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IP addresses and routing
IP addresses & routing
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DNSFS – Store files in others' DNS resolver caches
A while ago I did a blog post about how long DNS resolvers hold results in cache for, using RIPE Atlas probes testing against their default resolvers (in a lot of cases, the DNS cache on their modem/router).
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Shortwave Trading: The West Chicago Tower Mystery
Since 2014 this blog has extensively covered the wireless networks built by high-frequency trading (HFT) firms or network providers to reduce latencies between the different exchanges around the wo…
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Using USB-VGA dongles as SDR transmitter
Yesterday, during OsmoDevCon 2018, Steve Markgraf released osmo-fl2k, a new Osmocom member project which enables the use of FL2000 USB-VGA adapters as ultra-low-cost SDR transmitters. How does it wor
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Google's CardDAV server isn't standards compliant (2014)
For fruux , we’ve decided to implement syncing with Google Contacts some time ago, allowing people to do bi-directional sync between their fruux and Google Contacts address book.
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Inside Firefox’s DNS-over-HTTPS engine
DNS over HTTPS (DOH) is a feature where a client shortcuts the standard native resolver and instead asks a dedicated DOH server to resolve names. Compared to regular unprotected DNS lookups done over UDP or TCP, DOH increases privacy, security and sometimes even performance. It also makes it easy to use a name server…
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Freeing the Web from the Browser
The Web is, without a doubt, the most powerful research tool currently available to man. No longer must researchers comb through endless indices and catalogues to find what they are looking for. Instead, hyperlinks allow users to associatively explore rich interconnected structures of information with ease. In just a…
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Paper review: IPFS – Content addressed, versioned, P2P file system
This week we discussed the IPFS whitepaper by Juan Benet in my Distributed Systems Seminar. Remember peer-to-peer systems? IPFS is "pe...
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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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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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Lying to TCP makes it a best-effort streaming protocol
In this All Things Linguistic post Gretchen and Lauren introduce a model dialogue:
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A Beginner's Guide to Firewalling with pf
This guide is written for the person very new to firewalling. Please realize that the sample firewall we build should not be considered appropriate for actual use. I just try to cover a few basics, that took me awhile to grasp from the better known (and more detailed) documentation referenced below
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Shortest bit sequence that's never been sent over the Internet (2017)
We can never know for sure because we don't have a comprehensive list of all the data. But what can we say probabilistically? Restating it like so:
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Mastodon and the challenges of abuse in a federated system
This post will probably only make sense to those deeply involved in Mastodon and the fediverse. So if that’s not your thing, or you’re not interested in issues…
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MPEG: A crisis, the causes and a solution
Why this post? Because there are rumours spreading about a presumed “MPEG-Video collapse” and Brownian motion-like initiatives trying to remedy – in some cases by the very people who have contributed to creating the “crisis”. Who is the author of this post? Leonardo Chiariglione, the founder and chairman of MPEG, but…
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Most use cases of ActivityPub would be better off as Atom or RSS feeds
Most use cases of ActivityPub would be better off as Atom or RSS feeds.
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The Power to Revoke Lies with the Certificate Authority
For those that read my blog often you may have seen me talk about EV certificates before. From a technical perspective there are many things that I don't agree with about EV certificates and from a non-technical perspective there are many things I don't like about the
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Usenet, authentication, and engineering: early design decisions for Usenet
A Twitter thread on trolls brought up mention of trolls on Usenet . The reason they were so hard to deal with, even then, has some lessons for today; besides, the history is interesting. (Aside: this is, I think, the first longish thing I’ve ever written about any of the early design decisions for Usenet. I should…
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Someone used my IPFS gateway for phishing
At 02:43 this morning, I received an abuse complaint email. It was sent by PhishLabs to DigitalOcean, and DigitalOcean forwarded it to me.
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Fixing bufferbloat on your home network with OpenBSD 6.2 or newer
My home network (which is also my work network) is a standard-issue Comcast cable hookup. In spite of a tolerable 120 megabits down, my experience of daily Internet use is regularly frustrating. Video streams and video chats drop in quality...