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Category Archives for "Networking"

Worth Reading: Erasing Tech Debt

I worked on projects based on the following premise: “We’re going to switch to a different technology and everything will get discarded. For now, as long as it works, don’t worry too much about coding standards.” If it doesn’t sound too bad for you, let’s look at it from a different angle: “We’re all going to die at some point, so while you’re alive, do whatever you want and don’t worry about the consequences.” —Gabriel Colombo @ Free Code Camp

The post Worth Reading: Erasing Tech Debt appeared first on rule 11 reader.

IDG Contributor Network: Is the end of net neutrality a threat to IoT development?

The rapid spread of the internet of things quickly revolutionized how companies operated and how consumers interacted with their favorite apps and devices. Today, cars, homes, and even thermostats are all digitally connected, sharing information with one another and making consumer’s lives easier than ever before. But is this stunning phenomenon now in danger?The Federal Communications Commission has put forward a proposal under the guise of “internet freedom” that could very well spell out the end of the internet of things. The gutting of net neutrality rules could pave the way towards an unregulated future, in which the fate of the internet rest in the hands of massive corporations.To read this article in full or to leave a comment, please click here

What is containerd ?

containerd

We have done a few talks in the past on different features of containerd, how it was designed, and some of the problems that we have fixed along the way.  Containerd is used by Docker, Kubernetes CRI, and a few other projects but this is a post for people who may not know what containerd actually does within these platforms.  I would like to do more posts on the featureset and design of containerd in the future but for now, we will start with the basics.

I think the container ecosystem can be confusing at times. Especially with the terminology that we use. Whats this? A runtime. And this? A runtime…  containerd as the name implies, not contain nerd as some would like to troll me with, is a container daemon.  It was originally built as an integration point for OCI runtimes like runc but over the past six months it has added a lot of functionality to bring it up to par with the needs of modern container platforms like Docker and Kubernetes.

containerd

Since there is no such thing as Linux containers in the kernelspace, containers are various kernel features tied together, when you are building a large Continue reading

The OSPF Two Part Metric

Looking at the capabilities of any given protocol running in our networks today, it certainly seems there are few use cases left the protocol cannot support. In fact, modern interior gateway protocols have become so capable that it almost seems like we only need one to support everything. This is not reality, of course—there are many places where a specialized protocol would do better than a general purpose one, and there are still many use cases current protocols cannot support. One such use case, for OSPF, illustrated below, uses a two part metric to solve a very specific problem, as illustrated below.

On the left side of this diagram you can see the “typical” broadcast network. Originally common in what used to be called local area networks, these sorts of broadcast segments are actually more common on metro edges and wireless networks today than in a campus or data center. Anyone familiar with OSPF should already know what the problem is with this sort of configuration—if you build an adjacency between every pair of routers illustrated here, you end up with just too much state. For instance—

  • Each pair of routers in the network will form an adjacency, and hence Continue reading

Worth Reading: AMD Thread Ripper

The AMD Ryzen Threadripper processor offers higher core and thread counts, which equates to more capability and performance than any other consumer-level processor for high-end computing functionality. By doubling the core count found in the Ryzen chip that launched late in the first quarter, AMD can address different markets that requires higher levels of performance, including video editing, rendering, software development and others. AMD even paints this chip as being able to handle “mega-tasking,” the ability to run two complex workloads (video transcoding and gaming, for example) without the same kind of performance drop you would find on other processors. —Ryan Shrout @ Market Watch

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IDG Contributor Network: I see dead zones

Dead zones have plagued users since the dawn of wireless networks.I know my wife is making or answering a call when she runs for the kitchen window. Sometimes I even find her outside, pointing her smartphone at the sky as she desperately searches for a cellular signal.We’ve all been there. And the struggle to find a strong connection now goes beyond cellular to Wi-Fi and the Internet of Things (IoT). But why?One answer is standards – or lack thereof. Until recently, there were no guidelines for integrating wireless networks directly into homes. Thick walls, frame and cement block many wireless signals. Most architects and builders don’t design around radio frequency (RF), and few people position their Wi-Fi router where they’re spending most of their connected time.To read this article in full or to leave a comment, please click here

Guest Wi-Fi access should always be ‘easy, peasy’

