Wireless networks are widely used in areas such as business centres, airports, university campuses or even in many city areas. For this scenarios there are solutions for coordinating Wi-Fi access points, usually known as Enterprise Wi-Fi. Although commercial solutions exist, these are proprietary, closed and costly, which in most of the cases make them infeasible for many organizations.

La terminología y arquitectura de capas para los sistemas SDN ha sido definida por el Software-Defined Networking Research Group (SDNRG) del Internet Research Task Force (IRTF) en [1]. Aunque no tiene como objetivo estandarizar ninguna capa o interfaz, proporciona una referencia de los enfoques que se pueden seguir al definir arquitecturas SDN. La Open Networking Foundation (ONF) propuso una arquitectura diferente en [2], que está más orientada a servicios, mientras que la propuesta por el IRTF tiene una visión más funcional [3]. La Figura 1 describe la arquitectura propuesta por el IRTF que consta de: Application Plane: en ésta capa…

The initial setup consists of a remote server running KVM in which three virtual machines were installed using Ubuntu 16.04. Each virtual machine has one network interface bridged to a physical network interface on the remote server, so that each VM is using a different interface of the server and IP addresses were assigned accordingly. At the end of this tutorial, you will have a kubernetes cluster that consist of one Kubernetes master and two Kubernetes nodes.

The authentication protocol Kerberos allows a number of computers to prove their identity among them safely over an insecure network. The operation of the protocol is based on the Needham-Schroeder protocol, which defines a ''trusted third party'' called Key Distribution Center (KDC). William Stallings in his book Fundamentals of Network Security: Applications and Standards, Second Edition (p.394) defines a KDC as follows: Authorized system to transmit temporary session key for users. Each session key is transmitted encrypted using a master key that the Key Distribution Center shares with the target user. The KDC can be seen as a set of…

What is sed? Sed is a stream editor which is used to perform basic text transformations on an input stream (a file or input from a pipeline) or filter strings. It permits to modify the contents of different lines in a file, based on some parameters. For the examples shown in this article, you used the 4.2.1 version of sed as shown below: sed --version GNU sed version 4.2.1 Copyright (C) 2009 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,…