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Table of contents: Food, nutrition, science, health, Startup, business related, Publications, Presentations, Random, Cryptography, Food, Programming, Software, Friends & family pages.

Food, nutrition, science, health

• Honouring David MacKay's contribution to the future of energy: "being pro-arithmetic" (new!)
• A "brief" introduction to the human metabolism
• DNA seen through the eyes of a coder
• Needleman-Wunsch alignment demo in Javascript
• Antonie - an integrated, robust, reliable and fast processor of DNA reads, mostly from Next Generation Sequencing platforms. It is currently focused on prokaryotic and other small genomes.
• On how to average Sanger Q Scores in DNA Sequencing
• Some notes on how to upload FASTQ to the European Nucleotide Archive
• Hello, and welcome to the wonderful world of DNA sequencing
• The biggest bet of your life, more on nutrution & health
• Towards a new nutritional consensus, plus the people working on it

• How about some actual innovation: Inventing the transistor and landing a nuclear robot on Mars (new!)
• Tin cans, can openers and solar power: explaining the snail’s pace of innovation
• Will your startup idea be successful? I don’t know. But here’s a checklist before you approach people who could help you.
• Being a sophisticated & credible customer, and how to deal with one that isn't
• Small collection of links that helped shape my thinking on how to do business
• Interview from book 'De natuurkundige ondernemer' by Kees van den Bos and Witek Nawara (Dutch)

• Felix Hol, Bert Hubert, Cees Dekker, Juan Keymer. Density-dependent adaptive resistance allows swimming bacteria to colonize an antibiotic gradient. The ISME Journal

• 2016
  • 20th of May, 'Yes!Delft' 1•2•Startup, Delft University of Technology, 'Marketing, Market research, Market trends'. Slides, mostly good audio.
  • 21st of April, 'dnsdist: DNS, latency and DoS-aware load balancing', UKNOF 34, Manchester. Slides, Video version 1, version 2
  • 21st of April, 'Implementing "safe browsing" cost effectively using open source DNS', UKNOF 34, Manchester. Slides, Video version 1, version 2.
  • 15th of March, 'Three Building Blocks for Trusted Internet Services: Openness, Privacy and Security', World Hosting Days, Rust, Germany
• 2015
  • 19th of November, 'dnsdist - DNS, latency and DoS-aware load balancing', NLUUG conference.
  • 12th of November, 'Using DNS for fun and profit', Black Hat Europe 2015, Dark Reading Presentations, Amsterdam
  • 4th of November, Startup Grind Rotterdam, on business, startups and innovation
  • 8th of October, 'DNS Matters - Why Subscribers are leaving You: Not Measuring your Customer Experience (video)', Open-Xchange Summit 2015, Berlin
  • 18th of September, 'Escaping the data center - tales from a recovering manager', NLNOG Day 2015. Video, slides
  • 7th of June, 'Startups and -downs', Yes!Delft Students 1.2.Startup weekend
  • 5th of June, Applied Sciences, Delft University of Technology - Programming workshop for physics students: skipping the first 20 years
  • 3rd of June, TN1661-BN 'Orientation to Physics Research', TU Delft, "How industry looks at physics and bionano students"
  • 10th of May, DNS-OARC Spring 2015, Amsterdam - dnsdist - DNS, latency and DoS-aware load balancing. Video.
• 2014
  • 23rd of June, ICANN50, London - PowerDNS in 2014 - DNS round table
  • 18th of June, Applied Sciences, Delft University of Technology - Programming workshop for physics students: skipping the first 20 years
  • 15th of June, Yes!Delft, 1•2•Startup closing speech, presentation available on request
  • 4th of June, Applied Sciences, Delft University of Technology - Computer Programming & Physics
• 2013
  • 2nd of August, OHM2013 conference, "Feed the hacker, hack the business! Or, how to make money with open source"
  • 31st of July, OHM2013 conference, "What you need to know about what you eat: health & weight"
  • June, "How to give a good presentation for hackers, engineers, geeks & scientists", includes video
  • 15th of May, RIPE66, Dublin, Ireland. “Implementing Full IPv6 Support: More than Binding to an AF_INET6 Socket”, Video! (Update: but also see A surprising discovery on converting IPv6 addresses: we no longer prefer getaddrinfo())
  • 22nd of March, Fox-IT. Eten, hoe werkt het & hoe beïnvloedt het mijn gezondheid. Video
• 2012
  • 29th of November, SIDN Relatiedag 2012. Van 27 tot 1.342.465 domeinnamen met DNSSEC in Nederland: hoe dat komt en wat hebben we geleerd
  • 20th of November, Dutch Police / Netherlands Forensic Institute Conference. Presentation available on request
  • 23rd of October, Swedish Internet Days, PowerDNS Large Scale DNSSEC Deployments
  • 25th of September, DENIC Internet Days, PowerDNS Large Scale DNSSEC Deployments
  • 27th of June, ICANN44 in Prague, 'DNSSEC & PowerDNS Large Scale DNSSEC Deployments' (includes audio)
  • 14th of June, VvTP, Physics student body of Delft University of Technology, 'From engineer to entrepreneur, or, "I mastered Quantum Mechanics, but do I have what it takes to start my own company?"'
  • 25th of May, Thalia, Computer Science student body of Radboud University, 'Modern operating systems'. How we lost the trusted computing base
  • 4th of April, Madison Gurkha, Black Hat Sessions Anniversary Edition, On the end of secure computing on general purpose hardware. Partial movie can be found on YouTube.
• 2011
  • 15th of November, Govcert cybersecurity congress, "DNSSEC: Reality & Utility - what problems does it solve today"
  • 8th of June, World IPv6 day Amsterdam, "Security Aspects of IPv6"
  • 27th of May, Eindhoven University, Keynote of the Symposium 50 years of Mathematics & Computer Science, "Science in Software innovation"
  • 20th of May, Hack In The Box, "DNSSEC the good, the bad and the ugly"
  • 19th of May, SIDN Relatiedag, "DNSSEC zonder (al) te veel moeite", in Dutch, includes video recording
• 2010
  • 4th of February, Surfcert/Surfnet Security Conference, on DNS security
• 2009
  • 14th of August, Hacking at Random, "DNS Security in the Broadest sense"
• 2007
  • ISOC.NL: The Future of VoIP, "DNS as a carrier of ENUM and other VoIP routing information"
• 2006
  • 5th of October, RIPE-53, Amsterdam, "Progress report on the PowerDNS Recursor"
• 2005
  • 28th of September, DENIC Technical Meeting, "All about the PowerDNS Nameserver"
  • Ottawa Linux Symposium, "On faster application startup times: Cache stuffing, seek profiling and adaptive preloading"
• 2003
  • 5th of September, Swiss Unix Conference, "Quality of Service under Linux: Theory and Use"
• 2002
  • Ottawa Linux Symposium, "Traffic Control for the User and Developer"
• 2001
  • Linux Kongress 2001, "on CBQ/HTB"

