DHCP Failover supports BOOTP clients in Windows Server 2012 R2

DHCP Failover is a new feature in Windows Server 2012 which provides for high availability of DHCP service.  Two DHCP servers in a failover relationship synchronize the IP address lease information on a continual basis, there by keeping their respective databases up-to-date with client information and in sync with each other. In Windows Server 2012,…

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Using cascaded relay agents with Windows DHCP Windows Server 2012

Introduction Deploying DHCP failover translates into deploying more DHCP servers working in an Active-Active or Active-Passive mode for a set of scopes/subnets. Given the limitations in certain older switches/routers on the number of IP helpers that can be configured, configuring additional IP helpers to reach these new servers can become a problem. This problem can…

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DHCP Failover patch to address issues caused with a redundant router configuration

Are you using or plan to use a redundant IP helper configuration on routers with a Windows Server 2012 DHCP failover? Some earlier versions of router redundancy implementations (HSRP-Hot Standby Router Protocol/VRRP-Virtual Router Redundancy Protocol) by Cisco and other vendors introduce redundancy in the DHCP messages while relaying DHCP requests. This means a duplication of…

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DHCP Failover using PowerShell

DHCP failover allows administrators to ensure high availability of DHCP service by ensuring that in the event of a DHCP server going down, DHCP clients are able to extend the leases on their current IP addresses by communicating with another DHCP server on the enterprise network. The administrator can use either MMC or PowerShell for…

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Automatic syncing of scope configuration changes between 2 DHCP failover servers

DHCP Failover is a new feature in Windows Server 2012 which provides for high availability of DHCP service.  Two DHCP servers in a failover relationship synchronize the IP address lease information on a continual basis there by keeping their respective databases up-to-date with client information and in sync with each other. However, if the user…

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Migrating existing DHCP Server deployment to Windows Server 2012 DHCP Failover

Introduction This article provides information on how to migrate an existing DHCP server deployment on Windows Server 2008 or Windows Server 2008 R2 to Windows Server 2012 DHCP Failover. DHCP Failover feature requires two Windows Server 2012 on which the DHCP role is installed. To migrate from an existing DHCP server deployment to use DHCP…

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Multi-Site deployment topologies for DHCP Failover

The two modes of configuring DHCP Failover Load Balance and Hot Standby enables a wide range of deployment topologies involving failover deployment between the DHCP servers present in the same site or spread across multiple sites. The most rudimentary one is the single-site deployment, where both the servers in a failover relationship are located at…

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DHCP Failover Hot-Standby Mode

In the previous blog on DHCP Failover, we discussed the DHCP failover load balance mode where both DHCP servers respond to client requests and load balance the requests between them based on an admin specified load distribution ratio. In the other mode of a failover relationship, known as the Hot-Standby mode (Active-Passive), only one of…

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DHCP Failover Load Balance Mode

As described in the blog on DHCP failover, there are two types of DHCP Failover relations – Load Balance which provides Active-Active configuration and Hot Standby which provides Active-Passive configuration. This blog article elaborates on the Load Balance failover relationship. As is evident from the name, in load-balance mode of operation both the servers respond…

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