Tools needed…

1. Some knowledge of the netsh command
2. A text file with the ip address’s of the scopes to be modified
3. IP address’s of the DHCP servers to change
4. And a script of course.

The easiest way to obtain the ip address’s of the scopes to modify is to log onto the DHCP server itself and open your support tools command prompt

Step 1.

Go to netsh command line to understand more on this command. And make sure you create a test subnet to run my scripts agains to make sure this is right for you.

Step 2.

C:\Program Files\Support Tools>netsh dhcp server 172.x.x.x show scope > c:\scope.txt

At the command prompt enter the section above in red (insert the ip address of the DHCP server in place of 172.x.x.x. This will create a text file with the sope info on your c drive.

You will now want to open scope.txt and clean it up. You only want the IP address’s of the scopes to be changed. the text file should be in the following format

Step 3

for /f “tokens=1″ %%a in (c:\scope.txt) DO netsh dhcp server 172.x.x.x scope %%a set optionvalue 006 IPADDRESS DNS_Address_1 DNS_Address_2 DNS_Adress_3

172.x.x.x = Your DHCP server IP address

DNS_Address_#= DNS server IP address’s

Copy the above red text into a text file and save it as scope_edit.bat to the same folder as scope.txt. Run the bat file. This will run through each IP address changing the dns entires. does not append the scope option for DNS it overwrites it. However it will not effect any other options that are currently set.

You can now use the same script to change your wins optin by changing optioncalue 006 to optionvalue 044

 Good luck

note: the import and export command cannot be ran remotely

Replace 198.168.0.10  with your DHCP server IP address

Replace 198.168.1.0 198.168.2.0 198.168.3.0 with the IP scopes that you are exporting and importing.

Export the scopes for the DHCP server 1

Step 1

1. Log on to the server that you are exporting from.
2. open the command prompt
3. Run the following command from the command prompt on the DHCP server that have the scopes already created.

Netsh DHCP server 198.168.0.10 export c:\scope 198.168.1.0 198.168.2.0 198.168.3.0

Step 2

Import the scopes to DHCP server 2  

1. Copy the scope file to the second DHCP server. 
2. Log on locally to the second DHCP server, open the command prompts and run the following command to import the scopes

Netsh DHCP server 198.168.0.10 import c:\scope 198.168.1.0 198.168.2.0 198.168.3.0

Step 3

1. Confirm that the scopes are now on the second server.
2. Modify the Exclusions if you have any. If this is a split scope then the exclusions should be opposite of each other on the two servers.

Good luck.

 

 The following is from Technet http://technet2.microsoft.com/windowsserver/en/library/61427fbd-de1f-4c8a-b613-321f7a3cca6a1033.mspx?mfr=true

import

Imports a DHCP service configuration from a file to the local service.

Syntax

import [Path]FileName {all | ScopeList]

Parameters

[Path] FileName

Required. Specifies, by name, the file from which the DHCP configuration will be imported. If the path, the file name, or both contain spaces, quotation marks must be used.

{all | ScopeList}

Required. Specifies which scopes you want to import. The parameter all imports all scopes represented in the file you specify. The parameter ScopeList imports the scopes that correspond to the IP addresses you list. Each IP address in the list must be separated by spaces.

Remarks

•	This command works only on the local server.
•	While the import command runs, the DHCP service is stopped and does not respond to DHCP clients seeking new leases or lease renewals.
•	If the DHCP service has a large number of scopes or a large number of client address leases, this command can take a long time to run.

Examples

In the first example, this command imports the complete DHCP service configuration from the file c:\Temp\Dhcpdb.

In the second example, this command imports the DHCP configuration for scopes 10.0.0.0 and 192.168.0.0 from the file c:\Temp\Dhcpdb

In the third example, this command imports the complete DHCP service configuration from the file c:\My Folder\Dhcp Configuration. Note that both the path and file name contain spaces, so quotation marks are used.

import c:\Temp\Dhcpdb all

import c:\Temp\Dhcpdb 10.0.0.0 192.168.0.0

import “c:\My Folder\Dhcp Configuration” all