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Reasons to not use your own domain for email
Reasons to not use your own domain for email on Eduardo Bautista's blog.
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International domain names: where does https://meßagefactory.ca lead you?
Originally, the domain part of a web address was all ASCII (so no accents, no emojis, no Chinese characters). This was extended a long time ago thanks to something called internationalized domain name (IDN). Today, in theory, you can use any Unicode character you like as part of a domain name, including emojis…
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Sinkholed: A DNS Horror Story (2019)
On 26 Nov 2019 at 14:55 UTC, I logged into my server that hosts my website to perform a simple maintenance activity. Merely three minutes later, at 14:58 UTC, the domain name susam.in used to host this website was transferred to another registrant without any authorisation by me or without any notification sent to me…
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Finding services companies via their TXT records
How to use a company's TXT records to discover the products they use.
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Homelab analog telephone exchange
An introduction to my MCU based fully featured analog telephone exchange, how I mounted it in my home lab powered with batteries for months of use
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Nuvem, a subsea cable to connect Portugal, Bermuda, and the U.S.
The Nuvem submarine cable will connect Portugal, Bermuda and South Carolina, and will be Bermuda’s first transatlantic fiber optic route.
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Vodafone unveils prototype 5G network built on a Raspberry Pi computer
Vodafone today unveiled a prototype 5G network built on a credit card sized Raspberry Pi personal computer and an equally small, advanced silicon chipset. This industry-first concept will enable small businesses and households to extend 5G coverage and increase capacity according to their needs and to have their very…
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Arxiv.org is experiencing a DDoS attack
arXiv users may be experiencing email disruption due to a DDOS attack. Over the past few days, a small number of users issued over a million email change…
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Automating heating with Home Assistant
I’ve been on a mission to use Home Assistant to optimize my home heating, with the dual goals of reducing gas usage and increasing comfort. It’s worked out…
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Testing if a port can be reached, using built-in tools other than ol' telnet
Charlie Arehart - Server Troubleshooting - Testing if a port can be reached, using built-in tools other than 'good old telnet'
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Activity Pub vs. Web Frameworks
Personal site and blog
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VyOS From Scratch – Edition 1 (set up your own router)
As a VyOS evangelist, maintainer, and more, I’ve been meaning to write a simple series of “how-to” guides for VyOS for a while. Sure, there are plenty of guides out there, but I think a lot of them fall short in demonstrating WHY you are entering specific commands.
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Would we still create Nebula today?
Spoiler: Yes. (But the "why" matters. A lot.)
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Globally Distributed Elixir over Tailscale
The result of my exploration of Elixir clustering and automating global network discovery and connection over Tailscale.
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Computer Networking Introduction: Ethernet and IP – Heavily Illustrated (2021)
What is a LAN? What is a network segment? How are L1, L2, and L3 segments related? What does it take to send an IP packet from one host to another? What is the difference between LAN, VLAN, and VXLAN?
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The Backbone: A History of the Internet
This page provides a single entry point to all the posts in the story of how the world got online. Now available as a book, buy here. The Backbone: Introduction One System, Universal Service? The U…
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An underwater landslide knocked out two critical submarine cables serving Africa
On Sunday, August 6, an undersea landslide in one of the world’s longest submarine canyons knocked out two of the most important submarine cables serving the African internet. The loss of these cables knocked out international internet bandwidth along the west coast of Africa. In this blog post, we review some history…
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Usenet over NNCP
Usenet, of course, originally ran over UUCP in quite a few cases. Since NNCP is quite similar to UUCP – in fact, you can map UUCP commands to NNCP ones – it is quite possible, and not all that hard, to run Usenet over NNCP. In fact, in a number of ways, it works better than Usenet over UUCP! Introduction to NNCP…
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macOS 14 Sonoma firewall bug fixed
The firewall bug in macOS 14 Sonoma betas and release candidates that we blogged about last week has been fixed by Apple.
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Calling time on DNSSEC: The costs exceed the benefits
I’m calling time on DNSSEC. Last week, prompted by a change in my DNS hosting setup, I began removing it from the few personal zones I had signed. Then this Monday the .nz ccTLD experienced a multi-day availability incident triggered by the annual DNSSEC key rotation process. This incident broke several of my unsigned…
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It's not always DNS, unless it is
Our journey investigating a months-long issue and what we learned from it
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Messaging layer security: Secure and usable end-to-end encryption
The IETF has approved publication of Messaging Layer Security (MLS), a new standard for end-to-end security that will make it easy for apps to provide the highest level of security to their users. End-to-end encryption is an increasingly important security feature in Internet applications. It keeps users’ information…
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All IP addresses are equal? “Dot-zero” addresses are less equal (2013)
In theory, all IP addresses are the same, and you can allocate them at random without a problem. 192.168.1.2 is certainly not better or worse than 192.168.1.15, right? But, in practice, certain IP addresses are regarded as "special" by some implementations and do not yield the same user experience.…
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A Quick Guide to Mutt
Mutt is not that difficult to get up and running, however, sometimes finding the proper information can be a bit difficult. It is hoped that this guide will get you started, and show you some nice enhancements that help to make mutt (and neomutt) so popular.
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RCE on MikroTik routers with IPv6 RA enabled
MikroTik makes networking hardware and software, which is used in nearly all countries of the world. Our mission is to make existing Internet technologies faster, more powerful and affordable to wider range of users.
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UDP transmitter implemented with PIO and DMA on the RP2040
The objective for this project was to implement a UDP transmitter for use on the RP2040 that would consume zero CPU time. The system described on this webpage is implemented with 3 PIO state machines, 12 DMA channels, and 1 PWM channel. It generates an NLP, performs packet checksum calculations, and performs packet…
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RFC 9518 – What can internet standards do about centralisation?
RFC 9518: Centralization, Decentralization, and Internet Standards has been published after more than two years of review, discussion, and revision.