Understanding DHCP Allocation Methods in VB.NET

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Understanding DHCP Allocation Methods
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The Windows Server 2003 DHCP server can assign IP addresses using three different allocation methods, which are as follows:
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Dynamic allocation Assigns an IP address to a client computer from a scope, for a specified length of time. DHCP servers using dynamic allocation only lease addresses to clients. Each client must periodically renew the lease to continue using the address. If the client allows the lease to expire, the address is returned to the scope for reassignment to another client.
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Dynamic allocation is the default method for the Windows Server 2003 DHCP server, and it is particularly suitable for networks where IP addresses are in short supply or for networks on which you frequently move computers from one subnet to another.
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Automatic allocation Permanently assigns an IP address to a client computer from a scope. Once the DHCP server assigns the address to the client, the only way to change it is to manually reconfigure the computer. Automatic allocation is suitable for networks where you do not often move computers to different subnets. It reduces network traffic by eliminating the periodic lease renewal messages
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Assigning IP Addresses
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needed for dynamic allocation. In the Windows Server 2003 DHCP server, auto matic allocation is essentially dynamic allocation with an indefinite lease.
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Manual allocation Permanently assigns a specific IP address to a specific computer on the network. In the Windows Server 2003 DHCP server, manually allocated addresses are called reservations. You use manually allocated addresses for computers that must have the same IP address at all times, such as Internet Web servers that have their IP addresses associated with their host names in the DNS namespace. Although you can just as easily configure such computers manually, DHCP reservations prevent the accidental duplication of permanently assigned IP addresses.
Planning a DHCP Deployment
To configure the TCP/IP clients on your computers using DHCP, you must specify in your network infrastructure plan how many DHCP servers you intend to deploy and where to locate them. DHCP clients rely on broadcast transmissions to locate and contact DHCP servers. This means that a DHCP client can communicate directly only with a DHCP server on the same LAN. Fortunately, this does not mean you have to install a DHCP server on every one of your LANs. Most routers are equipped with DHCP relayagent capabilities you can use to support multiple networks with one DHCP server. A DHCP relay agent is a module you configure with the IP addresses of DHCP servers on other networks. The relay agent listens for broadcast transmissions from DHCP cli ents, and when it receives them, it forwards the messages to the DHCP servers on another network. The relay agent then functions as the intermediary between the DHCP client and server during the entire configuration process. Although one DHCP server can configure thousands of clients, most network designers deploy several servers for fault tolerance purposes. However, when you have multiple Windows Server 2003 DHCP servers on your network, you must configure them with separate IP address scopes. DHCP servers do not work together. Each server has its own scopes, from which it allocates IP addresses. If you configure two DHCP servers with scopes that contain the same IP address ranges, you will end up with duplicate IP addresses on your network. You can configure two DHCP servers with scopes to service the same subnet, however. Microsoft recommends that you distribute the IP addresses for a subnet in an 80:20 ratio. Configure one server with a scope containing 80 percent of the addresses available for the subnet, and then configure a second server with the remaining 20 percent of the addresses for that subnet. This provides a fault-tolerance mechanism in case one of the servers fails for an extended length of time.
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