Dominick Krachtus

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Introducing the Cloudflare Onion Service

• <b>When</b>: a cold San Francisco summer afternoon• <b><br>Where</b>: Room 305, Cloudflare• <b><br>Who</b>: 2 from Cloudflare + 9 from Tor Project<p>What could go wrong?<p>Bit of Background<p>…

Onions

linuxify

README.md<p>Transparently transform the macOS CLI into a fresh GNU/Linux CLI experience by<p>installing missing GNU programs<br>• updating outdated GNU …

Linux

Learn k8s by doing.

<b>We believe it's time to evolve the</b> <b>Learning Medium</b> through which software engineers <b>grasp new technologies.</b> Leveraging the latest cloud and browser …

Anycast TCP

A computer accepting a TCP connection ordinarily randomizes its starting sequence number across the entire 32 bit space. Nodes in an anycast cluster …

Linux

Creating a bash completion script

I recently worked on creating a bash completion script for a project and I enjoyed it very much. In this post I will try to familiarize you with the …

Linux

Mac-like FreeBSD Laptop – MU Astronomy

This is a tour of my FreeBSD laptop. I’ve set a goal of configuring a Unix laptop with focused and efficient user interface, suitable for all sorts …

Linux

Virtual USB-disks

A VMware feature that I have missed since at least 10 years apparantly already exists sincequite a while.<br>See …

mkcert

README.md<p>mkcert is a simple tool for making locally-trusted development certificates. It requires no configuration.<p>Using certificates from real …

Kubernetes Traffic Engineering with BGP

Life of an Airline Flight: What Systems Get You From Here to There via the Air

Windows Command-Line: Inside the Windows Console

Welcome to the third post in the Windows Command-Line series. In this post, we'll start to dig into the internals of the Windows Console and …

macOS VPN architecture from System Preferences down to nesessionmanager

macOS 10.13 contains a built-in VPN client that natively supports L2TP over IPSec as well as IKEv2.<p>In this post I describe some parts of the internal …

Tip: Add Your Chrome or Firefox Activity to Timeline

Thanks to a third-party browser add-on, you can now add your Chrome and Firefox web browsing activity to your Timeline in Windows 10.The post Tip: …

How to port your OS to EC2

I've been the maintainer of the FreeBSD/EC2 platform for about 7.5 years now, and as far as "running things in virtual machines" goes, that remains …

The Fast Meme Transform: Convert Audio Into Linux Commands

Abstract<p>In recent years the meme economy has grown to have a significant influence on our everyday lives and culture. This influence has …

Timekeeping within ESXi

OverviewPrecise timekeeping is a key attribute for many types of applications. At a high level, it allows these applications to accurately construct …

Rosetta Stone for Unix

Derived from 4.4BSD-Lite and 386BSD. <i>This table does not include external packages from /usr/pkg.</i><p>Forked from NetBSD in 1995. Security emphasis. <i>This</i> …

How To Use Python To Automate Almost Anything

Testers of all kinds can benefit from learning approaches to automating daily tasks. In this three-part series, you’ll be walked through a task that …

How to drop 10 million packets per second

Internally our DDoS mitigation team is sometimes called "the packet droppers". When other teams build exciting products to do smart things with the …

It Was Raining in the Data Center

<b>Prineville, Oregon. 2011.</b><p>In August of 2011, Jay Parikh, the Vice President of Infrastructure Engineering at Facebook, received a call. As Parikh …

Virtualized High Performance Computing (HPC) Reference Architecture (Part 1 of 2)

Designing the characteristics of the HPC system for a virtual environment requires an understanding of how the architecture will be compared to that …

The Architecture of Mailinator

Almost 3.5 years ago I started the Mailinator(tm) service. I got the bulk of the idea from my drunk roommate at the time and the first incarnation …

Attacking Private Networks from the Internet with DNS Rebinding

TL;DR Following the wrong link could allow remote attackers to control your WiFi router, Google Home, Roku, Sonos speakers, home thermostats and more.<p>…

VCAP6-DCV Deployment Exam Simulator

Preparing to take the VCAP6-DCV deployment exam? Before you do, check out this exam simulator via @RicardoConzatti: https://t.co/KMORRebJ4V …

Vmware

Anatomy of a Linux DNS Lookup – Part II

In Anatomy of a Linux DNS Lookup – Part I I covered:• nsswitch<br>• /etc/hosts<br>• /etc/resolv.conf<br>• ping vs host style lookups<br>and determined that most programs …

How To Handle Plain Text Files in Python 3

IntroductionPython is a great tool for processing data. It is likely that any program you write will involve reading, writing, or manipulating data. …

Let's code a TCP/IP stack, 1: Ethernet ARP

Writing your own TCP/IP stack may seem like a daunting task. Indeed, TCP has accumulated many specifications over its lifetime of more than thirty …

Networking

F*EX - File EXchange

<i>Why do I need another service for file transfer?!<br>I have e-mail, ftp, ssh and even sendfile!</i><p><i>You still need F*EX ☺</i><p>sending a DVD by postal service<p>Out of …

E-Mail

The Open Home Lab Stack

This is an article I’ve put together to create an Open source Home Network stack using various technologies which are mostly free however all have …

Linux

Playing battleships over BGP

May 21 2018<p>Playing battleships over BGP<p>BGP is the glue of the internet. For a protocol that was produced on two napkins in 1989 it is both amazing …

Routers