Policing Live video traffic and monitoring using NetFlow Analyzer


I hope everyone who had attended our joint webinar with Cisco about QoS Design and validation, would have got a better idea on how to design a network with effective QoS policing. For those who missed the Webinar, you can find the video presentation here.

In continuation to our Webinar, this blogs helps you in setting up QoS policies for Live Video Traffic and monitor them using NetFlow Analyzer.

On a network the Video traffic spread in three format:

  1. Video Conferencing

  2. Video On Demand

  3. Video Broadcast

Video traffic has very high and extremely variable packets rate with a much higher average maximum transmission unit (MTU) when comparing to Voice.

QoS Treatment:-

For classifying the Video traffic to appropriat…

Understanding IP Precedence, TOS & DSCP


People using NetFlow Analyzer wonder, what these reports DSCP, TOS actually means ? Here is the blog which explain more detail about these fields.

The NetFlow packets exported from the device originally contains ToS value on each flow. From the ToS value, the analyzing software derives the DSCP.

Type of Service (TOS):-

The Type of Service field is present in IP Header and it was originally defined in RFC 791.

The Type of Service octet consists of three fields. The last 3 bits ( 7,6,5) are for the first field, labeled “Precedence” , intended to denote the importance or priority of the datagram. The second field, labeled “TOS” , denotes how the network should make tradeoffs between thro…

Better QoS policies: Better Cost savings


Cost-effectiveness is the common term that we are hearing or seeing nowadays and this exists in all forms on the globe, In this tough economic situation the motive of Network Administrator should be optimizing the current infrastructure for future accommodation.

Optimization plays a major role when it comes to distributed network architecture or MPLS network. Most of the complaints from users at each location , Application usage is very slow at business hours, Ofcourse the possible reason might be due to other unwanted traffic consuming large amount of bandwidth over the business critical application.

We will have scenario based explanation to elaborate this problem of Network Administrator:


Application Performance Monitoring using NetFlow Analyzer


In most of the Corporate networks, the common problem seen over decades is that application performance worsens during business hours. Network Admin managing the corporate network faces the huge task of finding out what is causing the slowness in accessing the application hosted on a remote data center.

The application performance can degrade due to following reasons:

  1. Application installed server is not good enough (Related Hardware).

  2. Bandwidth availability is less when accessing from remote office

The first point can be troubleshooted using our ManageEngine tools like ManageEngine OpManager and ManageEngine Application Manager. We will concentrate on the 2nd Point which is our focus area, since

NetFlow Sampling on Cisco 6500 & 7600 series device


Both Cisco 6500 & 7600 serve as Core devices on a network to distribute large amount of traffic. The high volume of packets and packet rates of traffic on some device links which leads to more utilization of CPU and memory for performing traffic analysis in this scenario. One solution to avoid this problem is sampling. Sampling defines that instead of every packet, 1 out of N packets (where N is the sampling rate) is captured and sent to the NetFlow Analyzer for traffic analytics. Based on the information in 1 packet, the traffic pattern for the rest of the packets is constructed.

The sampling rate is indicated in a header field of NetFlow version 5 (same sampling rate fo…

Enhanced per IP Address based Alert in NetFlow Analyzer


Our previous blog was about various alerts in NetFlow Analyzer. In this blog we will discuss the alerting mechanism in NetFlow Analyzer.

Network Administrators managing any corporate network would very well know the average bandwidth utilization of their critical server. A web server hosted on a network is often a target for attackers especially when there is heavy traffic from various offenders, the bandwidth utilization of web server will surpass acceptable threshold levels. The Administrator needs an alert when this anomaly occurs on the network. This is where NetFlow Analyzer Alerting mechanism comes in handy.

In the earlier versions, the IP grouping feature of NetFlow Analyzer was used in which t

Alert Profile in NetFlow Analyzer


How to identify a network link that is down or abnormality? Simple! An alert in your Bandwidth Monitor’s UI or an instant email to tell you that your network link needs immediate help from you, the network administrator. The alert mechanism is almost one of the top priority feature that is looked for while deciding on a bandwidth monitor.

NetFlow Analyzer is called as a complete bandwidth monitor tool for it can monitor traffic, analyze , generate report and also alert you in case of any abnormality in your network traffic. In this blog we will discuss about the alert features that NetFlow Analyzer as a bandwidth monitor tool has to offer.

NetFlow Analyzer allows you to configure alerts and set threshold va…

Sampling and NetFlow Analyzer


NetFlow or sFlow technology involves checking the packets traversing a router interface to identify the actual traffic. The high volume of packets and packet rates of traffic on some router links causes the router to use higher CPU and memory during such an analysis. Sampling is solution to be used when flow analytics has to be done on a device. Sampling defines that instead of every packet, 1 out of N packets (where N is the sampling rate) is captured and sent to the NetFlow Analyzer for traffic analytics. Based on the information in 1 packet, the traffic pattern for the rest of the packets is constructed.

Various devices are capable of exporting sample based flows like sFlow (from INMON and available in a wide ran

IP Group and Billing Report in NetFlow Analyzer


Managing, Controlling and Measuring the bandwidth is a huge task to anyone administrating corporate networks. Measuring the bandwidth used is a priority before managing it. NetFlow Analyzer helps you measure bandwidth usage for your enterprise with which you can crosscheck your bandwidth usage as given by your service provider. The IP grouping, interface grouping helps in creation of virtual departments for ease of bandwidth monitoring and accounting.

This blog we have come with very different scenario of IP group, which is about IP accounting and Billing or Charge back.


Consider a Corporate services network which has lot of projects hosted and group of people are working in each project. Th

Voice Traffic Analysis using NetFlow Analyzer


A large number of businesses are migrating to VoIP technology because of its low cost resulting in cost reduction of up to 80%. But, the greatest concern for a business using VoIP is ensuring uptime and quality. Jitter, latency and packet loss cause a drop in the quality of the voice communication which brings us to the requirement of monitoring VoIP to maintain the quality of the voice communications.

NetFlow Analyzer has a VoIP monitoring module to help check the capability of a link to carry Voice traffic and about this, we have discussed in this blog. This topic is about IP Groups which will help monitor the bandwidth used by VoIP traffic.

The scenario is a network with three sites, A, B and C, where each site is co