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Microsoft/Migrate-DHCP.ps1

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+<#
+.Synopsis
+   Script to Automated DHCP Migration
+.DESCRIPTION
+   Takes DHCP Configuration from Source server and converts to Destination (local server) configuration.
+.EXAMPLE
+  .\migrate-dhcp.ps1 -source sbs2011server
+.EXAMPLE  
+  .\migrate-dhcp.ps1 -source sbs2011server -detailed
+#>
+param(
+    [Parameter(Mandatory=$True,Position=0)]
+    [string]$source,
+    [switch]$detailed
+)
+$destination = $env:Computername
+$sourceIp = [System.Net.Dns]::GetHostAddresses($source)
+$sourceIP = $sourceIP.IPAddressToString
+$currentIP = get-netIPConfiguration
+$destIntAlias = $currentIP.InterfaceAlias
+$destIP = $currentIP.IPv4Address.IPAddress.ToString()
+$destIPv6 = $currentIP.ipv6linklocaladdress.ipAddress
+Write-Output "DHCP Migration "
+Write-Output "Source           : $source"
+Write-Output "Source IP        : $sourceIP"
+Write-Output "Destination      : $destination"
+Write-Output "Destination IP   : $destIP"
+Write-Output "Destination IPv6 : $destIPv6"
+Write-Output "Reading DHCP Configuration.. Please Wait"
+$dhcpConfig = netsh dhcp server "\\$source" dump
+if(($dhcpConfig) -like "Unable*")
+{
+    Write-Output "Error Collecting DHCP Configuration : $source"
+    Write-Output "Check DHCP Service is Running on Source Server!"
+}
+else
+{
+    Write-Output "Processing DHCP Configuration.. Please Wait"
+    foreach ($line in $dhcpConfig)
+    {
+        
+        if(($line) -like "dhcp*")
+        {
+            try
+            {
+                if($line.Contains($source))
+                {
+                   $line = $line.Replace("$source","$destination")    
+                }
+                if($line.Contains($sourceIp))
+                {
+                    if($line.Contains("Add iprange") -or ($line.Contains("optionvalue 3") -or ($line.Contains("add excluderange"))))
+                    {
+                        # Skip Line Changes
+                    }
+                    else
+                    {
+                        $line = $line.Replace("$sourceIP","$destIP")    
+                    }
+                }
+                if($line.Contains("23 IPV6ADDRESS"))
+                {
+                   $line = $line.Split("""")
+                   $sourcev6 = $line[1]
+                   $line = $line.Replace("$sourcev6","$destIPv6")
+                   $line = $line.Replace("%3","")
+                }
+                if($line.Contains("Local Area Connection"))
+                {
+                    $line = $line.Replace("Local Area Connection","$destIntAlias")
+                }
+                $command = "netsh $line"
+                if($detailed)
+                {
+                    Write-Output $command
+                }
+                cmd /c $command | Out-Null
+            }
+            catch
+            {
+                $errorMessage = $_.exception.message
+            }
+        }
+    }
+    Add-DhcpServerInDC -DnsName $destination -IPAddress $destIP
+    Set-DhcpServerv4DnsSetting -ComputerName $destination -DynamicUpdates Always -DeleteDnsRROnLeaseExpiry $true
+    $username = "$env:UserDomain\$env:userName"
+    $pwd = Read-Host -AsSecureString -Prompt "Enter Password for $username for DHCP/DNS Update"
+    $cred = New-Object System.Management.Automation.PSCredential($username,$pwd)
+    Set-DHCPServerDNSCredential $cred
+    Set-DHCPServerSetting -ConflictDetectionAttempts 2
+    Write-Output "Disable DHCP Service on : $source"
+    Write-Output "Stop DHCP Service on    : $source"
+    Get-Service -ComputerName $source -ServiceName dhcpserver | Set-Service -StartupType Disabled
+    Get-Service -ComputerName $source -ServiceName dhcpserver | Stop-Service -Force
+    Write-Output "DHCP Configuration Complete"
+}