Category: active-directory

computer source code

Get all of the scopes and reservations from all activated DHCP servers in an Active Directory domain

  

Today I had to get all of the scopes and reservations from all activated DHCP servers in our Active Directory domain. I whipped up this PowerShell script and figured someone else out there might need it. Please note that the Import-Excel package is required if you plan on using this script verbatim. It can be easily modified to not use it, however this is left as an exercise for the reader to implement.

Get-DhcpServerInDC | ForEach-Object {
    $DHCPServer = $_
    $hostName = $DHCPServer.DnsName
    Write-Host $hostName

    $scopes = Get-DhcpServerv4Scope -ComputerName $DHCPServer.DnsName | Where-Object { $_.State -eq "Active" } | Select-Object -Property Name, ScopeId, SubnetMask, StartRange, EndRange
    $scopes | Export-Excel ".\DHCPScopes.xlsx" -WorkSheetname "$($hostName)-Scopes" -AutoSize -AutoFilter

    ForEach ($scope in $scopes) {
        $reservations = Get-DhcpServerv4Reservation -ComputerName $DHCPServer.DnsName -ScopeId $scope.ScopeId | Select-Object -Property ClientId, Description, IPAddress, Name
        $reservations | Export-Excel ".\DHCPScopes.xlsx" -WorkSheetname "$($hostName)-Reservations" -AutoSize -AutoFilter 
    }
}
white arrow painted on brick wall

Get all of the conditional forwarders setup in an Active Directory domain

  

Just a quick post here as I found myself needing to find out what conditional forwarders each domain controller in an Active Directory domain had configured. We have nearly a hundred domain controllers and so going manually one-by-one was simply not an option.

I whipped up this PowerShell script and figured that someone else out there might need something similar. It is parallelized (the number of $instances can be changed to do more/less parallel work) and then just dumps it to a CSV-ish file.

$instances = 10

Get-AdDomainController -Filter * | ForEach-Object -ThrottleLimit $instances -Parallel {
    $dc = $_
    Write-Host $dc.Name
    $zones = Get-DnsServerZone -ComputerName $dc.Name | Where-Object {$_.ZoneType -eq "Forwarder" }
    $string = $dc.Name + ","
     ForEach ($zone in $zones) {
         $string = $string + $zone.ZoneName + ","
     }
    Write-Host $string
    $string | Out-File -FilePath ".\zones.txt" -Append 
}

There’s a lot of room for improvement here obviously, but it should at least get you going.