Data Storage: The Foundation & potential Achilles Heel of Cloud Computing
In almost anything that you read about Cloud Computing, the statement that it is ‘nothing new’ is usually made at some point. The statement then goes on to qualify Cloud Computing as a cumulative epiphenomenon that more so serves as a single label to a multi-faceted substrate of component technologies than it does to a single new technology paradigm. All of them used together comprise the constitution of what could be defined as a cloud. As the previous statement makes apparent the definition is somewhat nebulous. Additionally, I could provide a long list of the component technologies within the substrate that could ‘potentially’ be involved. Instead, I will filter out the majority and focus on a subset of technologies that could be considered ‘key’ components to making cloud services work.
If we were to try to identify the most important component out of this substrate, most would agree that it is something known as virtualization. In the cloud, virtualization occurs at several levels. It can range from ‘what does what’ (server & application virtualization) to ‘what goes where’ (data storage virtualization) to ‘who is where’ (mobility and virtual networking). When viewed as such, one could even come to the conclusion Continue reading
dynamips files for the demo lab
The free demo lab, which can be downloaded here, is a huge success. Many ask me to send them the dynamips version of the initial configurations and .net file. Since dynamips do not support switches, please skip the L2 tickets, which is ticket #1 on the demo lab.Ticket #02
Please follow the instructions found here about how to use the lab file. ...While R3 can ping R1's Lo0 IP address, R4 can't do so. ...For the solution Click hereDemo lab is ready!
I am so happy to see that finally, the demo lab is released. ...Please contact me, [email protected], for initial configurations for dynamips and other topologies. Tomorrow I’ll publish a new Ticket, here on this blog.Ticket #01
Please follow the instructions found here about how to use the lab file. ...R1 can’t ping R3’s Lo0 IP address. ...For the solution Click hereWelcome
Welcome to my blog. I’ll publish here troubleshooting mini-labs with detailed walkthroughs, and few other posts... Hope you will enjoy themThe Silicon Choice for Cloud Networking
These days there is much discussion whether switches or routers should be built with proprietary custom ASICs or standard “merchant silicon” chips. At one level, the question is “Why does it matter?” After all, networking vendors have been building custom silicon chips since the invention of the LAN switch in the early ’90s.
In my own career, I have led the development of several generations of very high volume network switch silicon. However, even I could not design better silicon switch chips than what is available now on the merchant market. To me this is an inflection point for the industry that is not unlike what happened in the computer industry with the adoption of industry standard architectures.
While CPU and switch silicon architectures differ in many ways, the underlying economics are very similar. In the 1980s and 1990s, CPU architectures flourished: there were MIPS, PowerPC, SPARC, ARM, and X86. Each architecture staked out their position in the market. The RISC architectures led the server market with 64-bit addressing and multi-processing capability, and also focussed on embedded applications. X86 was the standard for desktop computers. However as the years passed, most of the volume growth in the market has Continue reading
Ubuntu Idyll Cisco Study Environment
I have written a few posts in which I mentioned the amazing GNS3/Dynamips/Dynagen set of tools that enable you emulate a Cisco network …. also a great too used to prepare for the Cisco CCIE lab exam [Professor of Internetworking] … Continue reading
Moving to ZFS
My file server is full and I have no options for expanding it. The server is a white box system running FreeBSD with a hardware RAID card and 400GB of RAID-5 storage. The hardware is old, the hard drives are old and I can't expand it. It's time for something new.
OpenBSD Compact Flash Firewall
The goals of this project was to build a low-power, small form factor machine that runs OpenBSD and acts as a firewall/router in a home network or small business setting. This page walks through the hardware I chose and the process I use to get OpenBSD running on the CF card. Table of Contents Hardware Operating System System Operation Hardware The design has gone through two generations of hardware now.OpenBSD IPsec Tunnel Guide
This guide will explain how to setup a site-to-site IPsec tunnel (i.e., tunnel mode IPsec) between two OpenBSD gateways. Throughout this document there are example configs shown, some of which contain secret key data. DO NOT use these example keys! Create your own (as shown) and keep them private. Table of Contents Introduction The Tools Terminology Building a Site-to-Site Tunnel Starting isakmpd Allowing IPsec Traffic Through pf(4) Filtering Traffic on the Tunnel Adding Redundancy Troubleshooting The Tools OpenBSD ships with all the tools needed to begin using IPsec.Installing Olive 7.1
Olive refers to a regular PC that's running Juniper Networks’ JUNOS software. Juniper developed Olive early on so they could perform testing of JUNOS during development. These days Olive is deprecated in favor of cheap, low-end M and J-series routers.