My kids use the expression “easy, peasy” to describes something that is super simple. For example, I might ask my youngest child, “How was your math test?” And because high school math is beyond simple, he would respond, “Easy, peasy.” In life, there are things that should be easy, but we often overcomplicate them. One thing that should be easy every time is signing on to guest Wi-Fi. The fact that it isn’t, makes it one of my biggest pet peeves.+ Also on Network World: 9 free Wi-Fi stumbling and surveying tools + Before I get into the why, I’ll take a step back and define guest Wi-Fi. Webopedia describes it as “a wireless router feature that is designed to allow users to easily grant visitor access to your wireless Internet connection.” Not to nitpick, but it’s more a Wi-Fi feature than a router feature, but most readers of this will get that. Also, note the word EASY in the definition, so all you Wi-Fi administrators out there, take note. To read this article in full or to leave a comment, please click here

Guest Wi-Fi access should always be ‘easy, peasy’

My kids use the expression “easy, peasy” to describes something that is super simple. For example, I might ask my youngest child, “How was your math test?” And because high school math is beyond simple, he would respond, “Easy, peasy.” In life, there are things that should be easy, but we often overcomplicate them. One thing that should be easy every time is signing on to guest Wi-Fi. The fact that it isn’t, makes it one of my biggest pet peeves.+ Also on Network World: 9 free Wi-Fi stumbling and surveying tools + Before I get into the why, I’ll take a step back and define guest Wi-Fi. Webopedia describes it as “a wireless router feature that is designed to allow users to easily grant visitor access to your wireless Internet connection.” Not to nitpick, but it’s more a Wi-Fi feature than a router feature, but most readers of this will get that. Also, note the word EASY in the definition, so all you Wi-Fi administrators out there, take note. To read this article in full or to leave a comment, please click here

Guest Wi-Fi access should always be ‘easy, peasy’

My kids use the expression “easy, peasy” to describes something that is super simple. For example, I might ask my youngest child, “How was your math test?” And because high school math is beyond simple, he would respond, “Easy, peasy.” In life, there are things that should be easy, but we often overcomplicate them. One thing that should be easy every time is signing on to guest Wi-Fi. The fact that it isn’t, makes it one of my biggest pet peeves.+ Also on Network World: 9 free Wi-Fi stumbling and surveying tools + Before I get into the why, I’ll take a step back and define guest Wi-Fi. Webopedia describes it as “a wireless router feature that is designed to allow users to easily grant visitor access to your wireless Internet connection.” Not to nitpick, but it’s more a Wi-Fi feature than a router feature, but most readers of this will get that. Also, note the word EASY in the definition, so all you Wi-Fi administrators out there, take note. To read this article in full or to leave a comment, please click here

Better spelling with GNU’s aspell

GNU's aspell is a very useful tool for fixing potential typos in files. It not only picks out your misspellings and displays them to you; it offers you a list of potential corrections and applies your changes as instructed. And it often remembers the fixes that you've applied.Hopefully, you’ve spotted the typo in this post’s image. If you had a file containing the word “appertizers”, this clever utility would help you to spot and replace it.Say you had a file named "oops" that contained this typo: $ cat oops Please list the appertizers in alphabeticle order. If you asked aspell to check this file with the command “apsell check oops”, it would present the file contents with the word “appertizer” highlighted and offer the list below as options for correcting the error.To read this article in full or to leave a comment, please click here

How to use GNU’s aspell to fix spelling errors in files

GNU's aspell is a very useful tool for fixing potential typos in files. It not only picks out your misspellings and displays them to you, but it offers you a list of potential corrections and applies your changes as instructed. And it often remembers the fixes that you've applied.Hopefully, you’ve spotted the typo in this post’s image. If you had a file containing the word “appertizers,” this clever utility would help you to spot and replace it.Say you had a file named "oops" that contained this typo:$ cat oops Please list the appertizers in alphabeticle order. If you asked aspell to check this file with the command “apsell check oops”, it would present the file contents with the word “appertizer” highlighted and offer the list below as options for correcting the error.To read this article in full or to leave a comment, please click here

NDSS Highlights the Best in Internet Security Research

The nonstop news about Internet security vulnerabilities and incidents could lead one to despair for the future of the Internet. However, what often does not make the news is all the quality research that contributes ultimately to a more secure, private, and trustworthy Internet. Quality academic research that is open and easily accessible is one of our best long-term investments in a truly open and trustable Internet.

Karen O'Donoghue

What is KISS Principle ? Keep it Simple and Stupid ?

What is KISS Principle ? Okay it stands for Keep it Simple and Stupid but what does really it mean in networking ? Can we really make things simpler ?. Probably yes but should we ?   Let’s remember What Einstein said about simplicity.   ” Everything should be made as simple as possible, but no […]

The post What is KISS Principle ? Keep it Simple and Stupid ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

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