Initial public release: netswitch v1.0.0
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12
.gitignore
vendored
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.gitignore
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# Build output / staging
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*.exe
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portable-v*/
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# Local backup of release archives
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releases/
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# Editor / OS junk
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.vscode/
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.idea/
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.DS_Store
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Thumbs.db
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21
LICENSE
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LICENSE
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MIT License
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Copyright (c) 2026 engelgardt
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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48
README.md
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README.md
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# netswitch
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[](https://github.com/Engelgardt23/netswitch/releases/latest)
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[](LICENSE)
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A tiny portable tool to flip a Windows network adapter between a **static IP** and **DHCP** with a few keystrokes.
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Built for the recurring engineer chore of "give my laptop NIC 10.10.10.1 so I can talk to a server's BMC" and "now put it back on DHCP so I can have internet again."
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> **Made by engelgardt.**
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---
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## Download
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Grab the latest release: [**releases page**](https://github.com/Engelgardt23/netswitch/releases/latest).
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The asset is `netswitch-portable-vX.Y.Z.zip` (~30 KB).
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## Run
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1. Unzip anywhere.
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2. Double-click `netswitch.exe`.
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3. Accept the UAC prompt (admin is needed for `netsh interface ipv4 set address`).
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4. Pick the network adapter from the list.
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5. Choose mode:
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- **Static**: enter IP (default `10.10.10.1`), mask (default `255.255.255.0`), gateway (optional).
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- **DHCP**: just confirms — the NIC reverts to DHCP for both IP and DNS.
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## What it filters
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Only real, wired physical adapters appear in the picker. Wireless, VPN, virtual, Hyper-V, VMware, VirtualBox, TAP/TUN, WireGuard, OpenVPN, Tailscale, ZeroTier, Bluetooth, Loopback, WAN Miniport — all skipped.
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## Update check
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On every launch the tool calls GitHub's `/releases/latest` (3-second timeout). If a newer version is available, it prints a yellow notice and offers to open the download page in your browser. If you're offline, it stays silent.
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## Build from source
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The script is a single `netswitch.ps1`. To rebuild the bundled `.exe`:
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```
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Install-Module ps2exe -Scope CurrentUser
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Invoke-ps2exe -inputFile netswitch.ps1 -outputFile netswitch.exe -requireAdmin -title "netswitch" -version 1.0.0.0
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```
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## License
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MIT — see [LICENSE](LICENSE).
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143
netswitch.ps1
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143
netswitch.ps1
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# netswitch v1.0.0 - quick NIC IP / DHCP toggle
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# made by engelgardt
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$NetswitchVersion = '1.0.0'
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$GithubRepo = 'Engelgardt23/netswitch'
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$ErrorActionPreference = 'Stop'
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# --- Self-elevate if not admin (no-op when launched from the ps2exe build which already requests admin) ---
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$me = [Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()
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if (-not $me.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
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if ($PSCommandPath) {
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Start-Process -FilePath 'powershell.exe' `
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-ArgumentList @('-NoProfile','-ExecutionPolicy','Bypass','-File',"`"$PSCommandPath`"") `
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-Verb RunAs
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} else {
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Start-Process -FilePath ([System.Diagnostics.Process]::GetCurrentProcess().MainModule.FileName) -Verb RunAs
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}
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exit
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}
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# --- Banner ---
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Write-Host ""
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Write-Host "==============================================" -ForegroundColor Cyan
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Write-Host " netswitch v$NetswitchVersion - NIC IP/DHCP toggle" -ForegroundColor Cyan
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Write-Host " made by engelgardt" -ForegroundColor DarkCyan
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Write-Host "==============================================" -ForegroundColor Cyan
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Write-Host ""
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# --- Update check ---
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function Test-NetswitchUpdate {
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try {
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$url = "https://api.github.com/repos/$GithubRepo/releases/latest"
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$r = Invoke-RestMethod -Uri $url -TimeoutSec 3 -Headers @{ 'User-Agent' = "netswitch/$NetswitchVersion" }
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$latest = ($r.tag_name -as [string]) -replace '^v',''
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if (-not $latest) { return }
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$toTuple = { param($s)
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$parts = ($s -split '\.') | ForEach-Object {
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$n = 0; [void][int]::TryParse($_, [ref]$n); $n
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}
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while ($parts.Count -lt 3) { $parts += 0 }
