To install the Mininet SDN network simulator on a remote server running on Amazon’s EC2 cloud1, follow the procedure shown below. After installing it, I did some basic tests and it seems that Mininet works well on the Amazon EC2 server.
From my laptop PC, I connect to the Amazon EC2 instance via SSH. In the example below, the server’s private key file AWS-PrivateKey.pem is stored in the folder ~/AWS and the server’s public IP address is 55.155.1.55. I had previously created a new user brian on the server.
brian@Laptop:~$ ssh -X -i ~/AWS/AWS-PrivateKey.pem [email protected]
To install the latest stable version of Mininet, plus all supporting software, execute the following commands on the Amazon EC2 server running Ubuntu Server 14.04.
brian@AWS:~$ sudo apt-get install git
brian@AWS:~$ git clone git://github.com/mininet/mininet
brian@AWS:~$ mininet/util/install.sh -a
To test the installation, run the following command:
brian@AWS:~$ sudo mn --test pingall
The benefit of installing Mininet on a remote server such as an Amazon EC2 instance is that I can now experiment with Mininet from any computer, including a tablet or smartphone, at any time as long as I have a connection Continue reading
When I started studying in earnest for my CCIE, I started a log of how I was spending my time studying, which books and papers I'd read, videos I'd watched, and so on. I thought it would be a neat exercise to look back afterwards at what it took to achieve this goal. I'm also somewhat self-deprecating and tend to minimize my accomplishments, so having this data is a way for me to remember that this wasn't a small accomplishment at all.
IPv6 adoption has been slow. But I think it’s reaching a tipping point. I’m very close to calling 2015 “The year of IPv6.” There’s plenty of people who won’t believe me, but the statistics are very interesting. You need to keep a close on eye on what the data is saying.
Recently I asked the question “What percentage of Internet traffic needs to be IPv6 for you to consider IPv6 to be mainstream/arrived/the year of IPv6?”
@bobbobob had the best answer for when IPv6 can be considered ‘mainstream’:
@northlandboy When I see criminal minds, or law and order using a poorly faked IPV6 address when they're 'hacking', I'll say it's arrived.
— Rabbit Sultan (@bobbobob) February 21, 2015
But @icemarkom was probably technically correct with this answer:
@northlandboy More than 50%.
— Marko Milivojevic (@icemarkom) February 20, 2015
So how far away is that? It’s tough trying to measure IPv6 adoption. Traffic patterns are region- & user-specific. The services that Chinese users access are different to those that a New Zealand business users. Traffic is often concentrated with a few ISPs and/or a few big services (Google, Facebook, Twitter, etc).
I like to use the Google IPv6 statistics Continue reading
Introduction
Open Shortest Path First (OSPF) is a link state protocol that has been around for a long time. It is geneally well understood, but design considerations often focus on the maximum number of routers in an area. What other design considerations are important for OSPF? What can we do to build a scalable network with OSPF as the Interior Gateway Protocol (IGP)?
Prefix Suppression
The main goal of any IGP is to be stable, converge quickly and to provide loop free connectivity. OSPF is a link state protocol and all routers within an area maintain an identical Link State Data Base (LSDB). How the LSDB is built it out of scope for this post but one relevant factor is that OSPF by default advertises stub links for all the OSPF enabled interfaces. This means that every router running OSPF installs these transit links into the routing table. In most networks these routes are not needed, only connectivity between loopbacks is needed because peering is setup between the loopbacks. What is the drawback of this default behavior?
To change this behavior, there is a feature called prefix suppression. When Continue reading
You may have noticed that we’ve been spending some time out west demonstrating our big data fabrics and sharing our vision for the third era of networking. You’ll be seeing more meet-ups and live demonstrations in the near future, so keep an eye on the blog and on Twitter to see where we are headed next. In the meantime, can you name the 5 main characteristics of a third era network? Hint: the answer is somewhere on the Plexxi website. Tweet us your answers for the chance to win some Plexxi swag. We can’t wait to hear from you!
Below please find a few of our top picks for our favorite news articles of the week. Enjoy!
InformationWeek: 8 Ways IoT Will Change IT Forever
By Andrew Froehlich
There has been a great deal of discussion lately surrounding the concept of how the Internet of Things (IoT) will change everything. But very little of it really dives into the nuts and bolts of how IoT could dramatically change the roles and opportunities for those of us who work within IT. Here are eight ways we think IT will change in an IoT world. We’re focusing on areas of IT that Continue reading