Windows Server R2 DHCP failover configuration

DHCP failover in Windows Server 2012 allows administrators to deploy DHCP services with native high availability, the main objectives of this feature are as follows:

DHCP failover in Windows Server 2012 allows administrators to deploy DHCP services with native high availability, the main objectives of this feature are as follows:

Always provide DHCP service availability on the corporate network.

If a DHCP server is no longer connected, the DHCP client can extend the lease on its current IP address by contacting another DHCP server on the corporate network.

In Windows server (R) R2, two high-availability options are provided for DHCP server deployment. But both of these solutions have their drawbacks:

• Windows in a failover cluster DHCP . This option places the DHCP server in a cluster that has an additional server that is configured by the DHCP service in the primary DHCP Load when the server fails.

Disadvantage: You need to use SAN storage to increase deployment and maintenance costs.

• split scope DHCP DHCP using two separate Span lang= "en-us" xml:lang= "en-us" > DHCP servers share responsibility for scopes. The address of the usual scope 30% are assigned to the backup server. If clients cannot reach the primary server, they can obtain a from the secondary server configuration.

Cons: But if the client needs to lease an IP address, but cannot find the original DHCP server, the client cannot get from another DHCP The server renews the lease address and can only wait for the address to expire.

DHCP failover can be configured in the following two modes:

• Warm standby server mode hot standby modes

• Load Sharing modes load-sharing mode

Now test the configuration load sharing mode:

I have two DHCP servers:

Win2012-1 (no additional domain, DHCP server) 10.10.10.11/24

Win2012-2.demo.local (Domain Controller, DNS, DHCP) 10.10.10.12/24

In the DHCP management console, you can see that the DHCP server win2012-2.demo.local has been configured with IP scope (10.10.10.0 demo scope). IP scope has not been configured on the DHCP service win2012-1.

650) this.width=650; "style=" width:650px;height:427.013px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423 /20130423102519165.gif "border=" 0 "width=" 650 "/>

Right-10.10.10.0 Demo scope, click Configure failover

650) this.width=650; "style=" WIDTH:650PX;HEIGHT:425.967PX; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423 /20130423102519866.gif "border=" 0 "width=" 650 "/>

Select the interval (scope) you want to configure

650) this.width=650; "style=" width:509px;height:556px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423/ 20130423102520604.gif "border=" 0 "/>

Add partner server, win2012-1, next

650) this.width=650; "style=" width:504px;height:552px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423/ 20130423102520346.gif "border=" 0 "/>

To configure the specific failover setting, I select Load Balance mode, create a shared secret, and leave the remaining defaults. In this way, two DHCP each is responsible for the "demo scope 10.10.10.0" 50% IP address.

650) this.width=650; "style=" width:513px;height:556px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423/ 20130423102521281.gif "border=" 0 "/>

Browse settings and click Done.

650) this.width=650; "style=" WIDTH:509PX;HEIGHT:557PX; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423/ 20130423102522967.gif "border=" 0 "/>

The DHCP failover is configured to complete.

650) this.width=650; "style=" width:507px;height:555px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423/ 20130423102522364.gif "border=" 0 "/>

Now go back to the DHCP console and you can see that the DHCP server win2012-1 already has an IP range.

650) this.width=650; "style=" width:650px;height:430.023px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423 /20130423102523281.gif "border=" 0 "width=" 650 "/>

Under Server win2012-1, right-IPv4 under, click on the failover page to see the relevant configuration information.

650) this.width=650; "style=" width:650px;height:429.532px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423 /20130423102524140.gif "border=" 0 "width=" 650 "/>

You can also click Edit to see the details or change the configuration.

650) this.width=650; "style=" width:650px;height:467.544px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423 /20130423102525568.gif "border=" 0 "width=" 650 "/>

Right-IPV4, click on the display statistics, you can see the current IP address rental situation, here can display two DHCP server related situation.

650) this.width=650; "style=" WIDTH:650PX;HEIGHT:424.767PX; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423 /20130423102526501.gif "border=" 0 "width=" 650 "/>

If you want to cancel DHCP failover, right-click Scope, select Deconfigure failover

650) this.width=650; "style=" width:650px;height:375.556px; "alt=" \ "src=" http://www.it165.net/uploadfile/2013/0423 /20130423102526107.gif "border=" 0 "width=" 650 "/>

Windows Server R2 DHCP failover configuration