In my previous role we were migration several hundred frame circuits to an MPLS network. Once the circuit was provisioned from the provider we would peform our own stress test and turn up before moving in any users. This would include testing of through-put, load, stability, etc. Customizing Your Stress Test Command If you’re trying to figure out which is the fastest hard drive for a certain workload, you should create a command that best matches that workload. For example, if it’s a server that only reads data and doesn’t write, you should perform a test of 100% reads that doesn’t measure any write performance.

What is network stress testing?

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Network stress testing is the practice of putting your network under a heavy load to discover breaking points and areas for improvement.

By using network testing tools, you can determine the limits of your hardware, and help get an understanding of how much traffic you can take on before you need to expand your resources.

Here is our list of the best network stress testing tools for 2020:

SolarWinds WAN Killer Traffic Generator(FREE TRIAL) – An easy to use and feature-rich toolkit ideal for stress testing the networks of medium to large-sized businesses.
Nping – Free open-source command-line tool for packet crafting and network testing.
Packet Sender – Free network stress tester with a graphical interface.
Ostinato – Provides API integrations, support, and reporting.
NetScanTools Pro – A bundle of tools that includes a Packet Generator and Packet Flooder to perform stress tests.

Why is network stress testing important?

Network stress testing is important when planning network expansions, as well as when looking to upgrade equipment such as switches and firewalls.

Knowing exactly what your network can and cannot handle will keep you prepared for growth, and help avoid any outages based on hardware limitations. In addition to growth, there are a few other reasons why a business or sysadmin would want to stress test their network.

If you’re an MSP, or service provider that guarantees a certain SLA, you’re going to want to ensure that your network can not only keep your business running but keep your client’s services running as well. Network stress testing can help find unconventional ways end-users could accidentally overload the network and cause service outages that directly impact productivity.

Stress tests can also help identify weaknesses that an attacker could use to overwhelm your infrastructure. DDOS attacks have evolved in complexity over the years, so testing the limits of your network both internally and externally can give you an idea of what it would take to bring down your network.

On the flip side, not all floods of traffic are malicious. In the age of viral content, a successful marketing campaign could drive massive amounts of traffic to a website or service. Not having a plan for these types of events could lose new customers or bring down services that existing customers use in the process.

What causes network stress for businesses?

Network stress can be caused by several factors and can be divided into two segments: internal and external.

Internally on the LAN, most causes of network stress are found to be caused by unregulated traffic taking up too much bandwidth. A great example of this that you may have experienced yourself is when multiple people are streaming Netflix or Hulu and everything grinds to a halt. This can also happen if too many people are moving large files across the intranet or parts of your LAN.

From externally on the WAN, malicious traffic can attempt to overload services that may impact outward-facing products your customers use such as websites and online tools. Attacks could be thwarted with a simple CAPTCHA, but sometimes it’s not that simple. Attackers can create malformed packets and send them to your exposed ports at incredible volumes. Being able to not just stop, but withstand this type of attack is critical for any business that relies on the internet.

How do I fix network stress?

So what can be done to regain control of your network? It all starts with the Quality Of Service (QoS). QoS is available in nearly all-business-class firewalls and routers and allows you to set limits on how much resources a specific source of traffic can use.

Say you’d still like to allow employees to listen to music at work, but don’t want the network getting overloaded by music streaming packets. You can set the QoS to limit music streaming services so that it doesn’t interfere with day to day operations. Ideally, it’s a win-win for everyone. QoS allows you to get as granular as you’d like. You can even set rules based on individual ports and set exclusions based on certain IP addresses.

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Of course, all of this would be in vain if you had a legitimate physical bottleneck in your network, like old wiring or a failing switch that brought down your speeds. That’s when running a thorough network stress test can help you map out what parts of your network need improving, and just how much traffic it can take.

How to stress test a network

Stress testing a network can be as simple as sending packets to a machine, or as complex as running an automated tool to report back it’s findings. On a very simple scale running a ping check across your network can give you an idea if a device is dropping packets or experiencing high latency.

For instance, if you know a device is behind a specific firewall or switch, you can ping another device that isn’t behind that switch to help get a better idea of where the bottleneck is coming from. The downside of this is that it’s tedious, and doesn’t provide much insight into what is causing the problem.

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Alternatively, you can move a 1GB file across the LAN to another workstation, VLAN or server, and measure the speed. The file size doesn’t have to be 1GB but should be large enough to take some time. This will give you a rough idea of what the speeds are on your LAN to that destination.

A proper network test would involve a bit more detail. With network stress testing tools you can craft specific packets of any size, and control the exact amount of times a device is sent traffic. This level of customization gives you better flexibility.

Most sysadmins will agree that having a proper network stress testing tool saves tons of time, and is a valuable part of their everyday toolkit.

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The best network stress testing tools

1. SolarWinds WAN Killer Traffic Generator (FREE TRIAL)

WAN Killer Traffic Generator is one of the many tools you can find in the SolarWinds Engineer’s Toolkit. This tool enables you to go beyond basic stress testing by creating specific packets tailored to your specified protocols inside of any Windows environment.

This opens up near-limitless possibilities when it comes to testing how your servers, applications, and overall network will behave under certain conditions. Through the traffic dashboard, you can control the size, protocol, and destination of your traffic before sending it. This allows you to simulate certain applications, or how your end users are likely to behave in a real-lif

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