Add-DhcpServerV4Scope import-csv LeaseDuration Time Value Entry

Nicholas J. Conger 1 Reputation point


We're trying to export about 450 scopes and re-create them on another DHCP Server importing the values from a CSV and running the Add-DhcpServerV4Scope cmdlet.

Everything works perfectly except the LeaseDuration value.

See the value is set to "day.hrs:mins:secs" format.

Running the script gets the error "Add-DhcpServerv4Scope : Cannot process argument transformation on parameter 'LeaseDuration'. Cannot convert null to type "System.TimeSpan"."

Does anybody have a value that the time can be inputted into a CSV that the Add-DhcpServerV4Scope cmdlet can use to set the scope value to the specified LeaseDuration.

Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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Windows Server PowerShell
Windows Server PowerShell
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.PowerShell: A family of Microsoft task automation and configuration management frameworks consisting of a command-line shell and associated scripting language.
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  1. Limitless Technology 39,506 Reputation points


    I am not sure how exactly looks like the csv that you are having prepared, but to import multiple DHCP scopes to a DHCP server. Some settings needs to be added on top level. For example DNS servers.

    Required header in CSV:

    $dhcpserver = ""
    $scopes = Import-Csv -Path dhcp.csv -Delimiter ";"
    foreach ($scope in $scopes)
    $name = $
    $description = $scope.description
    Write-Output "Creating scope $name"
    Add-DhcpServerv4Scope -ComputerName $dhcpserver -Name "$name" -Description "$description" -StartRange $scope.startrange -EndRange $scope.endrange -SubnetMask $scope.subnetmask -State Active -LeaseDuration 1.00:00:00
    Set-DhcpServerv4OptionValue -Router $scope.router -ScopeId $scope.scopeid -ComputerName $dhcpserver

    --If the reply is helpful, please Upvote and Accept as answer--

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  2. Rich Matheisen 45,671 Reputation points

    Is it safe to assume that you're using a variable as the value for the lease duration? The error says that the variable either doesn't exist or that it contains a $null value.

    If you can't find where the problem lies, try adding Set-PSDebug -Strict at the the beginning of your script. If you try to use an undeclared variable you'll get an error like "The variable '$NewVar' cannot be retrieved because it has not been set." along with the line number in the script.

    It may simply be a misspelling of the variable name (or a property name).

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