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Category Archives for "Networking"

George Sadowsky on the History of Networking

George Sadowsky was a pioneer in recognizing the importance of networking technology for economic development, particularly in developing economies. He has worked in over 50 countries to bring training and networking infrastructure to the local population. In this episode of the History of Networking, George recounts some of the early, pre-Internet, work in computer networking, and the development of many of the organizations that make the Internet work today. His web site can be found here.

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Tools 3. Checking your connectivity bandwidth with Speedtest

Hello my friend,

Continuing our discussion about the network troubleshooting tools we can’t pass by one of the most popular and widely used, which is named SpeedTest. 



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Can automation help with performance troubleshooting?

Doing the collection and initial analysis of the information during the troubleshooting could be quite a time-consuming task. On the other hand, the troubleshooting of the live outages should be as quick as possible to minimise the downtime of the affected services. That’s where the automation can help you.

In our network automation training we explain how to use existing open-source tools and create your own with Ansible, Bash and Python. Leveraging them and all possible interfaces (CLI, NETCONF, RESTCONF, gNMI) we teach you how to effectively build, operate and troubleshoot your network.

Start your automation training today.

Brief description

From the name of the tool, SpeedTest, it is obvious that the main goal is to measure the “speed”. In fact, it measures Continue reading

Nominations Now Open for Public Interest Registry (PIR) Board of Directors

The Public Interest Registry (PIR) is the non-profit operator of the .ORG, .NGO and .ONG domains. PIR has been a champion for a free and open Internet for more than 15 years with a clear mission to be an exemplary domain name registry, provide a trusted digital identity and help educate those who dedicate themselves to improving our world.

If you or someone you know has the interest and qualifications to help guide the future of PIR, the Internet Society invites you to submit a nomination for a seat on the PIR Board of Directors. 

Prior board or senior executive experience is preferred. All directors must have an appreciation for PIR’s Mission and the potential impact of PIR decisions on the customers of PIR and the global community served by .ORG and the other TLDs PIR operates. Directors must be able to read and understand a balance sheet, as well as read and communicate effectively in the English language.

In 2021 there are four positions opening on the PIR Board. The appointed directors will serve staggered terms, with half appointed to two year terms and half to three year terms, with terms beginning mid-year in 2021. 

More information about the position, the qualifications, and a link to the Continue reading

Running IPv6 Only Networks

In today’s episode we’re talking about IPv6. More specifically, we discuss what it takes to run an IPv6 only network. Why now? And why not dual stack? Well, in the middle of November (2019), the US government put out a memo outlining their updated guidelines and expectations for IPv6. In it, they mandate a future vision of 80% of devices connected to IPv6 only networks by 2025. That’s not that far away. So, as many of our peers who work in US federal organizations are preparing for a world that is IPv6 only, we figured it might be time for us to do the same. 

Show Notes

2021 New Year’s resolutions for Linux users

It's a good idea to start each year with some ideas about how to make the new year better--even when it comes to working with Linux. This post offers some suggestions on how you might get more value and enjoyment from Linux in 2021.Commit favorite commands to aliases or scripts Linux commands make it easy to manipulate files and command output, but the cleverest commands can be very difficult to remember and reuse. Commit them to a script or alias, on the other hand, and you can give them meaningful names that are easy to remember  and use them easily  any time you need. Here's an example of a complicated Linux command turned into an alias:To read this article in full, please click here

Checking network connections with arp and ip neigh

Linux provides two very useful tools for diagnosing network troubles: arp and ip neigh.The arp command is a tool that allows you to display the IP-address-to-MAC-address mappings that a system has built so that it doesn't have to fetch the same information repeatedly for systems it communicates with. In doing this, arp allows you to discover and display details about systems on your network.The other is the arp command's younger brother, ip neigh, which can also display and manipulate arp tables. In this post, we'll take a look at how these commands work and what they can tell you.To read this article in full, please click here

Planning the Next Extended Coffee Break (Part 1)

Long story short: ipSpace.net is going on an extended coffee break on June 24th 2021. You can stop reading; the rest of the blog post is full of details you probably don’t care about.

What exactly does that mean? Honestly, we don’t know yet… but we felt that it’s only fair to let engineers considering our subscriptions know months in advance what might happen.

Also, after investing two lifetimes into this project, and a few planned changes coming just before our regular summer hiatus (see below) it’s time for a longer break. ipSpace.net might be back to business-as-usual after a few months (unlikely), or it could be Ivan working on some interesting stuff (most likely) or ipSpace.net slowly disappearing into the sunset (not impossible).

Read more …

Planning the Next Extended Coffee Break

Long story short: ipSpace.net is going on an extended coffee break on June 24th 2021 reducing the scope of activities on July 1st 2021. You can stop reading; the rest of the blog post is full of details you probably don’t care about.

