This is a transcript of my eponymous presentation at Confoo 2021.

Title slide

So, What is technical debt? And how do we talk about it?

We’ve all used that term: “technical debt”, “tech debt”, but has it been really useful? We keep struggling with maintenance, development hurdles, and lack of understanding of how our applications are even supposed to behave? Personally, I like my tools to be sharp, and, for me, a mere metaphor doesn’t cut it. So let’s get closer to the matter of the subject.

The metaphor

So first off, the term “technical debt” is a metaphor. It’s a figure of speech…

Network Mapper: Network exploration tool and security / port scanner


-Pn Skip discovery phase (treat all hosts as online)


-sS SYN scan

-sTfull TCP scan

-sV version scan


--script-help [default] print script’s info

--script run script

SANS nmap Cheatsheet v1.0

Arbitrary TCP and UDP connections and listens

Scan for listening daemon, without sending data

> nc -z 20-30
> nc -zv 20-30


> nc -l 1234 # server
> nc 1234 # client> nc -l 1234 > out.txt # server> nc 1234 < in.txt # clientGNU
> nc -lp 1234
BSD man page

Nearly every character in American Kingpin seems to have wandered in from one Coen brothers movie or another — Ulbricht’s girlfriend is a born-again Christian who runs an erotic photography business; one of his chief confidantes is an undercover DEA agent who begins stealing from him; and the man who discovers his true identity is a nerdy IRS agent who reads every sentence three times.


American Kingpin is written as a drama, but so many events in Ulbricht’s life read as farce. His over-the-top conversion to libertarianism; a disastrous early experience as a psychedelic mushroom farmer; his paying hundreds…

Inside the Hacker World of LulzSec, Anonymous, and the Global Cyber Insurgency


I (Parmy Olson) cover developments in AI, robotics, chatbots, digital assistants and emerging tech in Europe. I’ve spent close to a decade profiling the hackers and dreamers who are bringing the most cutting-edge technology into our lives, for better or worse. I’m the author of “We Are Anonymous: Inside the Hacker World of LulzSec, Anonymous and the Global Cyber Insurgency”, (Little Brown, 2012) which The New York Times called a “lively, startling book that reads as ‘The Social Network’ for group hackers.” Having worked out of Silicon Valley I’m now based in London and am obsessing over developments in AI…

César Hidalgo has a radical suggestion for fixing our broken political system: automate it! In this provocative talk, he outlines a bold idea to bypass politicians by empowering citizens to create personalized AI representatives that participate directly in democratic decisions. Explore a new way to make collective decisions and expand your understanding of democracy.

“Configuration guidelines for various technology groups to safeguard systems against today’s evolving cyber threats”

As I’m spinning up new machines and VMs, and at the recommendation of BHIS, I looking at the CIS Benchmarks.

Checkout my ongoing Ansible implementation:

A Dell PowerEdge R900

Got a used Dell PowerEdge R900 for $300. This beast comes with:

  • 4 Intel Xeon E7440 Quad Core 2.40Ghz with Intel virtualisation technology (VT-x)
  • 64Go RAM
  • 4 150Go 15K SAS hard drives

That makes it a good enough platform to build a virtual lab.

Dell PowerEdge R900

For the little story, R900 actually means something:

  • R means Rack-mountable server
  • 9 means 4 processors
  • 0 means 10th generation
  • 0 menas Intel CPUs

Cheap and powerful, but big and heavy, not your average tower.

Freaking loud fans


OSI Layer 1&2: Ethernet

Ethernet, with Wireless LAN, is part of the IEEE 802 family of standards.
The services and protocol specified in IEEE 802 map the physical layer and data link layer of the OSI model.

Ethernet is a family of networking technologies used for wired LAN and WAN networks.

An Ethernet packet (Layer 1) contains a Ethernet frame (Layer 2). An Ethernet frame is made of a MAC destination, a MAC source, a payload and a CRC error detecting code.

Ethernet was created for devices to communicate over a shared cable (think collision-prone radio systems). Since the communication happens on a same…

Book cover

Publisher description

“No single invention of the last half century has changed the way we live now as much as the Internet. Alexander Klimburg was a member of the generation for whom it was a utopian ideal turned reality: a place where ideas, information, and knowledge could be shared and new freedoms found and enjoyed. Two decades later, the future isn’t so bright any more: increasingly, the Internet is used as a weapon and a means of domination by states eager to exploit or curtail global connectivity in order to further their national interests.

Klimburg is a leading voice in the conversation…

Xavier Briand

50% solution finder at @ExperiencePoint / 50% endurance cyclist. Will train for food and burn it for adventures.

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