Disaster Recovery: a Vendor Marketing Tale
Several engineers formerly working for a large virtualization vendor were pretty upset with me when I claimed that the virtualization consultants promote “disaster recovery using stretched VLANs” designs instead of alternatives that would implement proper separation of failure domains.
Guess what… it’s even worse than I thought.
Here’s a sequence of comments I received after reposting one of my “disaster recovery doesn’t need stretched VLANs” blog posts on LinkedIn sometime in late 2019:
DNS Query Privacy Revisited
A year has passed since we first looked at the level of use of Query Name Minimisation in the DNS and at the time the results were not impressive. It's time to relook at this topic and see what has changed in the DNS resolution environment over the past 12 months.A smarter emacs
I’ve been running Emacs for like 25 years. But I’ve never really configured it with anything fancy.
Sure, I’ve set some shortcut keys, and enabled global-font-lock-mode
and set indent size, but that’s almost it.
All my coding is done in tmux&Emacs. One project gets exactly one tmux
session. Window 0 is emacs. Window 1 is make && ./a.out (sometimes
split panes to tail logs or run both server and client), and to run
git commands. The remaining windows are used for various things like
reading manpages etc….
I have that same workflow whether I’m editing a blog post or doing kernel programming.
This way I can work at my desk with large and plentiful screens, and then move to my laptop and everything continues working exactly the same.
tmux I’ve customized, but not that much with Emacs.
So, step one to get my coding environment to be less 1995, and more 2020: make my editor understand my code, and show me stuff about it.
I’m learning as I’m going, and writing what I’m learning. As always if you see something wrong then please leave a comment.
Code annotations and other semantic understanding
The way to do this is Continue reading
Spotlight on NSX Performance at VMworld 2020
As we ramp up towards one of the premiere online tech events — in one of the most extraordinary years of a lifetime — I would like to shine a spotlight on what is being planned around NSX performance during this year’s virtual conference to help you get the most out of the event. VMWorld 2020 is right around the corner — and for the first time in two decades, it’s free! So, Register Now if you haven’t done so already!
NSX Performance Thus Far
Over the years, we’ve looked at the NSX performance numbers with and without hardware-level features, such as Geneve Offload and Geneve Rx Filters, that are key to optimal performance. If these topics are new to you, I would encourage reading up on the performance section of the NSX-T Reference Design Guide for a working knowledge of NSX-T performance before attending this year’s NSX-T Performance Session at VMworld.
NSX-T Performance Session at VMworld 2020
Given the virtual format of this year’s NSX-T Performance Session, I’ve decided to take a slightly different approach. Not only will I share performance numbers, but I’ll also demonstrate how different hardware-level features influence performance, and I’ll discuss feature and tuning Continue reading
My Thoughts on LinkedIn in 2020
LinkedIn originated with a focus on connecting professionals and contacts were supposed to be people that you know or worked with. The early team worked hard to build a monopoly/network effect around business connections. Much of LinkedIn’s interface usability stems from that design intention. Now there is tension between what was LinkedIn was 10 years […]
The Hedge Podcast 51: Tim Fiola and pyNTM
Have you ever looked at your wide area network and wondered … what would the traffic flows look like if this link or that router failed? Traffic modeling of this kind is widely available in commercial tools, which means it’s been hard to play with these kinds of tools, learn how they work, and understand how they can be effective. There is, however, an open source alternative—pyNTM. While this tool won’t replace a commercial tool, it can give you “enough to go on” for many network operators, and give you the experience and understanding needed to justify springing for a commercial product.
Day Two Cloud 065: Building Your Cloud On-Ramp With SD-WAN
SD-WAN vendors offer a variety of mechanisms to connect end users to cloud applications while incorporating policy and performance requirements. Day Two Cloud co-host Ethan Banks interviewed many of these vendors to understand the architectural nitty-gritty of different approaches. In this episode, he shares the fruits of his research.
The post Day Two Cloud 065: Building Your Cloud On-Ramp With SD-WAN appeared first on Packet Pushers.
Day Two Cloud 065: Building Your Cloud On-Ramp With SD-WAN
SD-WAN vendors offer a variety of mechanisms to connect end users to cloud applications while incorporating policy and performance requirements. Day Two Cloud co-host Ethan Banks interviewed many of these vendors to understand the architectural nitty-gritty of different approaches. In this episode, he shares the fruits of his research.Network Vendor Loyalty Benefits Continue to Dwindle
It is imperative that you begin building relationships with multiple vendors that can help differentiate their products from others they're competing with.
