Basically I got tired of restarting manually the Network in order to have my Linux Distros running properly under Windows 11 as WSL. I think I'm not the only one with the same situation, so, here is the script, enjoy!

Restart-WSL-Network.ps1

# ==============================================================================
#  Restart-WSL-Network.ps1
#  Restarts the Hyper-V virtual network adapter used by WSL2.
#  Fixes: DNS resolution failures, "Temporary failure in name resolution",
#         and general network connectivity issues inside WSL2.
#
#  Usage:
#    Right-click > "Run with PowerShell" (as Administrator)
#    -- or --
#    PowerShell (Admin): .\Restart-WSL-Network.ps1
#
#  License: MIT
# ==============================================================================

#Requires -RunAsAdministrator

$ErrorActionPreference = "Stop"

# ---------------------------------------------------------------------------- #
# Helpers
# ---------------------------------------------------------------------------- #

function Write-Header {
    Write-Host ""
    Write-Host "  +--------------------------------------+" -ForegroundColor Cyan
    Write-Host "  |      WSL2 Network Reset Utility      |" -ForegroundColor Cyan
    Write-Host "  +--------------------------------------+" -ForegroundColor Cyan
    Write-Host ""
}

function Write-Step([string]$msg) {
    Write-Host "  >> " -NoNewline -ForegroundColor Yellow
    Write-Host $msg
}

function Write-Success([string]$msg) {
    Write-Host "  OK " -NoNewline -ForegroundColor Green
    Write-Host $msg
}

function Write-Failure([string]$msg) {
    Write-Host "  !! " -NoNewline -ForegroundColor Red
    Write-Host $msg
}

function Write-Info([string]$msg) {
    Write-Host "  -- " -NoNewline -ForegroundColor Gray
    Write-Host $msg -ForegroundColor Gray
}

# ---------------------------------------------------------------------------- #
# Main
# ---------------------------------------------------------------------------- #

Write-Header

# 1. Find the WSL Hyper-V adapter
Write-Step "Searching for WSL Hyper-V network adapter..."

$adapter = Get-NetAdapter | Where-Object { $_.Name -like "*WSL*" } | Select-Object -First 1

if (-not $adapter) {
    Write-Failure "No WSL adapter found. Is WSL2 installed?"
    Write-Info "Run 'wsl --install' and try again."
    exit 1
}

Write-Success "Found adapter: '$($adapter.Name)' -- Status: $($adapter.Status)"
Write-Host ""

# 2. Shut down all WSL instances
Write-Step "Shutting down all WSL2 instances..."
try {
    wsl --shutdown
    Write-Success "WSL2 shut down."
} catch {
    Write-Failure "Could not shut down WSL2: $_"
    exit 1
}
Start-Sleep -Seconds 2

# 3. Disable the adapter
Write-Step "Disabling adapter '$($adapter.Name)'..."
try {
    Disable-NetAdapter -Name $adapter.Name -Confirm:$false
    Start-Sleep -Seconds 3
    Write-Success "Adapter disabled."
} catch {
    Write-Failure "Failed to disable adapter: $_"
    exit 1
}

# 4. Re-enable the adapter
Write-Step "Re-enabling adapter '$($adapter.Name)'..."
try {
    Enable-NetAdapter -Name $adapter.Name
    Start-Sleep -Seconds 3
    Write-Success "Adapter re-enabled."
} catch {
    Write-Failure "Failed to re-enable adapter: $_"
    exit 1
}

# 5. Verify adapter is back up
$updatedAdapter = Get-NetAdapter -Name $adapter.Name
if ($updatedAdapter.Status -eq "Up") {
    Write-Success "Adapter is Up and running."
} else {
    Write-Failure "Adapter status is '$($updatedAdapter.Status)'. You may need to reboot."
}

# 6. Done
Write-Host ""
Write-Host "  ============================================" -ForegroundColor Cyan
Write-Host "  Done! Now open WSL and test:" -ForegroundColor White
Write-Host "    ping -c 3 8.8.8.8" -ForegroundColor Yellow
Write-Host "    ping -c 3 google.com" -ForegroundColor Yellow
Write-Host ""
Write-Info "If DNS still fails inside WSL, run:"
Write-Info "  sudo chattr -i /etc/resolv.conf 2>/dev/null"
Write-Info "  echo -e 'nameserver 8.8.8.8\nnameserver 8.8.4.4' | sudo tee /etc/resolv.conf"
Write-Info "  sudo chattr +i /etc/resolv.conf"
Write-Host "  ============================================" -ForegroundColor Cyan
Write-Host ""
Write-Host "Powered by @fredyfx - https://github.com/fredyfx" -ForegroundColor Green

pause