TAILIEUCHUNG - Active Directory Cookbook for windows server 2003- P9

Active Directory Cookbook for windows server 2003- P9:If you are familiar with the O'Reilly Cookbook format that can be seen in other popular books, such as the Perl Cookbook, Java Cookbook, and DNS and BIND Cookbook, then the layout of this book will not be anything new to you. The book is composed of 18 chapters, each containing 10-30 recipes for performing a specific Active Directory task. Within each recipe are four sections: problem, solution, discussion, and see also. | clients finding domain controllers. If you know the site a client is in you can make a few DNS queries to determine which domain controller they should be authenticating with. The resource records a domain controller registers in DNS can be restricted so querying DNS may return only a subset of the actual domain controllers. See Recipe and Recipe for more information. See Also Recipe for finding the PDC Emulator via DNS and MS KB 267855 Problems with Many Domain Controllers with Active Directory Integrated DNS Zones Recipe Changing the Preference for a Domain Controller Problem You want a particular domain controller to be used less frequently for client requests or not at all. This may be necessary if a particular domain controller is overloaded perhaps due to application requests. Solution You can modify the Priority or Weight fields in SRV resource records by modifying the registry on the domain controller. Open regedit or regedt32 on the domain controller and browse to the following key HKLM SYSTEM CurrentControlSet Services Netlogon Parameters. To configure the Priority add a REG_DWORD with the name LdapSrvPriority. To configure the weight add a REG_DWORD with the name LdapSrvWeight. After you make the change the SystemRoot System32 Config file should be updated and the DDNS updates sent to the DNS server within an hour. You can also restart the NetLogon service to expedite the process. Discussion Each domain controller registers several SRV records that clients use as part of the DC locator process to find the closest domain controller. Two fields of the SRV record let clients determine which server to use when multiple possibilities are returned. The Priority field is used to dictate if a specific server or set of servers should always be contacted over others unless otherwise unavailable. A server with a higher priority . lower priority field value will always be contacted before a server .

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