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HTTP/3: Everything you need to know about the next-generation web protocol
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Networking & Internet
The most popular blog posts about networking & internet on Hacker News. 3,019 posts.
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I discovered caching CDNs were throttling my everyday browsing
Update: 28 Nov 2023 Zen Internet and I have amicably parted ways over this matter. Their technical response has been added to this post.
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Valorant's 128-Tick Servers (2020)
Hi, I’m Brent “Brentmeister” Randall and I’m an engineer on the Gameplay Integrity team for VALORANT . My team is responsible for VALORANT ’s build system, automation framework, game client performance, and server performance. In this arti…
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Progress Towards 100% HTTPS, June 2016
Our goal with Let’s Encrypt is to get the Web to 100% HTTPS. We’d like to give a quick progress update. Let’s Encrypt has issued more than 5 million certificates in total since we launched to the general public on December 3, 2015. Approximately 3.8 million of those are active, meaning unexpired and unrevoked. Our…
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My Own DNS Server at Home – Part 1: IPv4
“It’s always DNS” is a famous meme among network people. Name resolution is technically quite simple. It’s “just” translating a hostname like jan.wildeboer.net to an IP address. What could possibly go wrong? I am a radical optimist and detail-obsessed knowledge collector, so I decided to find out. As part of my goal…
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Negotiating PoE+ Power in the Pre‑Boot Environment
Solving a boot-time power challenge on PoE+ x86 systems by creating our own UEFI app to handle LLDP power negotiation at the firmware level, allowing our machines to request higher power from network switches before the OS loads.
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No need to email me about Cisco AnyConnect
My name and email address can be found in the VPN client application made by Cisco called AnyConnect. They are present there as part of the curl license, because this product - like thousands of others - uses libcurl. My name appears in many products. Apparently, people often have problems finding an appropriate…
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Exploring the Halo 1 System Link Protocol
One of my all-time favorite games is Halo: Combat Evolved that launched together with the original Xbox in 2001. One major part of the game was multiplayer, up to 16 people at a LAN party could play together by connecting four Xbox consoles over Ethernet , referred to as System Link .
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Iraq Blocks Telegram, Leaks Blackhole BGP Routes
This past weekend, the government of Iraq blocked the popular messaging app Telegram, citing the need to protect Iraqi’s personal data. However, when an Iraqi government network leaked out a BGP hijack used for the block, it became yet another BGP incident that was both intentional, but also accidental. Thankfully…
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Let's Talk About Beacons
Let's Talk About Beacons If you’ve been following the tech scene lately, you may have heard a thing or two about “Beacons”. What are Beacons? Beacons are hardware devices emitting a unique signature...
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Technical Details Behind a 400Gbps NTP Amplification DDoS Attack
On Monday we mitigated a large DDoS that targeted one of our customers. The attack peaked just shy of 400Gbps. We've seen a handful of other attacks at this scale, but this is the largest attack we've seen that uses NTP amplification.
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Mullvad: Shutting down our search proxy Leta
On November 27, 2025, we will shut down our search proxy, Leta.
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Firefox 143 for Android to introduce DoH
All web browsing starts with a DNS query to find the IP address for the desired service or website. For much of the internet’s history, this query is sen
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Tor's Fall Harvest: The Next Generation of Onion Services
We are hyped to present the next generation of onion services! We've been working on this project non-stop for the past 4 years and we officially launched it two weeks ago by publishing our first alpha releases. All in all, the new system is a well needed improvement that fixes many shortcomings of the old design, and…
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The people holding up the internet
Four billion phones ask one text file what time it is, kept by a UCLA lecturer in his spare time. We counted who maintains the code under your phone.
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The DisplayPort Pin 20 Problem
When you read up on the DisplayPort connector in the VESA specification, it will show that both the source and the sink are supposed to provide power at 3.3V+-10% and 500mA on the DP_PWR pin, pin 20, of the connector.
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Cyberespionage Using SS7 via Circles
Circles is a surveillance firm that reportedly exploits weaknesses in the global mobile phone system to snoop on calls, texts, and the location of phones around the globe, and is affiliated with NSO Group, which develops the oft-abused Pegasus spyware. Using Internet scanning, we found a unique signature associated…
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Last week's Let's Encrypt downtime
How I detected that Let's Encrypt issued 645 non-compliant certificates
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Envoy Mobile
Today we are thrilled to announce the initial OSS preview release of Envoy Mobile, an iOS and Android client network library that brings…
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Mapping the internet with Hilbert curves
The internet is big. Really big . You just won’t believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think the /22 you got as a LIR was big, but that’s just peanuts to the internet.
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Searches for VPN Soar in Utah Amidst Pornhub Blockage
Utah's Google search volume for "VPN" is soaring following PornHub's decision to shut down access for the state in response to strict ID laws.
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Simple Precision Time Protocol at Meta
While deploying Precision Time Protocol (PTP) at Meta, we’ve developed a simplified version of the protocol (Simple Precision Time Protocol – SPTP), that can offer the same level of clock syn…
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Improving support for adult content on Mastodon
Using the Blurhash algorithm in Mastodon 2.8.1 to generate prettier previews for sensitive media