Unimog – Cloudflare’s edge load balancer
As the scale of Cloudflare’s edge network has grown, we sometimes reach the limits of parts of our architecture. About two years ago we realized that our existing solution for spreading load within our data centers could no longer meet our needs. We embarked on a project to deploy a Layer 4 Load Balancer, internally called Unimog, to improve the reliability and operational efficiency of our edge network. Unimog has now been deployed in production for over a year.
This post explains the problems Unimog solves and how it works. Unimog builds on techniques used in other Layer 4 Load Balancers, but there are many details of its implementation that are tailored to the needs of our edge network.
The role of Unimog in our edge network
Cloudflare operates an anycast network, meaning that our data centers in 200+ cities around the world serve the same IP addresses. For example, our own cloudflare.com website uses Cloudflare services, and one of its IP addresses is 104.17.175.85. All of our data centers will accept connections to that address and respond to HTTP requests. By the magic of Internet routing, when you visit cloudflare.com and your Continue reading
Hacking Ethernet out of Fibre Channel cards
Hacking Ethernet out of Fibre Channel cards
This story, like another in the past, started as an eBay purchase that I wo
Where Do We Need Smart NICs?
We did a number of Software Gone Wild podcasts trying to figure out whether smart NICs address a real need or whether it’s just another vendor attempt to explore all potential markets. As expected, we got opposing views from Luke Gorrie claiming a NIC should be as simple as possible to Silvano Gai explaining how dedicated hardware performs the same operations at lower cost, lower power consumption and way higher speeds.
In theory, there’s no doubt that Silvano is right. Just look at how expensive some router line cards are, and try to figure out how much it would cost to get 25.6 Tbps of forwarding performance that we’ll get in a single ASIC (Tomahawk-4) in software (assuming ~10 Gbps per CPU core). High-speed core packet forwarding has to be done in dedicated hardware.
How Do We Ensure the Internet Grows and Improves? Start with the Internet Impact Assessment Toolkit
The Internet has been revolutionary for human progress. Bit by bit, byte by byte, it has come to underpin modern life. For those of us online today it is hard to imagine (or remember) a world where the Internet was not the fabric of our social lives, education, entertainment, innovation, and culture. But what makes the Internet such a success, and how can we ensure its future? What takes a “network of networks” and makes it the Internet? We’ve launched the Internet Way of Networking’s Internet Impact Assessment Toolkit (IIAT) to to help answer that question.
The current pandemic has showed us both the value and the opportunities the Internet holds. For societies to pivot to a reality where most of our lives became digital overnight is a true testament to the possibilities that are inherent in the Internet.
But while the Internet has proved its resilience under the weight of an online society, it is easy to forget that its fundamental premise is not about cables and computers, but about collaboratively interconnecting independent networks to a greater whole. Because what fundamentally makes up the Internet, and what it could grow to become in the future, is rooted in its Continue reading
Use TCL to Pingsweep a Subnet on a Cisco IOS Device
How to use TCL to pingsweep a subnet on a Cisco IOS device.Improving the moisture model – the final phase
Back from this post http://r2079.com/2020/03/17/telnyx-api-p-sms-and-aws-iot-saves-my-plants-every-single-time/, I did see that using Telnyx and Aws MQTT did indicate the moisture. All good, so why drag this topic ?
Links reference :
https://www.espressif.com/en/products/socs/esp32 – microcontroller used in the project
https://vruzend.com/ – lithium ion 18650 batteries
https://micropython.org/ – micropython
http://telnyx.com/ – Telecom provider
https://aws.amazon.com/ – Cloud provider
Well, there are multiple aspects to the design itself
- The system always required usb external power – batteries well dint last long
- The system always required to be internal or inside home – reason it wasnt weather resistant
- Costly [ Mqtt Push and and if plant dried out, it would make Telnyx API send me a lot of messages which in turn is a cost ]
- I never wanted a 24×7 system, I wanted something which comes online once per day and then sort of sleeps for rest of the day
- Wanted to use micropython, python programming language is something I always found easy on beginners like me, where as C and CPP are difficult in my opinion.
- I wanted something small and less or Continue reading