to Monitor Network Activity
Over the past few weeks, I have taken a number of support calls from customers who were looking for help with their Cisco router Flexible NetFlow configuration. There were many times where the customer set up the record, but they did not build it to get the … [Read more...] about Configuring Flexible NetFlow to Monitor Network Activity
How to Set Up Enhanced Wireless Network Visibility
It has been several years since Cisco introduced wireless NetFlow support on their Wireless LAN Controller (WLC) platforms. Using the Application Visibility and Control functions, this export provided some unique visibility into the wireless network traffic, … [Read more...] about How to Set Up Enhanced Wireless Network Visibility
How to Detect ICMP Tunneling
Are you aware of any data tunneling that might be occurring in your network? Do you think that your network is totally secure? If your company network connects to the internet, there is a very good chance that your business is not safe from all forms of … [Read more...] about How to Detect ICMP Tunneling
Cumulus Networks sFlow Configuration
I have been working with a number of customers recently who use Cumulus Networks sFlow as a means to monitor network traffic.Cumulus Networks designs and sells a Linux operating system for industry standard network switches to deliver networking solutions … [Read more...] about Cumulus Networks sFlow Configuration
Avaya Wireless 8100 IPFIX Configuration
In many organizations, IPFIX is helping network administrators manage network performance by giving them insight into the wireless traffic traversing their networks. Today’s networks support a mix of guests, employees, and vendors. Without classifying and … [Read more...] about Avaya Wireless 8100 IPFIX Configuration
User vs. Predefined Flexible NetFlow
I wanted to take some time today to talk a little bit about some differences between user-defined and predefined Flexible NetFlow records.A big advantage of the Flexible NetFlow concept opposed to traditional NetFlow is that the user can define the … [Read more...] about User vs. Predefined Flexible NetFlow
Cisco Nexus 7000 NetFlow Sampling
With most devices that sample NetFlow, there is an export of the sample rate in the flow record or an option template. The collector then uses that sampler information to multiply results (packet and byte counts) to arrive at traffic use numbers that more … [Read more...] about Cisco Nexus 7000 NetFlow Sampling
What is DNS Tunneling?
DNS tunneling, is the ability to encode the data of other programs or protocols in DNS queries and responses.The concept of DNS tunneling was originally designed as a simple way to bypass the captive portals at the network edge. But as with many things on … [Read more...] about What is DNS Tunneling?
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