Using Docker Containers as Mininet Hosts

Introduction
Talentica believes in continuous learning and innovation. We the Talenticans have always been encouraged to undertake learning and experimenting with emerging technologies. With the same objective, we have setup an internal R&D group working on upcoming areas. Software defined networking (SDN) is one the areas where we are developing proficiency.
         As a part of SDN group, we are working on a measuring Hadoop Map Reduce shuffle phase network transfer and also possible traffic engineering solutions for optimizing shuffle phase network transfer. While working on the same, we encountered several challenges, this blog is highlighting solution to one the challenges we faced. Continue reading

SDN Captive Portal

Introduction
Captive portal is a networking solution which performs authentication of the users before granting them network access. It secures the network from unwanted and unauthorized access by providing a landing web page where all the browser’s requests from an unauthenticated user are redirected and authentication is performed. Traditionally a captive portal solution is implemented on the networking device itself by enabling the device to redirect the browser’s requests from unauthenticated users. In a SDN environment we can separate the logic from the device to a centralized controller platform and write our own applications for networking solutions. In this post we explain a captive portal solution for Software Defined Networking (SDN) infrastructure. Continue reading

OpenDaylight with Mininet

OpenDaylight(ODL) is an open source Software Defined Networking (SDN) controller platform which provides a number of ready-to-install features for networking solutions. It also provides a platform to develop our own features. Mininet is an open source network emulator which runs a collection of end hosts and network devices which are created using software to make a single system look like a real network.  This blog post describes step by step instructions to use ODL controller with mininet. Continue reading

Packet Interception Application: Elephant flow detection in SDN

Before proceeding to this use case, it would be better if the reader is acquainted with some basic SDN concepts.

Modern data center networks rely on multi-rooted topologies that offer many alternative data paths between any pair of hosts. As an example, a fattree topology is shown below.

fattree-topology

Fattree topology with 4 core switches Continue reading