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Ideally you should have only one Authorized DHCP for a specified scope<br />
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&nbsp;or if you wish to use two DHCP server you should have split scope to dish out different range of IP address so no duplication happens.
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Ideally you should have only one Authorized DHCP for a specified scope

 or if you wish to use two DHCP server you should have split scope to dish out different range of IP address so no duplication happens.

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I recently upgraded 1 of our 2 domain controllers to 2008R2. So that now we have DC1 - 2008r2 and DC2 - 2003R2 &nbsp;During the process I exported the DHCP and imported to the new server. &nbsp;Both servers are authorized but what I am seeing is that the 2 servers are assigning ips independantly causing duplicate ips on the network? &nbsp;Is there something I missed to make them talk together so they dont assign the ips more than once or should I only have 1 server authorized for DHCP on the domain?
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I recently upgraded 1 of our 2 domain controllers to 2008R2. So that now we have DC1 - 2008r2 and DC2 - 2003R2  During the process I exported the DHCP and imported to the new server.  Both servers are authorized but what I am seeing is that the 2 servers are assigning ips independantly causing duplicate ips on the network?  Is there something I missed to make them talk together so they dont assign the ips more than once or should I only have 1 server authorized for DHCP on the domain?

DHCP Server Multiple IP Address

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).