qr code in c# windows application Part 6: Managing Windows Server 2003 Networking and Print Services in C#.NET

Encode QR Code 2d barcode in C#.NET Part 6: Managing Windows Server 2003 Networking and Print Services

Part 6: Managing Windows Server 2003 Networking and Print Services
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Microsoft Windows Server 2003 Inside Out the cpandl.com domain. Every hour that the service is running, it also performs cleanup operations. Database cleanup is used to check for expired leases and leases that no longer apply. The audit logs also serve as a record of all DHCP connection requests by clients on the network. Events related to lease assignment, renewal, and release are recorded according to the IP address assigned, the client s FQDN, and the client s MAC address. Declined leases are listed with the event ID 13 and the description of the event is DECLINE. A DHCP client can decline a lease if it detects that the IP address is already in use. The primary reason this happens is that a system somewhere on the network is using a static IP address in the DHCP range or has leased it from another DHCP server during a network glitch. When the server receives the decline, it marks the address as bad in the DHCP database. See the section Enabling Conflict Detection on DHCP Servers later in this chapter for details on how IP address conflicts can be avoided. Denied leases are listed with the event ID 15 and the description of the event is NACK. DHCP can deny a lease to a client that is requesting an address that cannot be provided. This could happen if an administrator terminated the lease or if the client moved to a different subnet where the original IP address held is no longer valid. When a client receives a NACK, the client releases the denied IP address and requests a new one. As discussed previously, audit logging is enabled by default. If you want to check or change the logging setting, you can do this in the DHCP console. Right-click the server you want to work with, and then select Properties. This displays the dialog box shown in Figure 25-23.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Figure 25-23. Audit logging is enabled by default.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Managing DHCP In the General tab, select or clear Enable DHCP Audit Logging as necessary. Afterward, select the Advanced tab. The Audit Log File Path box shows the current folder location for log files. Enter a new folder location or click Browse to find a new location. Click OK. If you change the audit log location, Windows Server 2003 will need to restart the DHCP Server service. When prompted to confirm that this is OK, click Yes.
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Binding the DHCP Server Service to a Network Interface
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The DHCP Server service should bind automatically to the first NIC on the server. This means that the DHCP Server service should use the IP address and TCP/IP configuration of this network interface to communicate with clients. In some instances, the DHCP Server service might not bind to any available network interface or it might bind to a network interface that you don t want it to use. To resolve this problem, you must bind the DHCP Server service to a specific network interface by following these steps:
1 In the DHCP console, right-click the server you want to work with, and then select Properties. 2 In the Advanced tab of the Properties dialog box, click Bindings to display the Bindings dialog box. This dialog box displays a list of available network connections for the DHCP server. 3 If you want the DHCP Server service to use a connection to service clients, select the option for the connection. If you don t want the service to use a connection, clear the related option. 4 Click OK.
Integrating DHCP and DNS
Using the DNS Dynamic Update protocol, DHCP clients running Windows 2000 or later can automatically update their forward (A) and reverse lookup (PTR) records in DNS or request that the DHCP server does this for them. Clients running versions of the Windows operating system earlier than Windows 2000 can t dynamically update any of their records, so DHCP must do this for them. In either case, when the DHCP server is required to update DNS records, this requires integration between DHCP and DNS. In the default configuration of DHCP, a DHCP server will update DNS records for clients only if requested but will not update records for clients running versions of the Windows operating system earlier than Windows 2000. To change this behavior, start the DHCP console, right-click the server you want to work with, and then select Properties. Select the DNS tab, as shown in Figure 25-24, then choose Dynamically Update DNS A And PTR Records For DHCP Clients That Do Not Request Updates. Don t change the other settings. These settings are configured by default, and you don t need to modify the configuration in most cases.
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