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Posted by / 26-Dec-2015 02:16

Dns not updating from dhcp

The way to get around this is you can configure DHCP’s Option 081 to update the record for all client, no matter if the client asks or not. If DHCP is on a Windows 2008 R2 DC, to protect the DC when using the Dns Update Proxy group, you must secure the group by running: dnscmd /config /Open Acl On Proxy Updates 0 Using “DHCP Name Protection.” will register A and PTR record on behalf of a client, and will prevent a workstation (non-Windows) Name Squatting, meaning using a name that another machine (non-Windows or Windows) client that DHCP already registered , from registering it’s name.To configure DHCP Option 081, you must look at the DHCP server properties, under the DNS Tab in DHCP properties. After configuring the above provedure, the credentials and Dns Update Proxy group configuratuion will not update current or delete duplicate records. DHCP will give that duplicate named client an IP, but it will not register it into DNS.

Therefore, even if they were to scavenge these records, assuming the time stamp has ever been reached, the machines will refresh themselves anyway! By default, statically configured clients and remote access clients that do not rely on the DHCP server for DNS registration, will re-register their A & PTR records dynamically and periodically every 24 hours.

If you check your servers event viewer you will see EVENT ID 1056: The DHCP service has detected that it is running on a DC and has no credentials configured for use with Dynamic DNS registrations initiated by the DHCP service. Credentials for Dynamic DNS registrations may be configured using the command line “netsh dhcp server set dnscredentials” or via the DHCP Administrative tool.

If you want more information you may find the following useful:

Despite it being a DHCP Option, it’s not found in a DHCP server, scope or class option. You must delete them manually to allow DHCP to take care of all new records moving forward. Quoted from the following link: “Name squatting occurs when a non-Windows-based computer registers in Domain Name System (DNS) with a name that is already registered to a computer running a Windows® operating system.

Also, it will allevaite another issue – If DHCP is on a DC, it will not overwrite the original host record for a machine getting a new lease with an IP previoulsy belonging to another host. The use of Name Protection in the Windows Server® 2008 R2 operating system prevents name squatting by non-Windows-based computers. There are some misconceptions prompting fears that Scavenging will remove everything in your zone, includind servers.

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You can use the following registry subkey to modify the update interval: HKEY_LOCAL_MACHINE\SYSTEM\Current Control Set\Services\Tcpip\Parameters\Default Registration Refresh Interval Data type: REG_DWORD Range: 0x0 – 0x FFFFFFFF seconds Default value: 0x15180 (86,400 seconds = 24 hours) for Windows 2000 Professional Default value: 0x E10 (3,600 seconds = 1 hour) for Windows 2000 Server and Windows Advanced Server Scope: Affects all adaptors This specifies the time interval between DNS update registration updates.

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