I had this question after viewing Moving DHCP scope fro 2003 to 2008 R2
When we tried to import the scope (to 2008 R2) that we exported (on 2003) we got an error. Please note that the 2008 R2 server we are trying to import the scope to already has DHCP running (authorized) and it servicing other scopes that we WANT TO KEEP, thus we are trying to append to that DHCP server. We got an error option "6" when importing (as noted below), but I don't want to delete the Server Options entries 006 and 015 as I don't know what impact that would have on the existing scope.
Error while importing option “6.” while moving DHCP database from Windows Server 2008 to another Windows Server 2008/2003 or 2008 R2
To move DHCP from one server (2003/2008) to another you can use the following steps
1.At the command prompt type netsh dhcp server export C:\dhcpdata.txt all , and then press ENTER.
Note: You must have local administrator permissions to export/import the data.
Configure the DHCP server service on the server that is running Windows Server 2008
1.Add DHCP Server Role
2.Make sure to Authorize DHCP while installing the Role.
Import the DHCP database
1.Copy the exported DHCP database file to the local hard disk of the Windows Server 2008-based computer.
2.At the command prompt, type netsh dhcp server import c:\dhcpdata.txt all and press ENTER
If might receive the following error
“Error while importing option “6.” “This option conflicts with the existing option “” An Internal Error Occurred.”
It is because by default when you install DHCP Server Role, it puts the following entries in Server Options.
006 DNS Server
015 DNS Domain Name
To fix the Error –> Just delete the above two entries from Server options and Run the Import DHCP database command again.