PowerShell: Convert string of comma separated IPs to IPAddress object

dhcppowershell

I'm working with the Get-DhcpServerv4Scope cmdlet and am looking to pull multiple scopes into a variable with the -scopeid switch. 

Get-DhcpServerv4Scope -scopeid 10.1.0.0,10.1.1.0

However if I do:

$IP = "10.2.0.0,10.1.0.0"
Get-DhcpServerv4Scope -scopeid $IP

I get the error:

Get-DhcpServerv4Scope : Cannot process argument transformation on
parameter 'ScopeId'. Cannot convert value "10.2.0.0,10.1.0.0" to type
"System.Net.IPAddress[]". Error: "Cannot convert value
"10.2.0.0,10.1.0.0" to type "System.Net.IPAddress". Error: "An invalid
IP address was specified.""

Anyone have an idea how to get do this conversion?

Edit: Here's the script I'm trying to fit this into. I'd like to have a way to point this script at a server and it rebuilds all scopes. right now I output the scopes in a tab delimited file, then copy & paste them into the Get-dhcpv4scope to store all of the scopes in one variable. I'm open to any suggestions:

#GetScopes
$ScopeExclusions = Get-DhcpServerv4ExclusionRange
[string]$ScopesCSV=Get-DhcpServerv4Scope | Select ScopeID | convertto-
csv -notypeinformation
$ScopesCSV.replace('" ', ',').replace('"', '').replace('ScopeId,', '') 
| out-file c:\users\aturner\desktop\csv.txt
**Copy contents from file to clipboard**
$Scopes=Get-DhcpServerv4Scope -scopeid *PasteScopeCSVListHere* | select 
ScopeId,Name,Description,SubnetMask,StartRange,EndRange,LeaseDuration

#Delete Scopes
$Scopes | % { Remove-DhcpServerv4Scope -ScopeId $_.scopeid -force}

#Rebuild Scopes
$Scopes | % {Add-DhcpServerv4Scope -Name $_.name -Description 
$_.description -SubnetMask $_.SubnetMask -StartRange $_.StartRange -
EndRange $_.EndRange -LeaseDuration 8.00:00:00 }
$ScopeExclusions | % {Add-DHCPServerv4ExclusionRange -ScopeID $_.ScopeID -
StartRange $_.StartRange -EndRange $_.EndRange}

New Code:

#GetScopes
$ScopeExclusions = Get-DhcpServerv4ExclusionRange
[string]$ScopesArray=Get-DhcpServerv4Scope | Select ScopeID | convertto-csv -notypeinformation
$ScopesCSV=$ScopesArray.replace('" ', ',').replace('"', '').replace('ScopeId,', '') 
$ScopeReservations = Get-DhcpServerv4Scope | Get-DhcpServerv4Reservation | select *
$Scopes=Get-DhcpServerv4Scope -scopeid $ScopesCSV.Split(',') | select ScopeId,Name,Description,SubnetMask,StartRange,EndRange,LeaseDuration

#Delete Scopes
$Scopes | % { Remove-DhcpServerv4Scope -ScopeId $_.scopeid -force}

#Rebuild Scopes
$Scopes | % {Add-DhcpServerv4Scope -Name $_.name -Description $_.description -SubnetMask $_.SubnetMask -StartRange $_.StartRange -EndRange $_.EndRange -LeaseDuration 8.00:00:00 }
$ScopeReservations | % {Add-DhcpServerv4Reservation -ScopeID $_.ScopeID -IPAddress $_.IPAddress -ClientId $_.ClientID -Description $_.Description -Name $_.Name -Type $_.Type}
New

Best Answer

$IPobj = $IP | ConvertFrom-Csv -Delimiter "," -Header "ip1", "ip2"
Get-DhcpServerv4Scope -scopeid $IPobj.ip1, $IPobj.ip2

However your main problem is that $IP is a string, while when you manually pass 10.1.0.0,10.1.1.0 as parameters you are actually passing 2 strings.

You would be better off creating $IP as an array:

$IP = @("10.2.0.0", "10.1.0.0")
Get-DhcpServerv4Scope -scopeid $IP[0],$IP[1]

This way you can script / loop through the array if you have multiple scopes.

Adam asked how to do this dynamically and although I don't know where are we getting "10.2.0.0" and "10.1.0.0" from, you'll just need to keep populating the $IP array with all the scope IDs you need to check, then loop as follows:

foreach ($scopeid in $IP) { Get-DhcpServerv4Scope -scopeid $scopeid }

The above code goes through each entry in $IP, temporarily storing it in $scopeid and using it as parameter to call the Get-DhcpServerv4Scope cmdlet.

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