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,$parts[0..2]
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}
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$L = & $toTuple $latest
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$C = & $toTuple $NetswitchVersion
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$isNewer = $false
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for ($i = 0; $i -lt 3; $i++) {
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if ($L[$i] -gt $C[$i]) { $isNewer = $true; break }
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if ($L[$i] -lt $C[$i]) { break }
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}
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if ($isNewer) {
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Write-Host "Update available: v$NetswitchVersion -> $($r.tag_name)" -ForegroundColor Yellow
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$ans = Read-Host "Open the download page in your browser? [Y/n]"
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if ($ans -notmatch '^(n|N|no|NO)$') {
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Start-Process $r.html_url
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}
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Write-Host ""
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}
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} catch {
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# silent on offline / API errors
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}
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}
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Test-NetswitchUpdate
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# --- Pick adapter (physical wired only) ---
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$skipDescriptionPattern = 'VPN|Virtual|AnyConnect|TAP-|TUN-|Bluetooth|Loopback|WAN Miniport|Hyper-V|VMware|VirtualBox|WireGuard|OpenVPN|Tailscale|ZeroTier'
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$skipMediaTypes = @('Native 802.11', 'Wireless WAN')
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$adapters = @(Get-NetAdapter | Where-Object {
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$_.Status -notin @('Disabled','Not Present') -and
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-not $_.Virtual -and
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$_.MediaType -notin $skipMediaTypes -and
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$_.InterfaceDescription -notmatch $skipDescriptionPattern -and
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$_.Name -notmatch $skipDescriptionPattern
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} | Sort-Object ifIndex)
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if ($adapters.Count -eq 0) {
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Write-Host "No physical wired adapters found." -ForegroundColor Red
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Read-Host "Press Enter to exit"; exit 1
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}
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Write-Host "Available adapters:"
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for ($i = 0; $i -lt $adapters.Count; $i++) {
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$a = $adapters[$i]
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$ips = (Get-NetIPAddress -InterfaceIndex $a.ifIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue |
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Where-Object { $_.PrefixOrigin -ne 'WellKnown' }).IPAddress -join ', '
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Write-Host (" {0}) [{1,-12}] {2} ({3}) {4}" -f ($i + 1), $a.Status, $a.Name, $a.InterfaceDescription, $ips)
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}
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do {
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$sel = (Read-Host "Select adapter number").Trim()
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$valid = ($sel -match '^\d+$') -and ([int]$sel -ge 1) -and ([int]$sel -le $adapters.Count)
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if (-not $valid) { Write-Host "Invalid selection." -ForegroundColor Red }
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} while (-not $valid)
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$nic = $adapters[[int]$sel - 1]
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Write-Host ""
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Write-Host "Selected: $($nic.Name)" -ForegroundColor Green
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# --- Mode ---
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Write-Host ""
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Write-Host "Mode:"
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Write-Host " 1) Static IP"
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Write-Host " 2) DHCP"
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$modeChoice = Read-Host "Choice [1]"
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if ([string]::IsNullOrWhiteSpace($modeChoice)) { $modeChoice = '1' }
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if ($modeChoice.Trim() -eq '2') {
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# --- DHCP ---
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Write-Host ""
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Write-Host "Setting $($nic.Name) to DHCP..." -ForegroundColor Yellow
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& netsh interface ipv4 set address name="$($nic.Name)" source=dhcp
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& netsh interface ipv4 set dnsservers name="$($nic.Name)" source=dhcp
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Write-Host "Done." -ForegroundColor Green
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}
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else {
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# --- Static ---
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$ip = Read-Host "IP address [10.10.10.1]"
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if ([string]::IsNullOrWhiteSpace($ip)) { $ip = '10.10.10.1' }
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$mask = Read-Host "Subnet mask [255.255.255.0]"
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if ([string]::IsNullOrWhiteSpace($mask)) { $mask = '255.255.255.0' }
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$gw = Read-Host "Gateway (Enter to skip)"
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Write-Host ""
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Write-Host "Setting $($nic.Name) -> $ip / $mask$( if ($gw) { " via $gw" })" -ForegroundColor Yellow
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if ([string]::IsNullOrWhiteSpace($gw)) {
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& netsh interface ipv4 set address name="$($nic.Name)" static $ip $mask
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} else {
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& netsh interface ipv4 set address name="$($nic.Name)" static $ip $mask $gw
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}
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Write-Host "Done." -ForegroundColor Green
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}
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# --- Show current state ---
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Write-Host ""
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Write-Host "Current IPv4 config:" -ForegroundColor Cyan
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Get-NetIPAddress -InterfaceIndex $nic.ifIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue |
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Where-Object { $_.PrefixOrigin -ne 'WellKnown' } |
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Format-Table IPAddress, PrefixLength, PrefixOrigin -AutoSize
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Read-Host "Press Enter to exit"
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