• HOWTO give a good technical presentation to technical people
• Thoughts on the (non-)utility of DNSSEC
• Explanation of DNSSEC-bis, thoughts on its (non-)utility
• Oldest proof of me on the internet (1992)

• Secrets in Public: Diffie-Hellman key exchange
• On Secure Remote Password, password authenticated key exchange.
• Bitcoins explained for normal people -or- please get back to work

• HOWTO make a decent pizza
• HOWTO make 'Hmmm, lekker' (in dutch)
• Indiaas eten koken (dutch!)

• The perfect error message - required reading for programmers
• How to make your DocBook HTML output pretty.
• How to talk to an open source project as a large scale or otherwise interesting user
• Help, my sin() is slow and my FPU is inaccurate
• C++ books I recommend (37000 views so far!)
• PowerDNS.com, my big open source project.
• Some notes on floating point programming with UNIX and Linux
• HOWTO use SIMD (SSE, SSE2, SSE3, 3DNow!, MMX) instructions with gcc.
• Linux 2.4 Advanced Routing & Traffic Shaping HOWTO
• Getting Linux 2.6 to work on a Dell Latitude D800
• Dreambox satellite receiver, some perhaps useful remarks
• Futex manpages I authored (with help from Rusty). Futexes are high performance locking primitives in the 2.6 kernel.
• How to get the linenumber from a linux kernel oops
• Linux Logical Volume Management HOWTO (unmaintained)
• Lex & YACC HOWTO
• Some evil ideas about decentralised loadbalancing/clustering, with no single point of failure
• Beginnings of an rrdtool HOWTO (unfinished, but perhaps useful)
• At one point, I got all fired up about synchronous webservices

• dnsdist - a highly DNS-, DoS- and abuse-aware loadbalancer. Its goal in life is to route traffic to the best server, delivering top performance to legitimate users while shunting or blocking abusive traffic.
• Weakforced - The goal of 'wforced' is to detect brute forcing of passwords across many servers, services and instances, all with flexible policies to support the real world.
• Splitpipe, a tool to spread the output of, say, tar over multiple volumes (DVDs, CDs, hard disks etc).
• Tool to display your logical volumes (unmaintained)
• Tool to display 'cachedness' of files: cinfo. FreeBSD, recent OpenBSD, Linux, Solaris
• The Wonder Shaper for lag-less uploading & downloading over ADSL/Cablemodem
• PowerDNS nameserver
• PowerMail mail receiver & popserver
• MTasker, very simple cooperative multitasking in C++ for people, like me, who are not smart enough for state machines
• vmloader, tool to load a virtual memory system in various ways and report stats. Unmaintained, but might be useful

• Bertus Beaumont Lab, "We seek insight into the mechanisms behind the creative potential of biological evolution (from molecules to ecology) with a particular focus on the cell's protein nano-machines".
• "Dit jaar wel": Studiebegeleiding, afstudeerbegeleiding by my lovely wife Mirjam
• Jasper Spaans
• Con Kolivas' Anaesthesia Information Page - the medical specialist with his own kernel patch set