Memorial Day 2015
For those who do not know, today, in the United States we hold a day of memory — Memorial Day — for those who have fallen in the defense of the freedom of our Nation. This is different from Veteran’s day, a day which honors those who either are or have served in the US Military, in that it is focused on those who have died in the actual service of the United States — in the course of duty, as it is often said. From the original Presidential proclamation —
On this Memorial Day, as we honor the memory of brave men who have borne our colors in war, we pray to God for His mercy. We pray for the wisdom to find a way to end this struggle of nation against nation, of brother against brother. We pray that soon we may begin to build the only true memorial to man’s valor in war–a sane and hopeful environment for the generations to Come.
As a veteran myself (9 years in the USAF), I find this day to be one of sadness and remembrance. My Grandfather died in the service, as have many of my other relatives, and almost Continue reading
vSphere 6 Networking Deep Dive Webinar Is Complete
Last week we finished the last session of vSphere 6 Networking Deep Dive webinar – 6 hours of downloadable videos covering every single vSphere 6 networking topic are waiting for you.
As always, you get access to the webinar with your ipSpace.net subscription, or you can buy just this webinar, or one of the bundles that include it: Data Center track or Data Center Trilogy.
Slideshow: Here’s What You Missed at OpenStack Vancouver
Vancouver can host all the tech shows from now on. We won't mind.
Tutorial for creating first external SDN application for HP SDN VAN controller – Part 3/3: “Node Cutter” SDN application in perl with web interface
For best article visual quality, open Tutorial for creating first external SDN application for HP SDN VAN controller – Part 3/3: “Node Cutter” SDN application in perl with web interface directly at NetworkGeekStuff.
In this tutorial series, I will show you by example, how to build your first external REST API based SDN application for HP SDN VAN controller, with web interface for the user control. Target will be to learn how to use REST API, curl and perl scripting to generate some basic and useful code to view and also manipulate network traffic.
This article is part of “Tutorial for creating first external SDN application for HP SDN VAN controller” series consisting these articles:
- Part 1/3 – LAB creation and REST API introduction
- Part 2/3 – Influencing Flows via cURL commands
- Part 3/3 – “Node Cutter” perl application with web interface
In this Part 3/3, I will show you my first example SDN application that I have written just to demonstrate the combination of REST API interface with perl and the ability to have a web based interface for the user to this interface. Please note that this application is purely demonstrative on the REST API interface and Continue reading
Configure link quality with Open VSwitch in GNS3
This is part of lab series "Configure link quality in GNS3": WANem, a live iso, VM (VirtualBox or VMWare). Open VSwich VM: VirtualBox orConfigure link quality with WANem (live CD) in GNS3
Topology Start a VirtualBox with WANem LiveCD, during OS boot in the console, you are invited to set interfaces parameters (IP,Tutorial for creating first external SDN application for HP SDN VAN controller – Part 2/3: Influencing Flows via cURL commands
For best article visual quality, open Tutorial for creating first external SDN application for HP SDN VAN controller – Part 2/3: Influencing Flows via cURL commands directly at NetworkGeekStuff.
In this tutorial series, I will show you by example, how to build your first external REST API based SDN application for HP SDN VAN controller, with web interface for the user control. Target will be to learn how to use REST API, curl and perl scripting to generate some basic and useful code to view and also manipulate network traffic.
This article is part of “Tutorial for creating first external SDN application for HP SDN VAN controller” series consisting these articles:
- Part 1/3 – LAB creation and REST API introduction
- Part 2/3 – Influencing Flows via cURL commands
- Part 3/3 – “Node Cutter” perl application with web interface
In this Part 2/3, we will discuss how to create a few cURL commands in linux environment, authenticate to the controller REST API interface and generate flows to modify the forwarding path overriding the controller decisions.
Step 1) cURL command line tool to authenticate to the REST API and receive a token
Lets start with the basics, in linux console exists Continue reading
Double Parentheses in Python
Python is one of the easiest programming languages to learn, because of it’s inherent flexibility. (This can be a good thing as well as a bad thing.)
One example of Python’s flexibility is the double parentheses. Take the following snippet for example:
print funcwrapper(3)(2)
Even an inexperienced programmer should be able to make sense of most of this. Reading from left to right, it looks like we want to print the output of a function, and we’re passing an integer - 3 - to that function. However, the second pair of parentheses doesn’t quite make sense.
This notation is different from what we would do if we wanted to pass two arguments to a function; in that case, we’d put them all inside a single pair of parentheses and separate them via commas:
print funcwrapper(3, 2)
So what does the first example using two pairs of parentheses accomplish?
The use of a double parentheses is actually an indicator of one of Python’s coolest features - and that is that functions are themselves, objects! What does this mean?
Let’s work our way up to the snippet above by first defining a very simple function - something that takes an integer Continue reading
Citizens of Tech 004 – Retro Virtual Reality Kittehs
A cat sets a world record. A surgical robot gets hacked. Capsela was a sweet toy. Oculus Rift is going to be available soon. Larsen B is falling into the Antarctic Ocean. Spotify takes on video. All this & more on this week's Citizens of Tech with Eric Sutphen & Ethan Banks.
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