Export DHCP from Server 2003 to 2008

Hi Chris, thanks for your reply. Very detailed. I ran the script and got the following

thanks

param(
  [Parameter(Mandatory = $true)]
  [String]$SourceServer = "localhost",

  [Parameter(Mandatory = $true)]
  [String]$DestinationServer,

  [String]$ExportPath = "dhcpexport"
)

# Ensure all paths we wish to use exist
$Source = "\\$SourceServer\c$\$ExportPath"
if (-not (Test-Path $Source)) {
  New-Item $Source -ItemType Directory | Out-Null
}
$Destination = "\\$DestinationServer\c$\$ExportPath"
if (-not (Test-Path $Destination)) {
  New-Item $Destination -ItemType Directory | Out-Null
}

# Export the database
netsh dhcp "\\$SourceServer" export "c:\$ExportPath\dhcpserver.txt" all
# Copy the database file
Copy-Item "$Source\dhcpserver.txt" "$Destination\dhcpserver.txt"
# Import the database - DHCP must be installed.
# Add-WindowsFeature could be used to do that if you were to use Remoting.
netsh dhcp "\\$DestinationServer" import "c:\$ExportPath\dhcpserver.txt" all

I noticed a few mistakes now you re-post it. Specifically I missed the "server" command out of the netsh call.

param(
  [Parameter(Mandatory = $true)]
  [String]$SourceServer = "localhost",

  [Parameter(Mandatory = $true)]
  [String]$DestinationServer,

  [String]$ExportPath = "dhcpexport"
)

# Ensure all paths we wish to use exist
$Source = "\\$SourceServer\c$\$ExportPath"
if (-not (Test-Path $Source)) {
  New-Item $Source -ItemType Directory | Out-Null
}
$Destination = "\\$DestinationServer\c$\$ExportPath"
if (-not (Test-Path $Destination)) {
  New-Item $Destination -ItemType Directory | Out-Null
}

# Export the database
netsh dhcp server "\\$SourceServer" export "c:\$ExportPath\dhcpserver.txt" all
# Copy the database file
Copy-Item "$Source\dhcpserver.txt" "$Destination\dhcpserver.txt"
# Import the database - DHCP must be installed.
# Add-WindowsFeature could be used to do that if you were to use Remoting.
netsh dhcp server "\\$DestinationServer" import "c:\$ExportPath\dhcpserver.txt" all 

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Is it throwing errors at you after this change?

Chris

Hi Chris, i get the following error. Am i missing something? Should i change originating server and destination?

PS C:\Documents and Settings\Administrator.TEST> param(
  [Parameter(Mandatory = $true)]
  [String]$SourceServer = "localhost",

  [Parameter(Mandatory = $true)]
  [String]$DestinationServer,

  [String]$ExportPath = "dhcpexport"
)

# Ensure all paths we wish to use exist
$Source = "\\$SourceServer\c$\$ExportPath"
if (-not (Test-Path $Source)) {
  New-Item $Source -ItemType Directory | Out-Null
}
$Destination = "\\$DestinationServer\c$\$ExportPath"
if (-not (Test-Path $Destination)) {
  New-Item $Destination -ItemType Directory | Out-Null
}

# Export the database
netsh dhcp "\\$SourceServer" export "c:\$ExportPath\dhcpserver.txt" all
# Copy the database file
Copy-Item "$Source\dhcpserver.txt" "$Destination\dhcpserver.txt"
# Import the database - DHCP must be installed.
# Add-WindowsFeature could be used to do that if you were to use Remoting.
netsh dhcp "\\$DestinationServer" import "c:\$ExportPath\dhcpserver.txt" all
New-Item : The path is not of a legal form.
At line:18 char:11
+   New-Item <<<<  $Destination -ItemType Directory | Out-Null
    + CategoryInfo          : InvalidArgument: (\\\c$\dhcpexport:String) [New-Item], ArgumentException
    + FullyQualifiedErrorId : CreateDirectoryArgumentError,Microsoft.PowerShell.Commands.NewItemCommand
 
The following command was not found: dhcp \\localhost export c:\dhcpexport\dhcpserver.txt all.
Copy-Item : Cannot find path '\\localhost\c$\dhcpexport\dhcpserver.txt' because it does not exist.
At line:24 char:10
+ Copy-Item <<<<  "$Source\dhcpserver.txt" "$Destination\dhcpserver.txt"
    + CategoryInfo          : ObjectNotFound: (\\localhost\c$\dhcpexport\dhcpserver.txt:String) [Copy-Item], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.CopyItemCommand
 
The following command was not found: dhcp \\ import c:\dhcpexport\dhcpserver.txt all.

____________________________________________________________________________________________________________________________________
PS C:\Documents and Settings\Administrator.TEST> param(
  [Parameter(Mandatory = $true)]
  [String]$SourceServer = "localhost",

  [Parameter(Mandatory = $true)]
  [String]$DestinationServer,

  [String]$ExportPath = "dhcpexport"
)

# Ensure all paths we wish to use exist
$Source = "\\$SourceServer\c$\$ExportPath"
if (-not (Test-Path $Source)) {
  New-Item $Source -ItemType Directory | Out-Null
}
$Destination = "\\$DestinationServer\c$\$ExportPath"
if (-not (Test-Path $Destination)) {
  New-Item $Destination -ItemType Directory | Out-Null
}

# Export the database
netsh dhcp server "\\$SourceServer" export "c:\$ExportPath\dhcpserver.txt" all
# Copy the database file
Copy-Item "$Source\dhcpserver.txt" "$Destination\dhcpserver.txt"
# Import the database - DHCP must be installed.
# Add-WindowsFeature could be used to do that if you were to use Remoting.
netsh dhcp server "\\$DestinationServer" import "c:\$ExportPath\dhcpserver.txt" all
                                           
New-Item : The path is not of a legal form.
At line:18 char:11
+   New-Item <<<<  $Destination -ItemType Directory | Out-Null
    + CategoryInfo          : InvalidArgument: (\\\c$\dhcpexport:String) [New-Item], ArgumentException
    + FullyQualifiedErrorId : CreateDirectoryArgumentError,Microsoft.PowerShell.Commands.NewItemCommand
 

Command completed successfully.
Copy-Item : The network path was not found.

