![]() ![]() An update is available for the DHCP server. This article introduces an update for the Dynamic Host Configuration Protocol (DHCP) server role in Windows Server 2008. Fixes a DHCP Server service issue in which the service may stop responding in Windows Server 2008 R2. The DHCP Server service may. A Dynamic Host Configuration Protocol (DHCP) split-scope configuration using multiple DHCP servers allows for increased fault tolerance and redundancy over using only one DHCP server. The new Split-scope Wizard in Windows Server® 2008 R2 replaces the more error prone manual split-scope configuration method used in earlier versions of Windows Server. The wizard-based configuration, along with the advent of scope properties, enables IT Professionals to minimize the possibility of depletion of address pools. The new split-scope configuration employs a secondary DHCP server with a time delay that is configured in its scope properties. The time delay on the secondary DHCP server causes it to respond with a delay to DHCP DISCOVER requests from DHCP clients, enabling the primary DHCP server to respond to and accept the DHCPOFFER first. In the event that the primary DHCP server becomes unavailable, the secondary DHCP server can continue distributing addresses until the primary server is available to service clients again. The split-scope configuration is a server-side enhancement and therefore requires no client configuration to work. ![]() Only IPv4 scopes benefit from a split-scope configuration because IPv6 was designed to alleviate address exhaustion. The following step-by-step instructions guide you in deploying a DHCP split-scope with delay on a secondary server in a test lab. Important The following instructions are for configuring a test lab using the minimum number of computers. Individual computers are needed to separate the services provided on the network and to clearly show the desired functionality. This configuration is not designed to reflect best practices, nor does it reflect a recommended configuration for a production network. The configuration, including IP addresses and all other configuration parameters, is designed only to work on a separate test lab network. • Configure DC1 DC1 is a server running the Windows Server 2003 SP2 operating system. DC1 is configured as a domain controller with Active Directory® Domain Services (AD DS), and as the primary DNS server for the intranet subnet. • Configure DHCP Server 1 and DHCP Server 2 DHCP Server 1 and DHCP Server 2 are servers running Windows Server 2008 R2. DHCP Server 1 is configured with the DHCP Server service, and functions as a primary DHCP server with split-scope configuration. DHCP Server 2 is configured with the DHCP Server service, and functions as a secondary DHCP server with split-scope configuration. • Configure DHCP Client 1 DHCP Client 1 is a client computer running Windows 7. DHCP Client 1 is configured with the DHCP client requesting an IP address from DHCP Server 1 and DHCP Server 2. After all the computers are configured, this guide provides steps for a demonstration of DHCP split scope with delay configured on the secondary server. The following sections provide details about how to perform these tasks. • To start the AD DS Installation Wizard, click Start, click Run, type dcpromo, and then press ENTER. • In the AD DS Installation Wizard dialog box, click Next. • Operating system compatibility information is displayed. Click Next again.
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March 2018
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