learn by doing

SDN Intro: Basic L2 connectivity by using OVS and POX

You’ve all probably heard about this fancy SDN term that’s been passing around in the networking world in the recent years. I’ll try to explain below what SDN means for me and what are the benefits of using such a model.

Ansible playbook: postfix with Mandrill relay

In this post I will show how you can use Ansible to automatically install postfix mail server and configure it to relay through Mandrill. Mandrill is a transactional email platform that allows you to send up to 12.000 emails for free. I use it for my servers to avoid situations where the IP addresses assigned by my ISP are blacklisted on some RBL lists.

Lab - basic OSPF routing scenario

In this post post we’ll see how we can do a basic routing scenario by using the virtual appliances. Below is the logical diagram of the scenario. Our objective is to esatblish connectivity between the 2 clients: host01 - and host02 -

Virtualized application infrastructure

In this post I’ll show how you can build a secure virtualized infrastructure for a basic webapp. We will break the setup into VMs that provide isolated services. You can find below the infrastructure diagram. The followings steps will show how you can set up a bare-metal server running Debian Wheezy to act as a KVM hypervisor and the process of deploying and configuring the VMs and the services they are running.

JunOS interfaces IP addresses DNS records generator

This post is closely related to the previous one where I showed how you can parse the interfaces IP addresses from a curly bracket JunOS config file. The following script will be used to generate A and PTR records for a BIND zone file. Please note that the script needs to be run within the same directory as the Perl parser script and the config file.