Response Rate Limiting in Windows DNS Server

RRL, or Response Rate Limiting, tries to extenuate the DNS amplification attacks. In a DNS amplification attack, the attackers forge the IP address of the victim network and send a lot of queries to the DNS servers. The traditional DNS server responds back to all the queries it receives and as a result the victim network…

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Multiple Active Directory forest support in IPAM

In Windows Server 2016, IPAM will support multiple AD forest deployments. You will now be able to manage DNS and DHCP servers spanning across different Active Directory forests through a single instance of IPAM, provided they have 2-way trust relationship with the AD forest the IPAM server belongs to. IPAM provides the same set of…

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DHCP Failover, Dynamic DNS updates and a Perfect Storm!

This blog article is authored by Joel Christiansen, Senior Support Escalation Engineer, Microsoft In a recent support case, a perfect storm of circumstances came together and resulted in some unexpected behavior.  These kind of perfect storms make for good blogging material. The unexpected behavior was that a DHCP failover node, that did not own a…

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Windows Server 2012 R2- Enhancing DHCP policies and DNS registrations in DHCP server

Introduction Windows DHCP server can perform registration of DNS records with the DNS server on the behalf of its clients. Windows Server 2012 R2 enhances this DNS registration functionality in DHCP server. It provides you more flexibility in registering clients with the DNS server. You can now configure the DHCP server to perform registration only…

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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,…


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…


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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