radhitya.org

What I Have Learned From Writing My Own Dns Resolver

Fri, 19 Jun 2026 14:50:53 +0700

I bet you have asked yourself: “how does dns work?”.

What is DNS

DNS stands for Domain Name System and how it works is like a phonebook: There are owner’s name and number that equivalents to domain’s name and ip addresses. It is the successor to the old hosts.txt file used in the early days of ARPANET. The difference between hosts.txt and DNS is architecture.

Old days with hosts.txt probably sucked due to centralization. You had to contact the operator to make a change or get the latest update. But, those problems are no longer an issue again for now.

To Keep Simple

Wed, 25 Feb 2026 04:51:40 +0700

january. i signed up formany subscriptions: three servers and two additional domains, apple music, and chatgpt go. it was fun to be honest like my inner child was fulfilled. what i had been dreaming of had finally come true.

but, unfortunetaly, the fun only appeared the beginning. the rest did not.

although i had a budget for that, keeping them would be wasteful. why? because i did not optimize them; for instance, one server was only used for a single purpose. besides, managing so many servers was overwhelming. at some point, i just got tired.

Modern Website Sucks

Sun, 02 Nov 2025 08:12:37 +0700

discovering new website is my hobby, instead of scrolling on media social. i enjoy finding a new inspiration, whether it’s in layout, information, and many more. but, honestly, many of website i discover end up dissapointing me.

i think we all know about this one. ads have become a serious problem. imagine trying to read something while an ad blocks part of the content and it completely ruins the experience.

Arduino: Self Restart Through Code

Sun, 25 May 2025 16:20:20 +0700

recently i got an arduino project to prove my worth as a micro-controller laboratory assistant.

however, at the time, when i was trying to use the sensor, suddenly my arduino became unresponsive because the sensor was producing a negative output.

the best way to escape from the problem is to restart the device by itself. luckily, someone had added the function from assembly instruction inside the watchdog library.

the functions are wdt_disable and wdt_enable which you can use both like this:

ESP-IDF: General Purpose Input Output ESP32 (Buzzer)

Fri, 28 Feb 2025 00:00:00 +0000

Two weeks ago, i discovered about ESP-IDF, the official framework for ESP32 and ESP8266 Microcontroller development.

Developing for the ESP32 with ESP-IDF offers many features:

Support for FreeRTOS
Writing program in the C language
More low level of control, memory management, and hardware options

Write a Code in ESP-IDF

The workflow between Arduino and ESP-IDF is different, but you dont have to worry because i dont think it will be a big problem.

The Joy of Using Unix-Like Systems

Sat, 18 Jan 2025 00:00:00 +0000

This year marks five years since I started using Linux and I’m still enjoying it on my device(s). Most of my devices are installed with Unix-like systems (Linux and OpenBSD) for various tasks.

Sadly, I’m still keeping Windows on another partition due to college requirements. Before I started my college studies, I was fully running Linux.

Mostly, people ask me about my decision to run Linux while others are using a ’normal’ setup. Not infrequently, some of them also comment in a trivial tone because of the ‘complicated’ nature of my Linux setup.

Cloudflare Tunnel Gotosocial

Tue, 10 Dec 2024 20:24:11 +0700

Now, we can expose our localhost service to the public without a public IP or router setting with Cloudflare Zero Trust and it’s completely free. You need a credit card for registration.

I’m not explaining how to register zero trust, and you can read the documentation on the Cloudflare website.

Cloudflared

We need CloudFlared, a lightweight server-side daemon, to connect a tunnel between the localhost and the CloudFlare server. You can download it as a Debian package, RPM, Docker, Mac, or Windows. Also, it has different architectures, like 64-bit, 32-bit, arm64-bit, and arm32-bit.

On Self Hosting

Tue, 10 Dec 2024 20:21:24 +0700

You might only know how to use application, but dont know how to be provide. I asked to some of my friend and most of them only know how to use apps without understanding how they works

Self-hosting is the activity of running and maintaining a service with our control. When you self-host a service, you understand how the applications works behind the scenes, control the data, and ensure privacy.