Excentis staff members regularly write on technical and less technical topics in our different business areas. We hope you will find some useful gems of information here. If you have any suggestions we love to hear from you on blog@excentis.com.

Happy reading!

Rigorously testing a network device or distributed service requires complex, realistic network test environments. Linux Traffic Control (tc) with Network Emulation (netem) provides the building blocks to create an impairment node that simulates such networks. This final post of a three-part series shows how to set up an impairment node in practice.
Traditionally, when a home user sets up a home network, a lot of manual configuration is needed. While the IPv6 configuration can be done in an automated way by using Prefix Delegation, the IPv4 setup requires manual configuration of subnets and routes within the network. The mechanism of Link-ID describes a way to derive IPv4 subnets from the IPv6 subnet, so manual configuration of the first is no longer needed.
Tags: 
Today, Network Address Translators (or NAT) devices are everywhere. Their rapid rise towards universal adoption was not part of a planned effort. Instead, it was fueled by the continued growth of the internet and the corresponding depletion of the IPv4 address space. Besides obvious advantages, such as IP address reuse and hiding of internal network topologies, NAT technology has some important drawbacks as well. This blog post takes a closer look at these downsides.
Tags: 
Measuring throughput using TCP seems an easy task: just send data over a TCP session and the protocol will automatically seek the maximum network capacity for you. If you're in luck this will give you satisfying results, but what if it doesn't? Exactly which parameters should you play with to optimize your performance? Let's find out!
Tags: 
With smartphones, tablets, laptops and smart TVs ruling the world, sharing and streaming content from one device to another over Wi-Fi becomes more and more important. The list of new protocols to achieve this goal is still booming. Companies are trying to convince the customer with promising terminology like Apple® AirPlay®/AirDrop®, Samsung AllShare™, Intel® WiDi, Sony® One-touch Mirroring™ and so on. But how do these protocols work; how do they relate to Wi-Fi CERTIFIED™ standards like Wi-Fi Direct®, (T)DLS® and Miracast®; and most important: what about interoperability? Let’s find out!
Tags: 
While working with DOCSIS systems it is important to understand the upstream periodic ranging process. Ranging can be seen as the DOCSIS heartbeat between Cable Modem (CM) and Cable Modem Termination System (CMTS). As many people tend to struggle with the details of this process, the goal of this article is to visualize the periodic ranging process. Lets take a closer look at that ranging process – and let’s try to understand where things can go wrong during this DOCSIS heartbeat.

Pages