Scope-level Link layer filtering using DHCP Policies in Windows Server 2012

Introduction Link-layer filtering was a DHCP feature introduced in Windows Server 2008 R2 where one could allow or restrict access to clients based on their MAC address. However the caveat in this feature was that this was possible only at the server level. One of the frequent asks we‘ve had since is a desire for…

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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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Installing and Configuring DHCP role on Windows Server 2012

With the new Server Manager in Windows Server 2012, there have been some changes in the way DHCP role will be installed. The blog post describes, in the sections below, installation and configuration of DHCP Role using Server Manager and PowerShell on Windows Server 2012. Before starting, the user needs to ensure that he/she logs…

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DHCP Policies in Windows Server 2012

Introduction In the recent blogs about DHCP server in Windows Server 2012, we discussed DHCP Failover – a new mechanism for achieving high availability of the Windows DHCP server and DHCP PowerShell – the new command line interface for managing Windows DHCP server. This blog discusses another new feature in DHCP Server in Windows Server…

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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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Bringing PowerShell to DHCP Server

Windows server 2012 comes with PowerShell support for DHCP server role. It provides DHCP administrators a modern, uniform way to manage DHCP servers both locally and remotely, through the command line. These cmdlets get enabled by default when you install DHCP role or DHCP RSAT (Remote Server Administration Tools). The DHCP cmdlets have been designed to…

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Holistic administration of IP address space using Windows Server 2012 IP Address Management

Introduction DHCP and DNS are widely used Windows Server roles providing the foundation for connectivity in enterprise networks. While DHCP enables the assignment of IP addresses and configuration of hosts on demand, DNS allows Internet names like “www.microsoft.com” to be resolved to the corresponding IP address. To make use of DHCP and DNS in an…

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Ensuring High Availability of DHCP using Windows Server 2012 DHCP Failover

Introduction Ensuring high availability of critical network services like DHCP figures high in the list of priorities for any enterprise. In an environment where clients get their IP addresses and network configuration automatically, uninterrupted network connectivity is dependent on the availability of DHCP service at all times. Let us consider for a moment what high…

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