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Creating QR Code ISO/IEC18004 in .NET framework Objective 1.2

Objective 1.2
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Manage DHCP
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DHCP is typically configured on a member server in an Active Directory domain. This objective assumes that DHCP has been installed, configured, and authorized in Active Directory, and that it has given out leases to clients. However, this scenario is never the end of the story. You might be asked to set up an additional scope, possibly to support a second subnet or to support remote access clients. You create scopes from the DHCP console using the New Scope Wizard. The wizard prompts you for a start and end address and for an exclusion range, and it expedites the task of setting up scopes provided you understand the significance of the information you are supplying. A reservation ensures that a client always obtains the same IP address when it renews its lease. A client with a reservation receives a DHCP lease even if all the leases available for nonreserved clients have been allocated. Reservations are typically set up for such clients as network-enabled print devices that other clients access by specifying a fixed IP address. Politically, you would also be wise to create a reservation for your boss! You create a reservation by expanding the appropriate scope, right-clicking Res ervations, and selecting New Reservation. You are then asked to supply a reservation name (usually the host name), the IP address to be allocated, and the Media Access Control (MAC) address of the client. DHCP options allow you to configure a large number of settings on a client. Typically, however, you will configure options 003, 006, and 015: default gateway (router), DNS server, and domain name, respectively. You can define options at the server level for all scopes, at the scope level for all clients, and at the client level only for client reser vations. Client options override scope options for a specific reserved client, and scope options override server options for a specific scope. If your DHCP server services two network segments, you must set up a DHCP relay agent unless the router connecting the two subnets is RFC 2123 compliant and is already configured to pass DHCP broadcasts. Servers running the Microsoft Windows Server 2003 Routing And Remote Access service that are configured as routers do not pass DHCP broadcasts; therefore, you need to install DHCP Relay Agent on the router and configure it with the address of the DHCP server from the Routing And Remote Access console. Alternatively, you can install and configure DHCP Relay Agent on a server in the subnet that does not contain the DHCP server. You do not need to install and configure DHCP Relay Agent on a server in the same subnet as the DHCP server, and it will not run on the DHCP server itself. Another situation in which you need to install DHCP Relay Agent is when you have a server running the Routing And Remote
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13-16
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Implementing, Managing, and Maintaining IP Addressing (1.0)
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Access service that supports remote access clients, but does not have a DHCP server available on its network segment. Even when the Routing And Remote Access service allocates client addresses from a static pool, you should still install DHCP Relay Agent to enable the remote clients to receive DHCP options. The Jetpack utility automatically backs up and regularly restores the DHCP database. A new feature in Microsoft Windows Server 2003 DHCP enables you to back up the database and restore it from the DHCP console. In previous Windows operating sys tems, moving a DHCP database from one server to another involved editing the Reg istry of the new server. The Network Shell (Netsh) utility now allows you to perform this task without needing either to edit the Registry edits or to recreate the scopes and superscopes. Only one scope can be active (in other words, can issue leases) on a single physical subnet at any one time. Sometimes, you want to replace a scope with another: for example, if you are converting to a private addressing scheme. In this case, if you cre ate a new scope and simply deactivate the old one, errors will occur and your clients will not obtain new leases. The solution is to put both the old and new scopes in a superscope. You can then deactivate the old scope or add its addresses to the exclu sion range of the superscope. Clients are then leased IP addresses from the new scope. Another use of superscopes is when you have two or more logical subnets on the same physical network segment and want the DHCP server to issue leases for clients in both logical subnets. You can implement DHCP failover protection by having two DHCP servers on the same network issue valid address leases from nonoverlapping scopes. This method is seldom satisfactory, however, and the recommended method is to cluster two DHCP servers. This configuration results in a virtual DHCP server with a single virtual host name and IP address. Which of the two servers is actually issuing leases is transparent to the client. Paradoxically, failover protection is easier to implement when you have two network segments. You then configure a DHCP server on each segment and create two scopes: one for the local subnet and one for the remote subnet. Approximately 80 percent of the available leases should be contained in the local scope. If no scope overlap exists and the DHCP relay agent is configured to point to both DHCP servers, either server will service both subnets if the other goes down.
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Objective 1.2: Manage DHCP 13-17
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