Heavy Networking 490: Lessons Learned From A Large SD-WAN Deployment

With more than 2,800 branch deployments in North America alone, our guest Snehal Patel is running one of the largest SD-WAN deployments on the globe. He stops by the Heavy Networking podcast to share his experiences, both good and bad, on deployment and operations, management, training, security, working with carriers, and more. Snehal is a global network architect for a brand-name retailer.

The post Heavy Networking 490: Lessons Learned From A Large SD-WAN Deployment appeared first on Packet Pushers.

A History of HTML Parsing at Cloudflare: Part 2

A History of HTML Parsing at Cloudflare: Part 2
A History of HTML Parsing at Cloudflare: Part 2

The second blog post in the series on HTML rewriters picks up the story in 2017 after the launch of the Cloudflare edge compute platform Cloudflare Workers. It became clear that the developers using workers wanted the same HTML rewriting capabilities that we used internally, but accessible via a JavaScript API.

This blog post describes the building of a streaming HTML rewriter/parser with a CSS-selector based API in Rust. It is used as the back-end for the Cloudflare Workers HTMLRewriter. We have open-sourced the library (LOL HTML) as it can also be used as a stand-alone HTML rewriting/parsing library.

The major change compared to LazyHTML, the previous rewriter, is the dual-parser architecture required to overcome the additional performance overhead of wrapping/unwrapping each token when propagating tokens to the workers runtime. The remainder of the post describes a CSS selector matching engine inspired by a Virtual Machine approach to regular expression matching.

v2 : Give it to everyone and make it faster

In 2017, Cloudflare introduced an edge compute platform - Cloudflare Workers. It was no surprise that customers quickly required the same HTML rewriting capabilities that we were using internally. Our team was impressed with the platform Continue reading

IP Fabric with Gian-Paolo Boarina on Software Gone Wild

No, we were not talking about IP fabrics in general - IP Fabric is a network management software (oops, network assurance platform) Gian Paolo discovered a while ago and thoroughly tested in the meantime.

He was kind enough to share what he found in Episode 107 of Software Gone Wild, and as Chris Young succinctly summarized: “it’s really sad what we still get excited about something 30 years after it was first promised”… but maybe this time it really works ;)

Listen to the podcast

TLA+ model checking made symbolic

TLA+ model checking made symbolic Konnov et al., OOPSLA’19

TLA+ is a formal specification language (Temporal Logic of Actions) particularly well suited to reasoning about distributed algorithms. In addition to the specification language, the TLA+ toolset includes a model checker (TLC) and a theorem prover (TLAPS).

Given the huge state spaces involved in many real-world settings, the TLC model checker can take a long time / a lot of resources to run.

While progress towards proof automation in TLAPS has been made in the last years, writing interactive proofs is still a demanding task. Hence, the users prefer to run TLC for days, rather than writing proofs.

Like many people (?!), I often find myself wishing I had the time (and skills!) to model some of the algorithms in the papers I read and taken them for a spin in a checker. So anything that can help make that a little bit more tractable is interesting to me.

This paper introduces an alternative symbolic model checker for TLA+ called APALACHE:

Unlike TLC, APALACHE translates the underlying transition relation into quantifier-free SMT constraints, which allows us to exploit the power of SMT solvers.

The Continue reading

Member News: Innovative Projects to Help Close the Digital Divide

Vote of Confidence: Voting is open for Chapterthon 2019, the global Internet Society Chapters marathon, where Chapters can develop projects within a timeline and budget to achieve a common goal for the development of the Internet. This year’s theme is Connecting the Unconnected. Twenty-eight Chapters – from Argentina to Zimbabwe – have submitted projects.

Keep the connections: The Venezuela Chapter is among several groups calling for large technology companies to maintain the availability of their services to Venezuelans. While an executive order from U.S. President Donald Trump seeks to block support for the government of Nicolás Maduro, the order does not ban the Internet and other technology services from serving the nation, the chapter notes. Access to the Internet and online services is “critical” because it brings access to independent news and allows citizens to express their opinions, the chapter said.

Trading chips: The Washington, D.C., Chapter recently hosted a conference on digital trade, including the impact of some nations’ policies that require data to be stored locally. “Data has become the most traded good and/or service across borders,” the Chapter said. “Meanwhile, many countries have adopted policies that inhibit digital trade, including requirements that Continue reading

Top 5 SD-WAN Takeaways for 2019

SD-WAN has reached an inflection point as enterprises — driven by cost savings, equipment...

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Upcoming Events and Webinars (December 2019)

The registration is still open for the Using VXLAN to Build Active-Active Data Centers workshop on December 3rd, but if you can’t make it to Zurich you might enjoy these live sessions we’ll run in December 2019:

All webinars I mentioned above are accessible with Standard ipSpace.net Subscription, and you’ll need Expert Subscription to enjoy the automation course contents.

A History of HTML Parsing at Cloudflare: Part 1

A History of HTML Parsing at Cloudflare: Part 1
A History of HTML Parsing at Cloudflare: Part 1

To coincide with the launch of streaming HTML rewriting functionality for Cloudflare Workers we are open sourcing the Rust HTML rewriter (LOL  HTML) used to back the Workers HTMLRewriter API. We also thought it was about time to review the history of HTML rewriting at Cloudflare.

