Read the Latest News From IWL.

More on SDN Complexity and Reality

Posted by Karl Auerbach /

Definition: SDN: Software Defined Networks

“SDN Complexity and Reality” by Russ White and Shawn Zandi, was published on page 31 of The Internet Protocol Journal, November 2016 (Volume 19, Number 3). You can download ipj19-3.pdf at

In the article, White and Zandi, examine the original three crucial elements to the SDN story:

First, SDNs were supposed to remove the intelligence from the distributed control planes and consolidate that intelligence in a centralized controller.

Second, SDNs were supposed to provide a more granular level of control – down to the flow level.

Third, SDNs would enable the network to be programmable…


Testing the SNMP Agent

IWL provides the SilverCreek SNMP Test Suite, Libraries and APIs for engineers to find and fix bugs in their SNMP agent implementations.

Testing the SNMP Management Application

Often developers and quality assurance engineers will need to test the SNMP management appli...


The Internet Is an Imperfect and Hostile Place

The world is an imperfect place. The internet is no exception. The internet has its good days and it has its bad days. Or to be more precise, the internet has its good seconds and its bad seconds.

Blemishes in internet performance arise from many sources.


Waveforms in KMAX

Posted by Karl Auerbach /

Real network conditions are rarely static. Real life networks suffer transient conditions – congestion builds up and dissipates, tree branches wave in the wind across radio links, long distance routing paths change, VoIP call trunks are filled with more calls during working hours than during the evening. Even something as small as a person standing near a wi-fi access point can change the carrying capacity of a network.

KMAX and our Maxwell Pro can emulate these kinds of changes.


Stack Overflow is Not a Crutch

Posted by Scott Firestone /

The Deal

You’re better off going straight to

That’s the current situation with many technologies, platforms, SDK libraries and command-line interfaces: the documentation is so badly written, or so poorly organized, or so skimpy, that you can safely skip it and just use Stack Overflow as your answer-it-all search engine.

Or, to put it another way, most SDK documentation has a low cache hit rate, which I call a measure of documentation efficiency. If the efficiency is less than about 50%, then you’re better off skipping the docs entirely, and fetching the answer directly from the collective main memory of SO.

And you may have noticed that SDK documentation falls into one of two extremes. Here’s my experience:


ESP8266/NodeMCU TCP Test Reveals Issues

Posted by Karl Auerbach /

The ESP8266 is very popular among the maker set as a platform for experimentation in the realm of Internet of Things (IoT).

We have been playing around with the ESP8622 micro-controller running NodeMCU. We’ve been loading simple LUA programs onto the ESP8266 to get familiar with its capabilities.

Now that we’re reasonably familiar with its capabilities, it’s time we put ESP8266/NodeMCU to test.


Cloud computing has taken hold of the business world, nearly reaching its saturation point according to multiple industry reports. The business cloud and its cloud testing capabilities are growing at an extremely fast pace due to scalability, adaptability, cost-effectiveness, and efficiency across nearly every industry.


When evaluating your application for deployment, it is critical to know exactly how it will respond to a variety of network conditions. In some cases, this means going out into the field in search of live, real-world testing scenarios that can be used to test app functionality and user-friendliness.


5 Best Practices to Avoid Data Center Relocation Disaster

Posted by Judy Jones /

Many CEOs and business owners think data center relocation involves the simple process of unplugging of a few servers, some careful packaging, and a secure shipment to the next location. IT professionals know that it’s actually a lot more complicated than that.


IDC reports that up to 50% of cloud customers have brought workloads back in house, due to network latency and performance issues, in the cloud. This is an expensive, cumbersome, and counterproductive measure that halts the progress of a company’s technology and growth.

In this article, Wayne Wil...


Test Your Mobile App’s Performance

Posted by Judy Jones /

Test Under Different Network Conditions Without Ever Leaving Your Office

There’s no question about it—any business that wants to stay relevant these days needs to have a mobile app to keep communication flowing between their clients and their organization. According to a recent Gallup Poll, 52% of the population check their smartphones multiple times per hour and another 20% checks at least once per hour—making the average mobile device a marketing hotspot for businesses.