Adding 2016 DHCP Scopes with PowerShell in Windows 2012

I have had a lot to do and that is why I have not done so much updating on the blog, soon my third article will be published on Petri IT Knowledge 🙂 I have also attended the MMS in Las Vegas where I got loads of good information and meet lots of people!

In this post I want to show you the improvements in Windows 2012 and with the PowerShell native cmdlets in this version.

The task was to automatically create 2016 DHCP Scopes for clients on a DCHP server and every scope was a /29 net with 3 lease addresses and one router for each.

I tested this on a Windows 2008 R2 with the community powershell module  and with the following script it took, and I am not kidding, almost 5 hours!! the module utilise the net sh commands with dhcp and probably there could be a lot of improvements for performance, and seriously, just creating one or two scopes can be done in the gui but doing over 2000 will demand a scripted way!

Screen Shot 2013-04-24 at 19.28.45
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01# Massive DHCP Scope 2016
02#
03# Niklas Akerlund 2013-04-24
04 
05write-host (get-date)
06for($b=1;$b -le 63 ; $b++){
07    for($i=0;$i -le 255){ 
08        New-DHCPScope -Server localhost -Name 10.10.$b.$i -Address 10.10.$b.$i -SubnetMask 255.255.255.248 | Out-Null
09        $startip = $i+2
10        $endip = $i+4
11        $router = $i+1
12        Add-DHCPIPRange -Server localhost -Scope 10.10.$b.$i -StartAddress 10.10.$b.$startip -EndAddress 10.10.$b.$endip | Out-Null
13        Get-DHCPScope -Server localhost -Scope 10.10.$b.$i | Set-DHCPOption -OptionID  003 -DataType IPADDRESS -Value 10.10.$b.$router | Out-Null
14        $i = $i +8
15    }
16}
17write-host (get-date)

With the PowerShell DHCP module for WIndows 2012 I have created the following script for creating the same amount of scopes and configuration and running it took only about 1 minute!!

Screen Shot 2013-04-24 at 20.02.35
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print?
01# Massive DHCP Scope 2016
02#
03# Niklas Akerlund 2013-04-24
04 
05write-host (get-date)
06for($b=1;$b -le 63 ; $b++){
07    for($i=0;$i -le 255){ 
08        $startip = $i+2
09        $endip = $i+4
10        $router = $i+1
11        Add-DhcpServerv4Scope -Name 10.10.$b.$i -StartRange 10.10.$b.$startip -EndRange 10.10.$b.$endip -SubnetMask 255.255.255.248
12        Set-DhcpServerv4OptionValue -ScopeId 10.10.$b.$i -Router  10.10.$b.$router
13        $i = $i +8
14    }
15}
16write-host (get-date)

As you can see, handling lots of changes and configurations can easily be done in the new Windows 2012 and it´s native cmdlets!

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