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Category Archives for "Networking"

Using the ldd command on Linux

Shared object files streamline programs by providing information applications need to do their jobs, but that don't have to be part of the application itself. To find out which of these files a Linux command calls on, use the ldd command.What is a shared object file? Shared object files (designated as .so) are libraries that are automatically linked into a program when the program starts, yet exist as a standalone files. They contain information that can be used by one or more programs to offload resources so that any program calling a .so file doesn't itself have to actually provide all the needed tools. These files can be linked to any program and be loaded anywhere in memory.To read this article in full, please click here

Surprise! The metaverse could be great news for the enterprise edge

When you think about the metaverse and the enterprise, do you think about millions of workers buzzing about in a virtual world to do their work?  Maybe employees picking Star Wars characters as avatars and fighting with light sabers?  CEOs likely blanch at that image; to most, virtual workers implies virtual work, and it’s hard to say how that generates real sales and products.  Fortunately, there’s an alternative that depends not on enterprises using the metaverse but on riding its coattails.If you ask enterprises what they think about the next frontier in cloud computing is, the responses are mixed between “the edge” and “IoT”, and of course the latter is really an example of an edge application. Well that frontier may be delayed because service providers would have to make a significant investment in infrastructure just to create an edge/IoT option for enterprises, and most enterprises aren’t willing to start planning for that next frontier until services are available. With buyers waiting for services and sellers wanting proven demand, we could be in for an era of false starts, edge-wise.To read this article in full, please click here

Using the ldd command on Linux

Shared object files streamline programs by providing information applications need to do their jobs, but that don't have to be part of the application itself. To find out which of these files a Linux command calls on, use the ldd command.What is a shared object file? Shared object files (designated as .so) are libraries that are automatically linked into a program when the program starts, yet exist as a standalone files. They contain information that can be used by one or more programs to offload resources so that any program calling a .so file doesn't itself have to actually provide all the needed tools. These files can be linked to any program and be loaded anywhere in memory.To read this article in full, please click here

Cisco DevNet certs jump 50%, fanned by network automation

Software skills are becoming increasingly desirable for network engineers and architects, and the uptick in Cisco’s DevNet certification program reflects the trend. According to Cisco, there’s been more than 50% growth in the number of DevNet certifications awarded in the past year.Cisco says it no longer gives out specific numbers, but in 2020, nearly 8,000 participants earned some 10,500 DevNet certifications, including DevNet Associate, DevNet Professional and DevNet Specialist. These DevNet certifications focus on coding, automation, network access, IP connectivity, security and application development on Cisco platforms, as well as what developers need to know about network doctrines.To read this article in full, please click here

Surprise! The metaverse could be great news for the enterprise edge

When you think about the metaverse and the enterprise, do you think about millions of workers buzzing about in a virtual world to do their work?  Maybe employees picking Star Wars characters as avatars and fighting with light sabers?  CEOs likely blanch at that image; to most, virtual workers implies virtual work, and it’s hard to say how that generates real sales and products.  Fortunately, there’s an alternative that depends not on enterprises using the metaverse but on riding its coattails.If you ask enterprises what they think about the next frontier in cloud computing is, the responses are mixed between “the edge” and “IoT”, and of course the latter is really an example of an edge application. Well that frontier may be delayed because service providers would have to make a significant investment in infrastructure just to create an edge/IoT option for enterprises, and most enterprises aren’t willing to start planning for that next frontier until services are available. With buyers waiting for services and sellers wanting proven demand, we could be in for an era of false starts, edge-wise.To read this article in full, please click here

MPLS/LDP Creation Myths

Hannes Gredler wrote an interesting comment to my Segment Routing vs LDP in Hub-and-Spoke Networks blog post:

In 2014 when I did the first prototype implementation of MPLS-SR node labels, I was stunned that just with an incremental add of 500 lines of code to the vanilla IPv4/IPv6 IS-IS codebase I got full any-to-any connectivity, no sync issues, no targeted sessions for R-LFA …. essentially labeled transport comes for free.

Based on that, one has to wonder “why did we take the LDP detour and all the complexity it brings?”. Here’s what Hannes found out:

Read more …

MPLS/LDP Creation Myths

Hannes Gredler wrote an interesting comment to my Segment Routing vs LDP in Hub-and-Spoke Networks blog post:

In 2014 when I did the first prototype implementation of MPLS-SR node labels, I was stunned that just with an incremental add of 500 lines of code to the vanilla IPv4/IPv6 IS-IS codebase I got full any-to-any connectivity, no sync issues, no targeted sessions for R-LFA …. essentially labeled transport comes for free.

Based on that, one has to wonder “why did we take the LDP detour and all the complexity it brings?”. Here’s what Hannes found out:

Read more …

AMD’s new EPYC chips are out, with bigger cache for intense workloads

AMD is adding four new processor SKUs to its EPYC (formerly codenamed Milan-X) lineup of high-end chips, building additional L3 cache capability onto the existing EPYC series.The key new feature of the new 7773X, 7573X, 7473X, and 7373X chips, which were initially announced in a roadmap made public late last year, is in their physical construction — AMD refers to the new technique as 3D V-Cache. Where most processors are constructed with a single piece of silicon inside, the new AMD chips mount a second microprocessor die atop the first one, which allows for a larger L3 cache.IDC's research vice president for computing semiconductors, Shane Rau, said that this is an important feature for the very high-end applications that AMD is targeting with the EPYC series, which AMD groups under the rubric of "technical computing" — highly demanding enterprise workloads like modeling and visualization, as well as academic and scientific applications.To read this article in full, please click here

