Create DHCP Scope with Variables?

PowerShell Help
1

Hi!

I need to Create a lot of DHCP scopes on diffrent server, i have tried to create a script that asks for the 3 first octets of the subnet, but i can´t get it to work as i want, does anyone has any idea how i can do it

I have done it this way ( the scripts ask for a lot of more info, but i have skipped the working parts)

$Subnet = Read-host "Enter Subnet for Office (ex. 192.25.58)"

Add-DhcpServerv4Scope -Name '$Office' -StartRange '$Subnet.100' -EndRange '$Subnet.150 '-SubnetMask 255.255.255.0 -Description '$office'
Set-DhcpServerv4OptionValue -DnsServer 11.11.0.30,11.11.0.31 -DnsDomain "int.domain.local" -Router $Subnet.2

The Scope details are always the same , the only thing that is changing is the 3 first octets… (the 2nd and 3rd octets)

2

Single and double qoutes work differently. Double qoutes are expanded and will resolve variables. Single qoutes are literal, what you type is what is used.

PS C:\Users\rasim> $test = 'foo'

PS C:\Users\rasim> 'Test value is $test'
Test value is $test

PS C:\Users\rasim> "Test value is $test"
Test value is foo

There are a couple of other small things such as the DNS servers is a string array, not a string, so the values are separated by commas. Additionally, use splatting to make it a bit easier to read:

$Office = Read-Host "What office?"
$Subnet = Read-host “Enter Subnet for Office (ex. 192.25.58)”


$addParams = @{
    Name         = "$Office"
    StartRange   = "$Subnet.100" 
    EndRange     = "$Subnet.150"
    SubnetMask   = "255.255.255.0"
    Description  = "$Office"
}

Add-DhcpServerv4Scope @addParams


$setParams = @{
    DnsServer = "11.11.0.30","11.11.0.31" 
    DnsDomain = “int.domain.local” 
    Router    = "$Subnet.2"
}

Set-DhcpServerv4OptionValue @setParams
3

Thanks for your incredible help :slight_smile:

It worked like a charm, i need to learn little more about this !