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SSH has no Host header
A dive into how we share IPs between VMs while making SSH work.
New
The latest blog posts to take off on Hacker News. 3,021 posts.
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Starlink Mini as a failover
I recently picked up a Starlink Mini to use as a backup connection for my home network. The underlying technology is fascinating - thousands of satellites in low Earth orbit delivering broadband almost anywhere. With the new £4.50 standby plan, it's an excellent way to keep things online.
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Cert Authorities Check for DNSSEC from Today
From 15 March 2026, CAs must validate DNSSEC on CAA lookups and ACME checks. I've run DNSSEC for 14 years; see if your registrar supports it.
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A most elegant TCP hole punching algorithm
The algorithm in this post needs “double buckets” to be reliable. Otherwise, the two sides can split on bucket boundaries and fail to converge. If the first bucket fails, compute an additional bucket step for convergence. My algorithm trades slow startup for less infrastructure.
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New 'negative light' technology hides data transfers in plain sight
Researchers have developed a ‘negative luminescence’ system to create an innovative way of sending hidden information.
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The dead Internet is not a theory anymore
Bots have taken over
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Cloudflare crawl endpoint
Browser Rendering's new /crawl endpoint lets you submit a starting URL and automatically discover, render, and return content from an entire website as HTML, Markdown, or structured JSON.
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Boy I was wrong about the Fediverse
I have never been an "online community first" person. The internet is how I stay in touch with people I met in real life. I'm not a "tweet comments at celebrities" guy. I was never funny enough to be the funniest person on Twitter. So when Twitter was accidentally
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The shady world of IP leasing
The IPv4 "exhaustion" is not real. The addresses got hoarded and the market devolved into a wild sub-leasing economy where anyone can choose where their IPs appear from, who owns them on paper, and scrub them clean of any history.
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Good Bad ISPs
Defend yourself against tracking and surveillance. Circumvent censorship. | Good Bad ISPs
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World-first gigabit laser link between aircraft and geostationary satellite
Faster, more secure connections from space could one day make broadband on planes, ships and even remote roads as easy as turning on a light. The European Space Agency (ESA), Airbus Defence and Space, the Netherlands Organisation for Applied Scientific Research (TNO) and German payload manufacturer TESAT (as…
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You can use newline characters in URLs
We locate web content using special addresses called URLs. We are all familiar with addresses like https://google.com. Sometimes, URLs can get long and they can become difficult to read. Thus, we might be tempted to format them like so in HTML using newline and tab characters, like so: <a…
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Robust and efficient quantum-safe HTTPS
Today we're announcing a new program in Chrome to make HTTPS certificates secure against quantum computers. The Internet Engineering Task Force (IETF) recently created a…
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Using the new bridges of FreeBSD 15
FreeBSD 15 comes with a new bridging implementation which has native support for VLANs. They have also soft-deprecated the ability to have any layer 3 addresses on member interfaces which makes it behave like a real hardware switch. The net.link.bridge.member_ifaddrs sysctl controls this behavior and it will …
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Tailscale Peer Relays is now generally available
Work around hard NATs and tricky networks with production-grade connectivity nodes you control
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Use protocols, not services
The Internet is almost anonymous and privacy-preserving by design. I mean, unless some administrator actively tries to track you, there is no built-in...
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What your Bluetooth devices reveal
Building Bluehood, a Bluetooth scanner that reveals what information we leak just by having Bluetooth enabled on our devices.
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Running My Own XMPP Server
Notes from setting up Prosody in Docker for federated messaging, with file sharing, voice calls, and end-to-end encryption.
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You can't trust the internet anymore
I like things that are strange and a bit obscure. It’s a habit of mine, and a lot of this blog is to document things I haven’t heard of before, because I wan...
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7zip.com Is Serving Malware
A convincing lookalike of the popular 7-Zip archiver site has been silently turning victims’ machines into residential proxy nodes.
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Welcoming Discord users amidst the challenge of Age Verification
Matrix, the open protocol for secure decentralised communications
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A brief history of barbed wire fence telephone networks (2024)
If you look at the table of contents for my book, Other Networks: A Radical Technology Sourcebook, you’ll see that entries on networks before/outside the internet are arranged first by underl…
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Major European payment processor can't send email to Google Workspace users
Viva.com, one of Europe's largest payment processors, sends verification emails without a Message-ID header — a requirement of RFC 5322 since 2008. Google Workspace rejects them outright. Their support team's response to my detailed bug report: your account has a verified email, so there's no problem.
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Reports of Telnet's death have been greatly exaggerated
Terrace runs sensors attackers cannot tell from real targets. We see new attack sources first, record what they do, and ship the block rules while the attack is still running.
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The Day the Telnet Died
On January 14, 2026, global telnet traffic observed by GreyNoise sensors fell off a cliff. A 59% sustained reduction, eighteen ASNs going completely silent, five countries vanishing from our data entirely. Six days later, CVE-2026-24061 dropped. Coincidence is one explanation.
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Upcoming changes to Let's Encrypt and how they affect XMPP server operators
On 11th February, Let’s Encrypt will be rolling out a change to the certificates they issue to servers by default. Although there is generally nothing that Prosody operators need to do, servers using the new certificates may experience problems connecting to some other XMPP servers on the network.
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Discord Alternatives, Ranked
Building an online community takes more than tools. But the right tool can make all the difference.
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