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about me or about this blog and how it is built

Fixing a Thinkpad T420 battery problem on Linux

I upgraded my T420 because Ubuntu Mate 19.10 now supports the Nvidia Optimus drivers and includes a utility that lets me switch between Intel and Nvidia graphics cards. However, the upgrade seemed to break the power management on my laptop. When running on the battery, the laptop would suddenly lose power after only 10 minutes,

Lenovo Thinkpad T420: Another excellent, inexpensive Linux laptop

I recently purchased a used Lenovo Thinkpad T420 laptop to replace the Lenovo Thinkpad T400 I was previously using as my main platform for researching open-source network simulators and emulators. The T420 is a five-year old product but it offers all the ports and performance I need. Because it is well past its depreciation curve,

Blog status report 2014

The occasion of my fiftieth post is a good milestone to pause and look back on the two years since I started blogging about open-source routing and network simulation. I will review the blog’s performance statistics and reflect on why I started this blog and what I want to do next. The chart above shows

Lenovo T400: now an excellent, inexpensive laptop

When I started researching open-source routing and networking software, I ran the open-source Linux operating system on a virtual machine running on my Apple iMac computer. When I wanted to experiment with virtualization technologies such as KVM, which will not work inside a virtual machine, I set up my iMac to dual-boot Linux and Mac

Google Webmaster Tools

Recently, Google temporarily dropped my blog from its search results. Since over 75% of my traffic comes from first-time users who find the site through search results, this effectively caused a two-day “outage” for my site. As I tried to understand why my blog was not findable in Google, I realized that it would have

Simulating IP and MPLS networks on Linux: A Learning Tool

As a personal project, for my own edification, I will research and implement systems that will allow me and anyone who follows this blog to experiment with networking technology and learn new concepts. I will not have to invent anything new. I will use the resources already created by other people who have generously made

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