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How Many DHCP Servers
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When designing your DHCP infrastructure, consider how many servers will be needed. In smaller networks, one DHCP server can service all DHCP-enabled clients. In a routed network, consideration must be given to the transmission speed between the subnets and wide area network (WAN) links, if any are present. You can decide how many DHCP servers are needed based on:
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Routing configuration Network configuration Server hardware
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Placement of DHCP Servers
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If you choose to use only one DHCP server in a routed network, you ll need relay agents to forward broadcasts over your routers. You can configure a Windows NT Server, Windows 2000 Server, or a Windows Server 2003 system to use the DHCP Relay Agent component or verify that the routers are BOOTP compliant. You should also place the Windows Server 2003 DHCP Server on the subnet containing the most hosts.
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Designing a Network and Routing Infrastructure
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Consider this option if your network configuration includes high-speed connections, which are always available, rather than demand-dialing routers or connections to subnets that are only established when needed.
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In a single-server environment, be sure your hardware can handle the load. A DHCP server running on a computer similar to the one listed below can handle thousands of clients. Microsoft has tested DHCP running on a server with the following hardware and network configurations:
Two x86 Family 6 Model 7 Stepping 3 GenuineIntel ~500 MHz 256 MB RAM Three Ethernet 802.3 100 Mbps Network Adapter Cards Six subnets, where four of them were separated from the test DHCP server by routers running the DHCP Relay Agent service Windows Server 2003, Enterprise Edition Operating System Approximately 5,000 scopes DHCP database size 2 GB Several thousand exclusion ranges, option values, and reservations
The test was conducted over a period of 48 days, and the following services were pro vided for DHCP clients over that time. Table 8-8 shows the DHCP functions and the volume of transactions processed during this 48-day period.
Table 8-8
DHCP Test Server Functions and Volume Handled
Total Volume Handled over 48-Day Period 68,412,059 20,039,592 20,039,253 57,559,426 57,470,934 484,012 190,901 0
DHCP Service to Client Lease Assignments DHCP discover messages DHCP offer messages DHCP request messages DHCP acknowledgment messages DHCP negative acknowledgments sent by the server DHCP decline messages Lease releases
As you can see, a DHCP server can handle an extraordinary volume of functions. In fact, it would be very unusual to have a database this large (2 GB). Most DHCP databases
Lesson 4
Creating a DHCP Strategy
8-31
are smaller than 10 MB. This gives you a good benchmark to work with when design ing your DHCP infrastructure. A rule of thumb that may help you select the right server to run the DHCP service is that the performance of a DHCP server increases if the server is configured with:
Multiple CPUs High-performance hard drives Multiple network cards or one that has high bandwidth
If you choose to use multiple DHCP servers, you may want to place DHCP servers on subnets that are connected by slow WAN links or dial-up links to avoid sending DHCP requests across the WAN. Your server hardware does not need to be as powerful because you can spread the load over more than one server.
Availability of DHCP Servers Using 80/20 Rule
To increase the availability factor of two DHCP servers located on different subnets, you can distribute the scopes across the two servers. For example, it is recommended that you allocate 80 percent of the IP addresses to the DHCP Server located on the local subnet, and allocate 20 percent of the addresses to the DHCP Server that is located on the remote segment. If the DHCP Server with 80 percent of the IP addresses allocated crashes, DHCP clients are issued new IP addresses from the remote DHCP Server.
DNS Integration
When Windows Server 2003 is installed, it can be configured to perform dynamic updates to a DNS server that supports dynamic updates. The DHCP Server can register the pointer (PTR) and host (A) resource records on behalf of the DHCP-enabled clients as well as discard these records when a client lease is deleted.
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