At line:24 char:10
+ Copy-Item <<<<  "$Source\dhcpserver.txt" "$Destination\dhcpserver.txt"
    + CategoryInfo          : NotSpecified: (:) [Copy-Item], IOException
    + FullyQualifiedErrorId : System.IO.IOException,Microsoft.PowerShell.Commands.CopyItemCommand
 

Error while importing subnet 192.168.1.0 "server2003."
This subnet already exists on the local server.

____________________________________________________________________________________________________________________________________

You're leaving source and destination server blank. The params section will only take effect if the content is saved as a script. If you wish to paste that's fine, we just need a function.

I've taken the opportunity to add Get-Help information ("Get-Help Copy-DhcpServer" after you paste it in), a small amount of error condition checking and a few more comments,

function Copy-DhcpServer {
  # .SYNOPSIS
  #   Copies DHCP server configuration and leases from one server to another using NetSh.
  # .DESCRIPTION
  #   Copy-DhcpServer uses the import and export functionality built into NetSh to copy DHCP server configuration between servers.
  #
  #   Warning: This script has little (or no) sanity checking. Ensure you are providing reasonable values for all parameters.
  # .PARAMETER SourceServer
  #   The Windows 2003 or 2008 server from which you wish to export DHCP configuration.
  # .PARAMETER DestinationServer
  #   The Windows 2008 server you wish to import DHCP configuration into.
  # .PARAMETER ExportPath
  #   A local path, relative to C: on each server. By default, DHCP data will be exported to C:\dhcpexport, copied across to the same directory on the destination server, then imported.
  # .INPUTS
  #   System.String
  # .EXAMPLE
  #   Copy-DhcpServer -DestinationServer NewServer
  #
  #   Copies the DHCP server configuration from the local system to NewServer.
  # .EXAMPLE
  #   Copy-DhcpServer OldServer NewServer
  #
  #   Copies DHCP server configuration from OldServer to NewServer.  
 
  [CmdLetBinding()]
  param(
    [Parameter(Mandatory = $true, Position = 1)]
    [String]$SourceServer = "localhost",
  
    [Parameter(Mandatory = $true, Position = 2)]
    [String]$DestinationServer,
  
    [String]$ExportPath = "dhcpexport"
  )
  
  # Verify source and destination are not the same. There are still ways to fool this, but it's a reasonable start.
  if ($SourceServer -eq $DestinationServer -or $SourceServer -match "\.|localhost|$(hostname)" -and $DestinationServer -match "\.|localhost|$(hostname)") {
    Write-Error "Unable to move DHCP configuration. Source and destination are the same." -Category InvalidArgument
    break
  }
  
  # Ensure all paths we wish to use exist
  $Source = "\\$SourceServer\c$\$ExportPath"
  if (-not (Test-Path $Source)) {
    New-Item $Source -ItemType Directory | Out-Null
  }
  $Destination = "\\$DestinationServer\c$\$ExportPath"
  if (-not (Test-Path $Destination)) {
    New-Item $Destination -ItemType Directory | Out-Null
  }
  
  # Export DHCP configuration
  Write-Verbose "Exporting DHCP server configuration from $SourceServer"
  netsh dhcp server "\\$SourceServer" export "c:\$ExportPath\dhcpserver.txt" all

  # Copy the database file to DestinationServer
  Copy-Item "$Source\dhcpserver.txt" "$Destination\dhcpserver.txt"
  # Verify the file exists before importing.
  if (Test-Path "$Destination\dhcpserver.txt") {
    # Test for the presence of the DHCP service on DestinationServer
    if (-not (Get-Service dhcpserver -ComputerName $DestinationServer -ErrorAction SilentlyContinue)) {
      Write-Error "The DHCP server service is not installed on $DestinationServer" -Category InvalidOperation
      break
    }

    Write-Verbose "Importing DHCP server configuration into $DestinationServer"
    netsh dhcp server "\\$DestinationServer" import "c:\$ExportPath\dhcpserver.txt" all

  } else {
    Write-Error "Failed to locate DHCP configuration export file" -Category InvalidOperation
  }
}

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If the usage is unclear please let me know. All you should need to do is paste the main block in (as you've been doing), then run:

Copy-DhcpServer OldServer NewServer

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Chris

Hi Chris, i think im missing something here i keep getting error. Im not sire where to enter the server names.  win2k3 server is named serv2003 and the destination server is serv2008.

thanks

Can you share details of the error? I can't test the code myself, no DHCP servers to run it against so if it's going wrong detail will help a lot.

In theory, if you paste in the main block of code above; the Copy-DhcpServer function you should be able to run:

Copy-DhcpServer serv2003 serv2008

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Chris

thanks Chris much appreciated