What’s the Future of Distributed Ledgers?

SEATTLE — Blockchain may no longer be at the peak of its hype cycle, but the technology is still sparking innovation, as real-life use cases emerge. Distributed ledgers (DLTs), for instance, which allow for the secure recording and transfer of digital assets without reliance on a centralized authority, have obvious advantages for financial organizations. DLTs are at the core of an emerging ecosystem built on open source. In this On the Road episode of The New Stack Makers, recorded at Open Source Summit North America, Hedera, and OSSNA keynote talk on DLTs with Alex Williams, founder and publisher of TNS. For DLTs, Baird said, “We have an open source ledger, the blockchain is open source, you can think of it like an operating system that’s open source. You can run programs on top of it that are open source, you can run programs on top of it that are not open source.” The layer built on top of all this is also open source. “We had to come up with an algorithm for how they’re going to talk Continue reading

NB485: A Final FU for Greg

Greg Ferro bids farewell to Network Break, and Drew Conry-Murray and Johna Till Johnson bid farewell to Greg. Of course, the podcast must go on, so we also cover some tech news. First, Nokia acquires optics maker Infinera, Broadcom brings new features to VMware Cloud Foundation (VCF), and campus switch sales drop. A Microsoft subsidiary... Read more »

The Keynote Answers You Expect

Keynote Starfield

Good morning! How are you?

I’d like to talk about keynotes, again. You know, one of my favorite subjects. I’ve been watching them intently for the past few years just hoping that we’re going to see something different. As a technical analyst and practitioner I love to see and hear the details behind the technology that drive the way our IT companies develop. Yet every year I feel more and more disappointed by the way that keynotes take everything and push it into the stratosphere to get an 80,000 foot view of the technology. It’s almost like the keynotes aren’t written for practitioners. Why? The answer lies in the statement at the top of this post.

Perfunctory Performances

When most people ask someone how their day is going they’re not actually looking for a real response. They most certainly aren’t asking for details on how exactly the person’s day is going. They’re usually looking for one of two things:

  1. It’s going great.
  2. It could be better.

Any more than that drags someone down into a conversation that they don’t want to have. Asking someone about their day is a polite way of acknowledging them and making a bit of small Continue reading

Making Segment Routing user-friendly

Segment Routing was supposed to make MPLS easier and give more power to network operators. Sadly, vendors decided to make it harder by selling weird protocols and over-engineered controller bloatware.

MPLS is actually great

Despite some anti-MPLS marketing from SD-WAN …

AWS Networking Fundamentals

AWS Networking Fundamentals

In my opinion, learning cloud networking is easier compared to traditional networking. You’ll see why as we go through the posts. Even if you're completely new to the cloud, you can get a simple lab up and running within a few hours. You don't need physical devices, cables, or complex topologies to get started.

Of course, you won’t become an expert in a few months, but you will build a solid foundation from which you can grow. The key is to start small, understand the basics, and experiment as you go.

There are multiple cloud providers out there, such as AWS, Azure, GCP, Alibaba Cloud, and so on. At a basic level, they all function the same from a networking point of view, though each has its own nuances and differences. As long as you're familiar with one provider, the knowledge is usually transferable. That said, our focus here is AWS. AWS has the largest market share in the cloud space, and it's also where I got started.

Audience

If you're brand new to AWS, don't worry. This post focuses on the basics of AWS networking. General networking knowledge is helpful but not required - I'll try to explain things Continue reading

Netlab Examples in GitHub Codespaces

A few days ago, someone asked me about the IPv4 next-hop details of running interface EBGP sessions. I pointed him to a blog post explaining them, adding, “And of course, you can test that in netlab.” A few minutes later, it hit me: instead of asking him to set up netlab locally, I could enable him to do that in a minute with GitHub codespaces.

Setting that up was easy: copy the .devcontainer directory from the BGP labs repository into the netlab examples repository and commit the change. After a short yak-shaving exercise (writing README files and rearranging a few folders), I successfully started the codespace and was ready for this blog post. There was just one gotcha…

Read more …

Netlab Examples in GitHub Codespaces

A few days ago, someone asked me about the IPv4 next-hop details of running interface EBGP sessions. I pointed him to a blog post explaining them, adding, “And of course, you can test that in netlab.” A few minutes later, it hit me: instead of asking him to set up netlab locally, I could enable him to do that in a minute with GitHub codespaces.

Setting that up was easy: copy the .devcontainer directory from the BGP labs repository into the netlab examples repository and commit the change. After a short yak-shaving exercise (writing README files and rearranging a few folders), I successfully started the codespace and was ready for this blog post. There was just one gotcha…

Read more …

Switching Jobs When You Love Your Current One

Switching Jobs When You Love Your Current One

How many times have you found yourself perfectly comfortable in your current job, only to be tempted by a new opportunity? We’ve all been there. It’s tough to leave a place where you know everyone and everything feels familiar. The new job might turn out to be fantastic, or it could be less than ideal. So, how do we overcome these fears and make the right choice? In this post, I’ll share my own journey, exploring what I learned from my experiences. Hopefully, my story can help you navigate your own career decisions with a bit more confidence.

