Dan's notes (Page 4)

More issues

2.5 Gigabit ethernet

I've been wanting to upgrade my home network for a few years now. My home server/NAS can easily fill 1 gigabit, but I also didn't want to spend a lot of money on the upgrade. $ sudo hdparm -t /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/

Database substring indexes

Goals Imagine you have an application that keeps track of domain names. And this application has millions of entries in a MySQL database. How do you efficiently find all domain names that have part of a word inside of them? This article assumes some understanding of how SQL queries work.

Kerberos for Windows, without AD

Continuing from the previous post [https://blog.dan.drown.org/kerberos-configuration/], let's see what Windows can do with a MIT Kerberos based realm. Windows normally uses Kerberos as part of Active Directory, but it does have some basic support for a non-AD version of Kerberos. I'll

SSH single-sign on

I was looking for a way to deal with ssh/sudo authentication between multiple clients and multiple devices. I wanted something with a balance between convenience and security.

Mounting a dedicated disk in WSL2

In WSL2, the default disks are virtual. Microsoft has recently added support for mapping physical disks to your WSL2 VM. I was running low on space my C: drive, so I wanted to move some of my WSL2 data to a dedicated Linux drive.

Bluetooth Low Energy sensor, part 2

To continue from part 1 [https://blog.dan.drown.org/bluetooth-low-energy-sensor/]: I want a wireless sensor that will last more than a month on 2x rechargeable AA or AAA batteries. Some ideas I have for what I could do with such a sensor: * indoor/outdoor temperature/humidity sensor * garage door

Bluetooth Low Energy sensor

I have some ideas for a low power wireless sensor. I want something that will last more than a month on 2x rechargeable AA or AAA batteries. I first tried an esp8266 and then an esp32, but the boards I have all use 3-7mA in "deep sleep". This

Replacing the WSL Kernel

This information is a few years out of date, see the readme at https://github.com/microsoft/WSL2-Linux-Kernel Backstory I had a dual boot Windows/Fedora machine, and I wanted to be able to run the Fedora install as a VM inside WSL. To do this, I needed the physical

Teensy 4.1 ethernet

I'm a fan of the Teensy [https://www.pjrc.com/teensy/] line of microcontrollers. I have a whole pile of them for various projects. When I saw that 4.1 was combining a 600MHz processor, 1MB ram, 8MB flash, and ethernet with ieee1588/ptp, I was excited. The

Embedded NTP Server

Now that I got the results I wanted from my embedded NTP client [https://blog.dan.drown.org/embedded-ntp-client-ntp-interleaved-mode-part-5/], I wanted to convert it to an NTP server. I also wanted it to support interleaved NTP [https://tools.ietf.org/html/draft-ietf-ntp-interleaved-modes-03] mode, so it could have hardware timestamps for