What exactly does that mean? Since this blog post was published in January 2021, we pretty much figured out a way forward, and I’m glad we let engineers considering our subscriptions know months in advance what might happen.

Anyway, after investing two lifetimes into this project, and a few planned changes coming just before our regular summer hiatus (see below) it’s time for a longer break an adjustment. ipSpace.net will revert back to Ivan working on some interesting stuff.

Read more …

Add Friendly ID to a Rails 6 App

Friendly ID, is a ruby gem that makes adding slugs to your Rails records painless giving you nice human readible URI's. Instead of accessing URI's by their database ID: /site/23 they are accessed via /site/hogwarts instead. Much better. In this post I will show you how to add...

The OSI Model: STOP IT!

The OSI model is perhaps the best-known—and perhaps the most-loved—model in the networking world. It’s taught in every basic networking course, and just about every blog (other than this one) has some article explaining the model someplace or another (for instance, here is one of the better examples).

The reality is, however, that I’ve been in the networking business for 30’ish years and I’ve never once used the OSI model for anything practical. I’ve used the model when writing books because just about every book on networking has to have a section on the OSI model. I’ve used the model when writing a paper comparing two different protocols, back in the multiprotocol days (VIP versus IPX versus IP), but we don’t have those kinds of arguments very often any longer.

So, we all learn the OSI model, and yet I don’t know of anyone who actually uses the OSI model in understanding how protocols work, or how to troubleshoot a network. There’s the “it’s a layer two problem” statement, and that’s about the end its useful life, it seems.

Let me make a suggestion—learn, use, and teach the RINA model instead. Okay, so what is the RINA model? It is Continue reading

The Week in Internet News: U.S. Stimulus Bill Pumps Up Broadband

Broadband to the people: A new COVID-19 stimulus bill passed by the U.S. Congress includes $7 billion to help residents connect to broadband and pay their monthly bills, the Washington Post reports. The legislation is one of the largest one-time investments in broadband ever in U.S. history. “Nearly half the money is slated to fund a new monthly benefit for low-income families, aiming to ensure that those who have lost their jobs can stay online at a time when the pandemic has forced millions of people to work, learn and communicate on their devices from home.”

RIP Flash: Adobe has finally killed off the controversial Flash video and animation tool that was a formative technology for the Internet, the Independent says. While Flash was widely used on websites for many years, critics complained about security problems and a poor user experience. In 2009, 99 percent of all PCs with an Internet connection had Flash installed, Adobe has said.

Alexa, what taxes do I owe? The Indian government is working on Alexa-like chatbots to deliver public services, India Today reports. The government has invited bids for a voice assistant similar to Amazon’s Alexa and Google Assistant. Using artificial Continue reading

IoT adds smarts to IT asset monitoring

The Internet of Things (IoT) is beginning to play a key role in monitoring and maintaining internal IT systems and environments. With many IT pros working from home because of the coronavirus pandemic, IT teams are leveraging networked sensors to gauge the performance and condition of servers, storage systems, network devices, and other technology components.IoT can help organizations not only evaluate how well equipment in data centers is performing and when systems need to be updated or repaired, but also monitor environmental conditions and events such as air temperature, humidity, and water leaks. IoT systems can also help organizations detect intrusions that could result in downtime or data breaches.To read this article in full, please click here

Reviving Old Content, Part 3

We had the usual gloomy December weather during the end-of-year holidays, and together with the partial lockdown (with confusing ever-changing rules only someone in Balkans could dream up) it managed to put me in OCD mood… and so I decided to remove broken links from the old blog posts.

While doing that I figured out how fragile our industry is – I encountered a graveyard of ideas and products that would make Google proud. Some of those blog posts were removed, I left others intact because they still have some technical merits, and I made sure to write sarcastic update notices on product-focused ones. Consider those comments Easter eggs… now go and find them ;))

Anyway, I also salvaged some of the old content I was stupid enough to publish somewhere else from archive.org. Here it is:

Reviving Old Content, Part 3

We had the usual gloomy December weather during the end-of-year holidays, and together with the partial lockdown (with confusing ever-changing rules only someone in Balkans could dream up) it managed to put me in OCD mood… and so I decided to remove broken links from the old blog posts.

While doing that I figured out how fragile our industry is – I encountered a graveyard of ideas and products that would make Google proud. Some of those blog posts were removed, I left others intact because they still have some technical merits, and I made sure to write sarcastic update notices on product-focused ones. Consider those comments Easter eggs… now go and find them ;))

Read more …

BGP in 2020 – BGP Update Churn

The first part of this report looked at the size of the routing table and looked at some projections of its growth for both IPv4 and IPv6. However, the scalability of BGP as the Internet’s routing protocol also is related to the rate of dynamic routing updates. If the update rate of BGP is growing faster than we can deploy processing capability to match, then the routing system will lose coherence, and at that point the network will head into periods of instability. This second part of the BGP report looks at the profile of BGP updates across 2020
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