AMD’s new EPYC chips are out, with bigger cache for intense workloads

AMD is adding four new processor SKUs to its EPYC (formerly codenamed Milan-X) lineup of high-end chips, building additional L3 cache capability onto the existing EPYC series.The key new feature of the new 7773X, 7573X, 7473X, and 7373X chips, which were initially announced in a roadmap made public late last year, is in their physical construction — AMD refers to the new technique as 3D V-Cache. Where most processors are constructed with a single piece of silicon inside, the new AMD chips mount a second microprocessor die atop the first one, which allows for a larger L3 cache.IDC's research vice president for computing semiconductors, Shane Rau, said that this is an important feature for the very high-end applications that AMD is targeting with the EPYC series, which AMD groups under the rubric of "technical computing" — highly demanding enterprise workloads like modeling and visualization, as well as academic and scientific applications.To read this article in full, please click here

How to enable Recurring Cloudwatch Alarms?

If you do not deal with AWS/CloudWatch you don’t have to read this post.

What: The issue was simple, we had a cloud watch alarm for Lambda Function invocation, now the way I wanted was to send us recurring email notifications if the alarm was not addressed, apparently this is not a cloud-watch native feature and there is a work-around for this.

Short Story: Implementing this will have a new step function which will start alarming based on an alert-timer, this won’t by default apply to all the alarms that you configure, you need to specifically tag it with a keyword, more of those options detailed in the article, so based on the timer you set, Cloud-watch say send SNS notification or any action of your choice to get implemented.

Link:https://aws.amazon.com/blogs/mt/how-to-enable-amazon-cloudwatch-alarms-to-send-repeated-notifications/

Why Article if you have a Link that explains ?: To start with not everything that I encountered was straightforward, the install process requires you to have a docker environment, and a proper node install and then a CDK install, I never did that and it did waste some time so I wanted to document and also this might help anyone to implement the same.

Spoilers:

Continue reading

Tech Bytes: Apstra Extends Intent-Based Data Center Networking To The Edge (Sponsored)

Today on the Tech Bytes podcast we’re talking about a new release of Juniper’s Apstra intent-based networking platform for data centers. Apstra is introducing new features including a collapsed fabric to extend intent-based networking to edge locations and a new capability that enables group-based policies for more fine-grained policy enforcement.

The post Tech Bytes: Apstra Extends Intent-Based Data Center Networking To The Edge (Sponsored) appeared first on Packet Pushers.

Revocation

A compromised private key should not be accepted. An attacker might use a compromised private key to impersonate a site, and this vulnerability needs to be prevented to ensure that users can use services over the network with trust in their integrity and security. The way to stop a compromised key from being accepted is to disseminate the information that the key is no longer trustable, and this is achieved by revoking the public key certificate. But we are having some problems in taking this theory and creating practical implementations of certificate revocation.

Network performance update: Security Week

Network performance update: Security Week
Network performance update: Security Week

Almost a year ago, we shared extensive benchmarking results of last mile networks all around the world. The results showed that on a range of tests (TCP connection time, time to first byte, time to last byte), and on different measures (p95, mean), Cloudflare was the fastest provider in 49% of networks around the world. Since then, we’ve worked to continuously improve performance towards the ultimate goal of being the fastest everywhere. We set a goal to grow the number of networks where we’re the fastest by 10% every Innovation Week. We met that goal last year, and we’re carrying the work over to 2022.

Today, we’re proud to report we are the fastest provider in 71% of the top 1,000 most reported networks around the world. Of course, we’re not done yet, but we wanted to share the latest results and explain how we did it.

Measuring what matters

To quantify network performance, we have to get enough data from around the world, across all manner of different networks, comparing ourselves with other providers. We used Real User Measurements (RUM) to fetch a 100kb file from several different providers. Users around the world report the performance of different providers. Continue reading

A New One-Stop Shop for Network Security Topics

Your trusty NSX blog is going through a big change.

We’re uniting our VMware security content in the newly designed VMware Security blog.  

Don’t worry, you’ll still be able to find the latest on network automation, application mobility, and load balancing. All the networking content you count on, that’s staying right here.  

However, if you’re looking for current and future articles on network security and threat research, those will now be found in a new home—a blog that centralizes security content across VMware into a single channel.    

You no longer need to switch (blog) channels for security news, insights, and resources. The newly designed VMware Security Blog will become your new one-stop-shop for key perspectives from experts, specialists, and leaders across VMware NSX, Threat Analysis Unit, and Carbon Black.  

On the new blog, you can expect to find all the network security content you know and love — including:  

  • Important insights and announcements regarding threat research, endpoint security, and network security
  • Key analysis of recent ransomware attacks, insights on techniques deployed, and how threats can be detected and mitigated
  • Infographics, data points, and award recognition illustrating the strength of VMware security solutions
  • Invites Continue reading

Use Multi-Availability Zone Kubernetes for Disaster Recovery

Nicolas Vermandé Nicolas is the principal developer advocate at Ondat. He is an experienced hands-on technologist, evangelist and product owner who has been working in the fields of cloud native technologies, open source software, virtualization and data center networking for the past 17 years. Passionate about enabling users and building cool tech solving real-life problems, you'll often see him speaking at global tech conferences and online events. Outages and degraded performance are inevitable. Operators make mistakes; new protocols introduce errors, natural disasters damage equipment and more. That’s why rather than trust Amazon’s ability to design a hurricane-proof data center, most platform managers opt to spread their application’s infrastructure across multiple availability zones (AZs). AZ outages aren’t terribly common, but

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