The first blog post will explain the basics of a streaming HTML rewriter and our particular requirements. We start around 8 years ago by describing the group of ‘ad-hoc’ parsers that were created with specific functionality such as to rewrite e-mail addresses or minify HTML. By 2016 the state machine defined in the HTML5 specification could be used to build a single spec-compliant HTML pluggable rewriter, to replace the existing collection of parsers. The source code for this rewriter is now public and available here: https://github.com/cloudflare/lazyhtml.

The second blog post will describe the next iteration of rewriter. With the launch of the edge compute platform Cloudflare Workers we came to realise that developers wanted the same HTML rewriting capabilities with a JavaScript API. The post describes the thoughts behind a low latency streaming HTML rewriter with a CSS-selector based API. We open-sourced the Rust library as it can also be used Continue reading

Introducing the HTMLRewriter API to Cloudflare Workers

Introducing the HTMLRewriter API to Cloudflare Workers
Introducing the HTMLRewriter API to Cloudflare Workers

We are excited to announce that the HTMLRewriter API for Cloudflare Workers is now GA! You can get started today by checking out our documentation, or trying out our tutorial for localizing your site with the HTMLRewriter.

Want to know how it works under the hood? We are excited to tell you everything you wanted to know but were afraid to ask, about building a streaming HTML parser on the edge; read about it in part 1 (and stay tuned for part two coming tomorrow!).

Faster, more scalable applications at the edge

The HTMLRewriter can help solve two big problems web developers face today: making changes to the HTML, when they are hard to make at the server level, and making it possible for HTML to live on the edge, closer to the user — without sacrificing dynamic functionality.

Since the introduction of Workers, Workers have helped customers regain control where control either wasn’t provided, or very hard to obtain at the origin level. Just like Workers can help you set CORS headers at the middleware layer, between your users and the origin, the HTMLRewriter can assist with things like URL rewrites (see the example below!).

Back Continue reading

My IETF 106

The 106th meeting of the IETF was in Singapore in November 2019. As usual for the IETF, there were many Working Group meetings, and this report is definitely not an attempt to cover all of these meetings or even anything close to that. Here I’ve been highly selective and picked out just the items that I found interesting from the sessions I attended.

Compute Express Link Eyes Hardware Push in 2021

CXL has big beneficial implications for a wide range of industries, including high-performance...

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Verizon, Ericsson, and Qualcomm Boast DSS Advancements

The technology is still, at least partially, theoretical because it remains under development and...

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Harnessing the Power of the People: Cloudflare’s First Security Awareness Month Design Challenge Winners

Harnessing the Power of the People: Cloudflare’s First Security Awareness Month Design Challenge Winners

Grabbing the attention of employees at a security and privacy-focused company on security awareness presents a unique challenge; how do you get people who are already thinking about security all day to think about it some more? October marked Cloudflare’s first Security Awareness Month as a public company and to celebrate, the security team challenged our entire company population to create graphics, slogans, and memes to encourage us all to think and act more securely every day.

Employees approached this challenge with gusto; global participation meant plenty of high quality submissions to vote on. In addition to being featured here, the winning designs will be displayed in Cloudflare offices throughout 2020 and the creators will be on the decision panel for next year’s winners. Three rose to the top, highlighting creativity and style that is uniquely Cloudflarian. I sat down with the winners to talk through their thoughts on security and what all companies can do to drive awareness.

Eugene Wang, Design Team, First Place

Harnessing the Power of the People: Cloudflare’s First Security Awareness Month Design Challenge Winners

Sílvia Flores, Executive Assistant, Second Place

Harnessing the Power of the People: Cloudflare’s First Security Awareness Month Design Challenge Winners

Scott Jones, e-Learning Developer, Third Place

Security Haiku

Wipe that whiteboard clean‌‌
Visitors may come and see
Secrets not for them

No tailgating please
You may be a Continue reading

Gelsinger’s Greatest Hits on VMware’s Q3 Earnings Call

VMware CEO Pat Gelsinger said he expects Carbon Black combined with VMware’s “security-driven...

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Winners of the 2019 Chapterthon To Be Announced On 11 December – Voting Is Open Now!

"Connecting the unconnected" on a delegate's t-shirt at the 4th annual Summit on Community Networks in Africa

We’re thrilled to showcase this year’s creative, innovative and impactful projects aimed at ‘Connecting the Unconnected’. These short-term projects were run by twenty-eight of our Chapters that participated in the 2019 Chapterthon. We highly encourage you to take a few minutes to view the amazing work accomplished by your peers, and vote for your favorite project.

The winners of the 2019 Chapterthon will be announced during the upcoming Community Forum on 11 December, 13:00 UTC. Please join us in celebrating the amazing projects. The winning Chapters will be rewarded with a 1st prize of 3000 USD, 2nd prize of 2000 USD, and 3rd prize of 1000 USD. 

Make your vote count before 6 December: vote now. 

Find out who the winners are on 11 December: register here.

Image credit: © Internet Society / Nyani Quarmyne / Panos Pictures

The post Winners of the 2019 Chapterthon To Be Announced On 11 December – Voting Is Open Now! appeared first on Internet Society.

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