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Category Archives for "Networking"

Cross Training for Career Completeness

Are you good at your job? Have you spent thousands of hours training to be the best at a particular discipline? Can you configure things with your eyes closed and are finally on top of the world? What happens next? Where do you go if things change?

It sounds like an age-old career question. You’ve mastered a role. You’ve learned all there is to learn. What more can you do? It’s not something specific to technology either. One of my favorite stories about this struggle comes from the iconic martial artist Bruce Lee. He spent his formative years becoming an expert at Wing Chun and no one would argue he wasn’t one of the best. As the story goes, in 1967 he engaged in a sparring match with a practitioner of a different art and, although he won, he was exhausted and thought things had gone on far too long. This is what encouraged him to develop Jeet Kun Do as a way to incorporate new styles together for more efficiency and eventually led to the development of mixed martial arts (MMA).

What does Bruce Lee have to do with tech? The value of cross training with different tech disciplines Continue reading

Creating a directory tree with a single command

The mkdir command can do more than create a single directory. It can create multiple directories at once and can even create an entire directory structure with a single command. The required command will be a tad complex, but not particularly challenging.NOTE: If you try to set up a multi-level directory structure with a command like the one shown below, it won't work if the initial directories ("this" and "that") don't already exist.$ mkdir this/that/the_othermkdir: cannot create directory ‘this/that/the_other’: No such file or directory Add a -p (for "parents") and the missing directories will be created and your this/that/the_other directory structure will be set up in your current directory as intended.To read this article in full, please click here

Creating a directory tree with a single command

The mkdir command can do more than create a single directory. It can create multiple directories at once and can even create an entire directory structure with a single command. The required command will be a tad complex, but not particularly challenging.NOTE: If you try to set up a multi-level directory structure with a command like the one shown below, it won't work if the initial directories ("this" and "that") don't already exist.$ mkdir this/that/the_othermkdir: cannot create directory ‘this/that/the_other’: No such file or directory Add a -p (for "parents") and the missing directories will be created and your this/that/the_other directory structure will be set up in your current directory as intended.To read this article in full, please click here

Tech Bytes: Deploying Sovereign Clouds With VMware And Tietoevry

Today on the Tech Bytes podcast, we explore the concept of sovereign clouds with sponsor VMware. Sovereign clouds provide the agility and scale of the cloud while ensuring data resides in a specific country or geography and meets area requirements for security and privacy. We speak with Tietoevry, one of the first VMware partners to offer major sovereign cloud solutions for its Nordic clients.

The post Tech Bytes: Deploying Sovereign Clouds With VMware And Tietoevry appeared first on Packet Pushers.

Tech Bytes: Deploying Sovereign Clouds With VMware And Tietoevry

Today on the Tech Bytes podcast, we explore the concept of sovereign clouds with sponsor VMware. Sovereign clouds provide the agility and scale of the cloud while ensuring data resides in a specific country or geography and meets area requirements for security and privacy. We speak with Tietoevry, one of the first VMware partners to offer major sovereign cloud solutions for its Nordic clients.

How Cloudflare Images addressed the aCropalypse vulnerability

How Cloudflare Images addressed the aCropalypse vulnerability
How Cloudflare Images addressed the aCropalypse vulnerability

Acropalypse (CVE-2023-21036) is a vulnerability caused by image editing tools failing to truncate images when editing has made them smaller, most often seen when images are cropped. This leaves remnants of the cropped contents written in the file after the image has finished. The remnants (written in a ‘trailer’ after the end-of-image marker) are ignored by most software when reading the image, but can be used to partially reconstruct the original image by an attacker.

The general class of vulnerability can, in theory, affect any image format if it ignores data written after the end of the image. In this case the applications affected were the ‘Markup’ screenshot editor that shipped with Google Pixel phones from the Pixel 3 (saving its images in the PNG format) and the Windows Snipping tool (with both PNG and JPEG formats).

Our customers deliver their images using Cloudflare Images products and may have images that are affected. We would like to ensure their images are protected from this vulnerability if they have been edited using a vulnerable editor.

As a concrete example, imagine a Cloudflare customer running a social network, delivering images using Cloudflare Images. A user of the social network might Continue reading

Catalyst SD-WAN – Bootstrapping a Catalyst8000v Using a File on Bootflash

Yesterday I showed how to bootstrap a Catalyst8000v from the CLI. Today, I will show how to put a file on bootflash which includes the configuration but also the root certificate and the certificate of the device. This is a bit of a more streamlined process and can also be useful if you don’t know what CLI commands to use as vManage will generate the configuration for you.

Starting out, we have a freshly booted router that is in autonomous mode (non-SD-WAN):

Router#sh ver | i operating
Router operating mode: Autonomous

To generate the bootstrap configuration, the process is to first go through the regular process of attaching a device to a template. Go to Configuration -> Templates and select Attach Devices:

Select the correct device:

Fill in the information needed:

Click Update to reflect the edits:

Then click Next:

Click Configure Devices and vManage will try to push the config but the device is offline:

Once this is done, vManage has all the information it needs to generate the bootstrap. Go to Configuration -> Devices and select the correct device and then Generate Bootstrap Configuration:

Then vManage will disply the following window. Choose Cloud-Init and have the box selected Continue reading

Heavy Networking 689: Prepping For Certification Exams With Mary Fasang

Certifications are a part of life in IT. On today's Heavy Networking we explore preparation strategies with guest Mary Fasang. Her certs run the gamut from CompTIA to MCSE to the CCNP, as well as the PMP and ITIL certs. How should you prepare for a cert in 2023 when there’s so much content, so many training options, as well as home labbing available? How do you handle failure? Which certs have been the hardest? What study materials have proved helpful? Mary shares her strategies.

The post Heavy Networking 689: Prepping For Certification Exams With Mary Fasang appeared first on Packet Pushers.

Heavy Networking 689: Prepping For Certification Exams With Mary Fasang

Certifications are a part of life in IT. On today's Heavy Networking we explore preparation strategies with guest Mary Fasang. Her certs run the gamut from CompTIA to MCSE to the CCNP, as well as the PMP and ITIL certs. How should you prepare for a cert in 2023 when there’s so much content, so many training options, as well as home labbing available? How do you handle failure? Which certs have been the hardest? What study materials have proved helpful? Mary shares her strategies.

Private 5G/LTE growing more slowly than expected

Private 5G/LTE networks for the enterprise are becoming increasingly common, but a new forecast from tech analyst firm IDC has found that several headwinds exist for the technology, which could slow its adoption over the next 18 to 24 months.The report, authored by IDC research manager Patrick Filkins, predicted that private cellular networking infrastructure sales will grow from $2.4 billion in global revenue this year to $5.3 billion in 2027.The use cases for private cellular networks are numerous and varied, according to IDC, encompassing everything from wide-area applications like grid networks for utility systems and transport networks to local networks for manufacturing facilities or warehouses.To read this article in full, please click here

AI is changing server sales but paying off for enterprises

The adoption of artificial intelligence is changing the way servers are being procured while having a quick and positive impact on firms that deploy AI technologies, according to a pair of research reports from Omdia.In its upcoming cloud and data center market report, the research firm predicts a reduction in the number of server shipments for the first time since 2007. However, the server drop in 2007 was due to a global economic crisis. The current shift in server buying has a more positive spin.Omdia found that demand for compute resources remains high. However, it also reports that demand for more expensive servers with specialized hardware for AI model training (translation: GPUs) are being prioritized over the typical enterprise server with just a CPU.To read this article in full, please click here

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