Menu based PowerShell script to change DNS servers for local area connections

ChangeDNSServerSettings.ps1

#
# Menu based Powershell script to change DNS servers for local area connections.
#

$DNSServer = @{"Home1" = "192.168.2.2";
  "Home2"              = "192.168.2.10";
  "Home3"              = "192.168.2.1";
  "OpenDNS1"           = "208.67.220.220";
  "OpenDNS2"           = "208.67.222.222";
  "Google1"            = "8.8.8.8";
  "Google2"            = "8.8.4.4"
}

function Use-RunAs {    
  # Check if script is running as Adminstrator and if not use RunAs 
  # Use Check Switch to check if admin 
     
  param([Switch]$Check) 
     
  $IsAdmin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator") 
         
  if ($Check) { return $IsAdmin }     
 
  if ($MyInvocation.ScriptName -ne "") {  
    if (-not $IsAdmin) {  
      try {  
        $arg = "-file `"$($MyInvocation.ScriptName)`"" 
        Start-Process "$psHome\powershell.exe" -Verb Runas -ArgumentList $arg -ErrorAction 'stop'  
      } 
      catch { 
        Write-Warning "Error - Failed to restart script with runas"  
        break               
      } 
      exit # Quit this session of powershell 
    }  
  }  
  else {  
    Write-Warning "Error - Script must be saved as a .ps1 file first"  
    break  
  }  
} 

# Check if script is running as Adminstrator and if not use RunAs 
Use-RunAs
"Script Running As Administrator" 
Start-Sleep 3

$MenuDNSChange = {

  Write-Host "	******************************************************************" -ForegroundColor Cyan
  Write-Host "	* DNS Client Server Change menu                                  *" -ForegroundColor Cyan
  Write-Host "	*                                                                *" -ForegroundColor Cyan
  Write-Host "	******************************************************************" -ForegroundColor Cyan
  Write-Host "	"
  Write-Host "	Please select an option from the list below:" -foregroundcolor green
  Write-Host "	"
  Write-Host "	0) Show current client DNS settings" -ForegroundColor White
  Write-Host "	"
  Write-Host "	1) Configure DNS Settings for Home" -ForegroundColor White
  Write-host "       Servers: " $DNSServer.Home1, $DNSServer.Home2, $DNSServer.Home3 -ForegroundColor White
  Write-Host "	"
  Write-Host "	2) Configure DNS Settings to OpenDNS " -ForegroundColor White
  Write-host "       Servers: " $DNSServer.OpenDNS1, $DNSServer.OpenDNS2 -ForegroundColor White
  Write-Host "	"
  Write-Host "	3) Configure DNS to DHCP for a NIC" -ForegroundColor White
  Write-Host "	4) Configure DNS to DHCP for all NICs" -ForegroundColor White
  Write-Host "	"
  Write-Host "	5) Enable/Disable a NIC" -ForegroundColor White
  Write-Host "	------" -ForegroundColor White
  Write-Host "	"
  Write-Host "	98) Restart the Server"  -ForegroundColor Red
  Write-Host "	99) Exit" -ForegroundColor Cyan
  Write-Host "	"
  Write-Host "	Select an option.. [1-99]? " -nonewline
}

Do { 
  if ($Choice -ne "None") { Write-Host "Last command: "$Choice -foregroundcolor Yellow }	
  invoke-command -scriptblock $MenuDNSChange
  $Choice = Read-Host

  switch ($Choice) {
    0 {
      #	Show current client DNS settings
      Write-Host "Current DNS Servers:"
      Get-DnsClientServerAddress -AddressFamily IPv4 | Where-Object { $($_.ServerAddresses) }
      Write-Host "    "
      Get-DnsClientServerAddress -AddressFamily IPv6 | Where-Object { $($_.ServerAddresses) }
      Write-Host "    "
    }
    1 {
      #	Configure DNS Settings for Home
      Get-NetAdapter -Physical | Format-Table ifIndex, Name, InterfaceDescription, Status
      $InterfaceChoice = Read-Host "Interface Index ?"
      Set-DnsClientServerAddress -InterfaceIndex $InterfaceChoice  -ServerAddresses ($DNSServer.Home1, $DNSServer.Home2, $DNSServer.Home3)
      Clear-DnsClientCache
      $InterfaceChoice = $null
    }
    2 {
      #	Configure DNS Settings to OpenDNS
      Get-NetAdapter -Physical | Format-Table ifIndex, Name, InterfaceDescription, Status
      $InterfaceChoice = Read-Host "Interface Index ?"
      Set-DnsClientServerAddress -InterfaceIndex $InterfaceChoice  -ServerAddresses ($DNSServer.OpenDNS1, $DNSServer.OpenDNS2)
      Clear-DnsClientCache
      $InterfaceChoice = $null
    }
    3 {
      #	Configure DNS to DHCP for a single NIC
      Get-NetAdapter -Physical | Format-Table ifIndex, Name, InterfaceDescription, Status
      $InterfaceChoice = Read-Host "Interface Index ?"
      Set-DnsClientServerAddress -InterfaceIndex $InterfaceChoice -ResetServerAddresses
      Clear-DnsClientCache
      $InterfaceChoice = $null
    }
    4 {
      #	Configure DNS to DHCP for all NICs
      $AllNetAdapters = (Get-NetAdapter -Physical)
      Foreach ($NetAdapter in $AllNetAdapters) {
        Write-Host "Resetting DNS for NIC: " $NetAdapter.Name 
        Set-DnsClientServerAddress -InterfaceIndex $NetAdapter.ifIndex -ResetServerAddresses
      }
      Clear-DnsClientCache
    }
    5 {
      #	Enable/Disable a Physical NIC
      Get-NetAdapter -Physical | Format-Table ifIndex, Name, InterfaceDescription, Status
      $InterfaceChoice = Read-Host "Interface Index ?"
      $InterfaceName = (Get-NetAdapter -InterfaceIndex $InterfaceChoice).Name
      $InterfaceStatus = (Get-NetAdapter -InterfaceIndex $InterfaceChoice).Status

      If ($InterfaceStatus -like "Disabled") { Write-Host "Enabling NIC... " ; Enable-NetAdapter -Name $InterfaceName } Else { Write-Host "Disabling NIC... " ; Disable-NetAdapter -Name $InterfaceName }
      Clear-DnsClientCache
      $InterfaceChoice = $null
      $InterfaceName = $null
      $InterfaceStatus = $null
    }
    98 {
      #	Exit and restart
      [ValidateSet('Yes', 'No')]$VerifyReboot = Read-Host "Are you sure you want to restart this computer?"
      If ($VerifyReboot -like "yes") { Write-Host "Rebooting... " ; Restart-Computer -ComputerName localhost -Force }
    }
    99 {
      #	Exit
      Pop-Location
      Write-Host "Exiting..."
    }
    default { Write-Host "You haven't selected any of the available options. " }
  }
} while ($Choice -ne 99)