Archives for My Lazy and Forgetful Mind

How to Make Vite Build Work on Filament Page

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Repair Git Broken Object / EntryNotFound (WSL / VS Code)

Contents1 ✅ Repair Git Broken Object / EntryNotFound (WSL / VS Code)1.1 1️⃣ Backup working tree1.2 2️⃣ Fetch remote state1.3 3️⃣ Create clean branch from remote1.4 4️⃣ Restore file content from broken branch1.5 5️⃣ Rebuild objects1.6 6️⃣ Replace broken main1.7 7️⃣ Cleanup dangling / corrupted objects1.8 8️⃣ Verify1.9 9️⃣ Push2 ✅ What you learned (important)3 […]

Setting Persistent IPv4 DNS for Ubuntu 20.xx

Contents1 Prefer IPv4 for DNS & Connections on Ubuntu (Keep IPv6 Enabled)1.1 🎯 Goal1.2 1) Set IPv4 DNS with systemd-resolved1.3 2) Prefer IPv4 over IPv6 for connections1.4 3) Test1.5 ✅ Result1.6 🧠 Notes1.7 🔁 Revert Prefer IPv4 for DNS & Connections on Ubuntu (Keep IPv6 Enabled) On Ubuntu 20.04+, systemd-resolved and the network stack prefer […]

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Contents1 Fixing Expo + npm ERR_INVALID_URL and Permission Issues on WSL1.0.1 Problem Summary1.0.2 Fix Instructions1.0.2.1 1. Use WSL Terminal1.0.2.2 2. Ensure Node and npm are Linux-native1.0.2.3 3. Keep project inside WSL filesystem1.0.2.4 4. Fix missing executable permission1.0.2.5 5. Clean reinstall deps1.0.2.6 6. Run Expo1.0.3 Notes Fixing Expo + npm ERR_INVALID_URL and Permission Issues on WSL […]

Filament and vite integration

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Contents1 Running Qwen Code in a Sidecar Docker Container1.1 1. Why Sidecar?1.2 2. Dockerfile1.3 3. docker-compose.yml1.4 4. Environment Variables1.5 5. Wrapper Script1.6 6. Usage1.7 7. Notes Running Qwen Code in a Sidecar Docker Container 1. Why Sidecar? Instead of installing Qwen Code on your host, you can run it in its own container. Keeps API […]

Camouflaging MikroTik from ISP

Contents1 Camouflaging MikroTik from ISP1.1 Goal1.2 Firewall Rule1.3 Randomization Script1.4 Scheduler1.5 Behavior Camouflaging MikroTik from ISP Goal Reduce ISP visibility that the connected device is a MikroTik by masking: System identity DHCP client hostname WAN (ether1) MAC address Blocking management ports on WAN Firewall Rule Drop MikroTik management ports from WAN (ether1): /ip firewall filter […]

Batch resize image on windows 11 using powershell

This script below work as resize all image with jpg, jpeg, JPG, JPEG extension inside folder and subfolder save the result into 'web' folder at same folder as this script make file with ps1 extension Add-Type -AssemblyName System.Drawing $w = 300 $h = 400 $quality = 70 # JPEG quality 0–100 $root = Get-Location $outDir […]

iPerf3 on Windows 11 with Docker

# iPerf3 on Windows 11 with Docker This guide explains how to install Docker Desktop on Windows 11, run iPerf3 for network performance testing, and use a single .bat script for quick local, remote, and dual-direction tests. --- ## 1. Install Docker Desktop 1. Download Docker Desktop: - [https://www.docker.com/products/docker-desktop/](https://www.docker.com/products/docker-desktop/) 2. Install it with **WSL 2 […]

Setting Persistent IPv4 DNS for Ubuntu 20.xx

23 January 2026 / by akozan / 0 Comments

Contents

1 Prefer IPv4 for DNS & Connections on Ubuntu (Keep IPv6 Enabled)

Prefer IPv4 for DNS & Connections on Ubuntu (Keep IPv6 Enabled)

On Ubuntu 20.04+, systemd-resolved and the network stack prefer IPv6 when it’s available.
Even if you set IPv4 DNS, connections may still use IPv6 (AAAA records).

This guide keeps IPv6 enabled, but makes Ubuntu prefer IPv4 for DNS and connections.

🎯 Goal

Keep IPv6 available
Use IPv4 DNS servers
Prefer IPv4 for outbound connections

1) Set IPv4 DNS with systemd-resolved

Edit config:

sudo nano /etc/systemd/resolved.conf

Set:

[Resolve]
DNS=8.8.8.8 1.1.1.1
FallbackDNS=8.8.4.4

Restart:

sudo systemctl restart systemd-resolved

Verify:

resolvectl status

You should see:

DNS Servers: 8.8.8.8
             1.1.1.1

2) Prefer IPv4 over IPv6 for connections

Ubuntu still prefers IPv6 for connections unless changed.

Edit:

sudo nano /etc/gai.conf

Find and uncomment:

precedence ::ffff:0:0/96  100

This tells the OS to prefer IPv4-mapped addresses over IPv6.

3) Test

ping google.com

Before:

PING ... (2404:xxxx::xxxx)

After:

PING ... (142.xxx.xxx.xxx)

Check resolution:

resolvectl query google.com

✅ Result

IPv6 still enabled
DNS uses IPv4 servers
Connections prefer IPv4
No need to disable IPv6

🧠 Notes

DNS config controls servers.
gai.conf controls IP selection order.
Without gai.conf, Ubuntu prefers IPv6 even with IPv4 DNS.

🔁 Revert

Comment again in /etc/gai.conf:

# precedence ::ffff:0:0/96  100