💡
Please keep in mind that I’m sharing from my own experiences. While I hope you find my insights helpful, it’s important to make decisions based on your personal circumstances. What worked for me might not work for everyone, so consider your unique situation when planning your next career move 🙂

Early in My Career

I kicked off my career back in 2017, filled with an eagerness to learn and make rapid progress. During those early days, I was truly engaged in my work, often pulling long hours because all I could think about was advancing in my field. After spending a Continue reading

Palo Alto Load Partial Configuration

Palo Alto Load Partial Configuration

Hi all, welcome back to yet another Palo Alto Firewall blog. Have you ever wanted to load partial config from one Palo Alto Firewall to another or from a Firewall to Panorama and vice versa? There could be times when you just want to import all address objects from one Firewall to another, for example. We could do this in multiple ways, but there is a simple way of doing this. Let’s get into how you can achieve this with just a few steps.

To demonstrate this, I have a firewall and Panorama. On the firewall, there are a few address objects, address groups, and a security policy that I want to import into Panorama, inside a specific device group. Let’s walk through the steps.

  1. Export the configuration - Start by exporting the configuration from the firewall.
  2. Import it to Panorama - Next, import that configuration into Panorama.
  3. Identify the XPath of the objects - You'll need to find where the objects you want to copy are located in both the firewall and Panorama. Keep in mind, the XPath for these objects might be slightly different between the firewall and Panorama.
  4. Copy them over with a command - Finally, run Continue reading

How to Create Custom Jinja2 Filters?

How to Create Custom Jinja2 Filters?

Hi everyone, welcome back to another blog post on Jinja2 and Python. I'm not an expert in Jinja2; I know enough to get by and I'm always learning new things. I'm familiar with using Jinja2's built-in filters like upper, lower, and capitalize, but just a few days ago, I discovered something new. I can make my own filters! It was a real "wow, how did I not know that?" moment. In this post, let's dive into an example of how to do just that.

Generating Cisco Interface Configurations with Jinja2 Template
In this blog post, we will explore the process of generating Cisco interface configurations using Python and Jinja2. An interface configuration can vary depending on
How to Create Custom Jinja2 Filters?PacketswitchSuresh Vina
How to Create Custom Jinja2 Filters?

A Very Simple Example

Let's break down a very simple example of creating a custom Jinja2 filter. First, you need to understand the basic steps and the syntax involved. To start, you'll need to define a custom filter function in Python. This function will take an input, manipulate it as you specify, and return the modified output. In our example, the custom function will convert text to uppercase and add three exclamation marks at the end.

from  Continue reading

Oracle OCI Traffic Mirroring and Monitoring: VTAP Implementation and Analysis

Disclaimer: All writings and opinions are my own and are interpreted solely from my understanding. Please contact the concerned support teams for a professional opinion, as technology and features change rapidly.

My name is Stephen King, and you are reading my novel. Absolutely Not! He is the most incredible author of all time! And you are reading my blog! One of my many, many, many interests is traffic mirroring and monitoring in public clouds, especially inter-VCN/VPC traffic. Traffic from an instance is mirrored and sent for any analysis, whether regulatory or troubleshooting. I quickly set up something in my OCI; the results and learnings are fascinating.

TLDR: Traffic Mirroring and Monitoring in Oracle OCI using VTAPs

The diagram shows a sample implementation of a VTAP. Reference: https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/vtap.htm

Topology and a refresher

IGW helps us connect to the Internet, NLB helps us send traffic to VTAP-HOST mirrored from VTAP, and a DRG helps us communicate with other VCNs.

What is the end goal? Mirror and send all the traffic from Host-1 with IP 192.168.1.6 to VTAP-Host for further analysis.

Below is generated by OCI Network Visualiser, which is very cool.

A few things Continue reading

Terraform for Network Engineers: Part One

Terraform for Network Engineers: Part One

When I mention to my industry peers that I use Terraform to manage parts of my on-premise network infrastructure, I often get blank stares or a look of surprise. It's understandable — Terraform is usually associated with cloud infrastructure, not on-premise network devices. A quick Google search for "Terraform for Network Engineers" mostly brings up results about creating AWS VPCs, Azure VNETs, or deploying Palo Alto firewalls in AWS. There's not much out there about using Terraform for network devices like routers, switches, firewalls, and load balancers.

In this blog post series, I'll share my experience using Terraform to manage network devices and explain how it can benefit network engineers. While I'm not sure how many parts this series will have, I'll keep each post concise and informative, giving you the essentials to get started. If you have questions or need help, feel free to reach out.

Throughout the series, I'll use Palo Alto Network (Panorama) as the target, but the concepts can be applied to any network device that supports Terraform.

In Part One of this series, we'll cover the following topics:

  1. Introduction to Terraform.
  2. Understanding Terraform Terminology.
  3. Terraform Workflow.
  4. Deciding if Terraform is the Right Tool.
  5. Installing Terraform

Continue reading

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