Hedge 304: Deep Dive into a Network Master’s Program

If you’ve ever been curious about what an advanced degree in network engineering looks like, you’ll want to join us for this episode of the Hedge. Levi Perigo from the University of Colorado at Boulder joins Tom and Russ to talk through what earning a Master’s in Networking involves and what kinds of things you would learn.
 

 
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Technology Short Take 195

Welcome to Technology Short Take #195! It wasn’t planned this way, but it seems like this Tech Short Take is heavily slanted toward AI/LLM-related articles and posts. Topics like security concerns around improper storage of API keys, how developers are using AI tools, spyware getting installed with AI assistants, and how AI/LLMs might be creating barriers to entry for new IT profesionals are all on tap this time around. I hope this unintentional focus doesn’t prevent you from finding something useful!

Networking

Security

Public Videos: Segment Routing 101

In the spring of 2017, Jeff Tantsura, the IETF Routing Area chair, delivered a short “Introduction to Segment Routing” webinar. In mid-April 2026, we had ~100 people at ITNOG 10 attending the excellent “Segment Routing: From Theory to Practice” workshop by the great Tiziano Tofoni. The future is obviously not evenly distributed.

If you’re in the early stages of your Segment Routing journey, you might appreciate the videos from Jeff’s webinar; you can now watch them without an ipSpace.net account.

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Building for the future

This afternoon, we sent the following email to our global team. One of our core values at Cloudflare is transparency, and we believe it's important that you hear this directly from us because it’s a major moment at Cloudflare. 

Team:

We are writing to let you know directly that we’ve made the decision to reduce Cloudflare’s workforce by more than 1,100 employees globally. 

The way we work at Cloudflare has fundamentally changed. We don’t just build and sell AI tools and platforms. We are our own most demanding customer. Cloudflare’s usage of AI has increased by more than 600% in the last three months alone. Employees across the company from engineering to HR to finance to marketing run thousands of AI agent sessions each day to get their work done. That means we have to be intentional in how we architect our company for the agentic AI era in order to supercharge the value we deliver to our customers and to honor our mission to help build a better Internet for everyone, everywhere. 

Today is a hard day. This decision unfortunately means saying goodbye to teammates who have contributed meaningfully to our mission and to building Cloudflare Continue reading

UniFi Network Health Report – Open Source Python Tool (v1.0.0)

If you run a self-hosted Ubiquiti UniFi network — whether it’s a home lab, small business, or multi-site setup — you know the UniFi dashboard is great for real-time monitoring but falls short when you want a clean summary you can save, share, or review later. I built UniFi Network Health Report to fill that...

The post UniFi Network Health Report – Open Source Python Tool (v1.0.0) first appeared on Fryguy's Blog.

How Cloudflare responded to the “Copy Fail” Linux vulnerability

On April 29, 2026, a Linux kernel local privilege escalation vulnerability was publicly disclosed under the name "Copy Fail" (CVE-2026-31431). Cloudflare’s Security and Engineering teams began assessing the vulnerability as soon as it was disclosed. We reviewed the exploit technique, evaluated exposure across our infrastructure, and validated that our existing behavioral detections could identify the exploit pattern within minutes. 

There was no impact to the Cloudflare environment, no customer data was at risk, and no services were disrupted at any point. Read on to learn how our preparedness paid off. 

Background

Our Linux kernel release process

Cloudflare operates a global Linux server infrastructure at an immense scale, with datacenters located across 330 cities. We maintain a custom Linux kernel build based on the community's Long-Term Support (LTS) versions to manage updates effectively at this volume. At any given time, we may utilize multiple LTS versions from various series, such as 6.12 or 6.18, which benefit from extended update periods.

The community regularly merges and releases security and stability updates which trigger an automated job to generate a new internal kernel build approximately every week. These builds undergo testing in our staging data centers to Continue reading

TCG075: Say the Thing: How the Network Automation Conference Circuit Shaped One SP Operator’s Voice

Eyvonne and William sit down with Joseph Nicholson, a Network Operations Engineer with NTT DATA, to share how public speaking transformed his career and technical experience. Joseph went from a terrifying ten minute lightning talk at AutoCon 2 to presenting 45-minute sessions at conferences like NANOG. Together they discuss how conversations in conference halls influenced... Read more »

When DNSSEC goes wrong: how we responded to the .de TLD outage

On May 5, 2026, at roughly 19:30 UTC, DENIC, the registry operator for the .de country-code top-level domain (TLD), started publishing incorrect DNSSEC signatures for the .de zone. Any validating DNS resolver receiving these signatures was required by the DNSSEC specification to reject them and return SERVFAIL to clients, including 1.1.1.1, the public DNS resolver operated by Cloudflare.

The country-code top-level domain for Germany, .de, is one of the largest on the Internet. On Cloudflare Radar, it consistently ranks among the most broadly queried TLDs globally. An outage at this level of the DNS hierarchy has the potential to make millions of domains unreachable.

In this post, we’ll walk through what we saw, the impact of these events, and how we applied temporary mitigations while DENIC resolved the issue.

How DNSSEC works

DNSSEC (Domain Name System Security Extensions) adds cryptographic authentication to DNS. When a zone is signed with DNSSEC, each set of records is accompanied by a digital signature known as an RRSIG record that lets a resolver verify the records haven’t been tampered with. Unlike encrypted DNS protocols, such as DNS over TLS (DoT) and DNS over HTTPs (DoH), DNSSEC is about Continue reading

Worth Reading 050626


DDoS mitigation often relies on BGP for “scrubbing”, but how this appears in routing data is not well understood. We analyse five major providers to distinguish between always-on and on-demand protection.

 


This column argues that without AI, adequate privacy has become simply out of reach. This is not because AI is benign; it most definitely is not. Rather, the modern digital ecosystem has evolved to a point where no human, unaided, can understand, monitor, or manage the complexity of today’s data practices.

 


Conventional memory schemes follow the Pareto Principle, in which approximately maintaining 20% hot data can meet 80% of requests. L

 


Google has just forked its Tensor Processing Unit, or TPU, designs for these two workloads, the very first time in more than a decade that TPU systems of the same generation were truly architecturally distinct from each other.

 


Fake domains are not a new problem. What’s now changing is the scale and how easily attackers can blend into your domain ecosystem with lookalikes, inactive registrations, and domains set up purely for email.

Hmmm: Cloudflare’s Automatic Return Routing

A while ago, I found the How Automatic Return Routing solves IP overlap article on Cloudflare’s blog. They evidently have a technology that addresses a pain point well worth solving (access to shared resources from clients using overlapping address ranges). I just hate how they’re selling it. Go read the article first; I’ll wait.

OK, here’s what bothers me: the “VRFs and NAT are bad” claims, while they use the same technology in disguise.

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