Network Design Principles: Cost-benefit

A design can be evaluated using the cost-benefit principle. A design is good if the benefits outweigh the cost. From a designer perspective, a cost-benefit analysis can assess the financial returns associated with adding a design feature. The designer should also evaluate benefits and costs from the user’s perspective so… Read more »

Network Design Principles: Consistency

The consistency principle states that systems are more usable and learnable when similar parts are expressed in similar ways [Lidwell 2010]. Consistency can be in appearance (e.g. network documentation) or in function (e.g. device configuration). Internal consistency refers to consistency with other components in the system (e.g. DHCP allocates the… Read more »

Network Design Principles

      No Comments on Network Design Principles

Design principles are widely applicable laws, guidelines, biases and considerations that designers use to guide their decision-making process. Engineers use some of these principles to design products that meet the users’ requirements. In a series of posts, I describe briefly one design principle that is applicable to the design of… Read more »

Short Tutorial on Z-Wave

      Comments Off on Short Tutorial on Z-Wave

Z-Wave is a wireless communications protocol that uses low-energy radio signals operating in the ISM band and support mesh networking topology. Z-Wave is used primarily for home automation for wireless control of home appliances e.g. lighting, security systems, thermostats, garage door openers etc. Z-wave protocol is developed by Sigma Designs,… Read more »

Building an OpenFlow Switch with Integrated Controller and IDS/IPS

      Comments Off on Building an OpenFlow Switch with Integrated Controller and IDS/IPS

This post describes steps to build an OpenFlow switch using Open vSwitch on a server running Ubuntu 18.0.4. The server runs a Ryu controller and Snort intrusion prevention system, both are open source software. Such a system could be used a security appliance in a network of low-to-medium bandwidth requirements.

Building an OpenFlow Lab

      Comments Off on Building an OpenFlow Lab

Like many people, I have started learning about Software-Defined Networking and OpenFlow using Mininet, which is a great virtual environment to use. However, Mininet has some limitations, and I found myself looking for hardware alternatives. This article describes how to build an OpenFlow lab environment that can be used for… Read more »

FlowManager – An SDN Application

      Comments Off on FlowManager – An SDN Application

The FlowManager is a RYU controller application that gives the user manual control over the flow tables in an OpenFlow network. The user can create, modify, or delete flows directly from the application. The user can also monitor the OpenFlow switches and view statistics. The FlowManager is ideal for learning… Read more »

How to create Linux containers

      Comments Off on How to create Linux containers

Linux containers isolate applications from the host system that they run on and from other containers. Containers behave much like virtual machines, but unlike virtual machines, containers include only the software components they need to operate rather than an entire operating system. This improves performance and reduces the size of… Read more »