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.

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.

Android local networking using NSD

In this post we will see how data can be transferred between two android devices in the same network. What follows is a bit of theory and implementation in android studio. There is a source code link at the bottom of the page for reference.

WiFi direct – android local networking

In my earlier blog post I discussed data sharing between two android devices in same network using NSD. In this post we will see communication between two non-connected android devices (can be connected to same or other network, doesn’t really matter) via WiFi direct. Devices should be in WiFi range. I will start with a bit of theory about WiFi direct and then we will see how it is implementable using android APIs (Sample app source code git link at the end of post).

Android WiFi direct service discovery

I suggest reading my previous posts on NSD and WiFi Direct before reading this one. This post requires some of things discussed in these two posts. If you are already aware of WiFi direct service discovery, you  can directly check out my sample code on git.