Each network needs a different solution to the problem of how best to allocate a network’s precious bandwidth.
- The eternal problem: Our network is running slowly.
- The modern solution: Prioritize the traffic.
- Classic method: Set Class-Based Quality of Service (CBQoS).
- See the latest version NTA 4.0
- Bandwidth monitor for the job: SolarWinds Network Traffic Analyzer.
Husbanding Your Network’s Bandwidth
Solarwinds Network Traffic Analyzer (NTA) works by capturing the flow data from network devices such as Juniper J-Flow, Cisco NetFlow v5 or v9. The key feature is the ability of NTA to identify which users, applications, and protocols are consuming the most bandwidth from this stream of NetFlow data packets.
The most enjoyably part of this tool is prioritizing traffic using data obtained by CBQoS (Class-Based Quality of Service); you can set the precedence on the basis of applications; alternatively you can weight the traffic based port numbers, or even prioritize based on users’ IP addresses. NTA gives you charts of which applications are being used by whom and for what purpose. One of this analyzers impressive features is that underneath each over-view is a drill-down into traffic on specific network elements.
One technique is to start with an intelligent guess as to the best priorities for traffic at the routers and switches. More than likely, you will tweak the priorities and repeat the cycle until you get the best trade-off for your network.
After you have spent time adjusting the NTA to suit your network you can sit back confident that you will get instant notification when an interface exceeds its utilization threshold. Since NTA stores the data you can look back and troubleshoot precisely when particular application traffic suddenly increased and caused a bandwidth problem.
How Traffic Analysis Works
The key point is that NTA turns routers into traffic analyzers. Once you think about it you realize that the routers know an awful lot about network traffic, after all, controlling data packets is their day job. Solarwinds’ skill is not only providing the software for us to see the different types of layer 3 traffic, but also the ability to send important traffic through the router quickly at the expense of packets than can wait.
This diagram below of NTA an installation compares polling on Flow analysis with the CBQoS polling. The collection occurs simultaneously with Flow‑enabled devices using port 2055, whereas the CBQoS-enabled routers use port 161.
Using Orion NTA’s Top Talker Feature
Many years ago Pareto discovered the 80:20 rule. 20% of users give 80% of the trouble! In the case of traffic monitoring, the top talkers should give the picture of who is using over 90% of your network bandwidth. In addition to focussing your mind on the main consumers, the top talker feature significantly improves the responsiveness of the reporting pages. Any data lost will be of minor traffic that is unlikely to be the course of a network bottleneck that you may be investigating. You can review this feature in the NetFlow Web Console.
Orion Alerts Integration
NTA automatically adds top talker information to Orion interface utilization alerts. You can navigate directly in to the NTA interface details from messages in the Orion Events resource. For example, High Receive Percent Utilization: alerts you when traffic received by an interface exceeds the bandwidth threshold which you set earlier.
Class-Based Quality of Service was introduced in version 3.9. It monitors network traffic, and then reports on the effect of your prioritizing settings.
The Class-Based Quality of Service triggers an alert when the amount of Pre-Policy traffic meets the conditions of your threshold setting. It also writes to the SolarWinds event log and can email you a report of the network traffic.
This enables you to make a before and after comparison of your settings. Again CBQoS triggers an event log entry and an email report if you wish. See chart to the right.
NTA with CBQoS even reports on data packets dropped as a result of the Post-Policy.
What’s Else is New in NTA Version 3.9
Global Flow Direction Settings.
Also Unknown Traffic Events – Manage unidentified flows
Here is a thriving group of people who are performing network management daily. Tap into their expertise, learn from their experiences; ask your questions and receive an expert answer quickly. Another use of the Thwack forum is for data sheets on how to configure your routers for use with NTA.
What’s New In Network Traffic Analyzer
Here is an interface that makes is quicker to locate specific traffic. With Flow Navigator you can filter on ToS (Type of Service), IP Addresses for a given time period. As a result you can generate views of the data to suit your network and to achieve your goals.
For example, if you want to see all SQL database traffic from your site through a specific service provider, you could select port 1433.
At the bottom of the Flow Navigator screenshot you will see "Save filtered view to menu bar". This avoids having to recreate filters for your common tasks.
A great way to review the Network Traffic Analyzer is to watch this video by Josh Stephens, head geek at SolarWinds.
Hardware Requirements for SolarWinds Network Traffic Analyzer
- CPU 3GHz or faster, dual processors with dual cores
- RAM 3GB or more
- Hard Drive Space
- Orion NTA server: 5GB or more, RAID 0, 1, 0+1, or 1+0.
- SQL Server: 5GB or more, RAID 0, 1, 0+1, or 1+0 on at least 6 spindles.
Naturally, each of these network devices needs to support SNMP.
- Cisco devices exporting NetFlow version 5 or 9.
- Huawei devices exporting NetStream version 5 or 9.
- IPFIX devices exporting IPFIX.
- J-Flow devices exporting J-Flow.
- sFlow devices exporting sFlow version 5.
Summary of Solarwinds Network Traffic Analyzer (NTA)
Run down your network bandwidth hogs with SolarWinds NTA, discover which applications are consuming the bandwidth.
Each network manager seeks a different solution to the problem of how to allocate their network’s bandwidth. With NTA you can turn your routers into traffic analyzers and then prioritize the data packets to ensure your computers are running at maximum efficiency.
More Free and Trial Network Software
Here are Guy’s reviews, recommendations and download links for additional handy utilities. Many of these programs are completely free, while others are fully-functional, but time limited. One common theme is that SolarWinds give you a free specialist tool ideal for testing, and then supply a more comprehensive suite for bigger networks. To let you into a secret, for small networks, the free tool is all you’ll ever need.