DHCP Server team is excited to announce that the much appreciated and loved feature, MAC Address based filtering, (previously provided by this callout dll) is now a part of Windows Server 2008 R2 DHCP Server . Check out the blog . The MAC Address filtering...

Windows Vista introduces support for DHCPv6. The DHCPv6 client implementation in Windows Vista is compliant with RFC 3315. It supports 2 modes of operation: a stateless mode and a stateful mode of operation. DHCPv6 Stateless mode is where the host...

What are the major changes? The DHCP server in Windows Server 2008 R2 has invested in the areas of security, reliability, manageability and usability. Similarly on the DHCP Client in Windows 7 has invested on certain optimization for obtaining IP Address...

Reservation Manager - A tool to manage reservations Reservation Manager: Reservations are a critical feature in the DHCP server. Reservations’ are generally used for centralized static IP address assignment for critical machines. This way the IP address...

Understanding of address configuration in automatic mode Windows Server 2008 and Windows Vista include a DHCPv6-capable DHCP client that will perform stateful address autoconfiguration with a DHCPv6 server. Windows Server 2008 includes...

Overview DHCP administrators would like to manage address assignment in the network, by assigning IP address to DHCP clients based on vendor/user class identifier from distinct address ranges in the subnet. This functionality can be added to the Microsoft...

Microsoft product support team often encounters migrated DHCP servers which are dysfunctional. The reason quite often for the bad state of the DHCP server is because backup/restore has been used by the customers for migrating the DHCP server across server...

Is there a particular feature in DHCP (eg. reservations, callout DLL, failover, netsh, ...) that interests you? Have you customized the DHCP server, using scripts or external utilities to suit your environment? Are there features, that you would...

Looking at the problem in configuring Mac Address List File while configuring callout DLL for Mac Address based filtering, here are some detailed tips which will help you in verifying your configuration with one below... · File should contain action...

Split-scope configuration (Widely known as 80/20 Configurations) is typically considered as high-availability deployment scenario for the DHCP Server. It involves configuring scopes with the same subnet address and subnet mask and configuration on two...

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...

Overview Rogue DHCP servers are those DHCP servers that are misconfigured or unauthorized unknowingly or those that are configured with a malicious intent for network attacks. Either be the case the impact on clients that are serviced by the rogue...

1. DHCP Broadcast flag: DHCP messages have ‘flags’ field. The first bit in this field indicates whether the client is expecting a broadcast or unicast response from the DHCP server \ Relay agent. When the bit is set to 1, it indicates that the client...

In Windows Server 2008 (WS08), Microsoft has introduced DHCPv6 functionality to the DHCP server. In Windows Server 2008 (previously known as "Longhorn" Server) Beta 2, we released the DHCPv6 Stateless Server functionality. In Beta 3, we are introducing...

DHCP server or relay agent sending or relaying a DHCP message directly to a DHCP client should examine the BROADCAST bit in the ’flags’ field. If this bit is set to 1, the DHCP message SHOULD be sent as an IP broadcast using an IP broadcast address as...

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...

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...

Microsoft DHCP Server Callout API provides a way for developers to access the critical phases of DHCP protocol processing in Windows Server 2003 family and later. This enables developers to: · Create customized extensions to the Microsoft DHCP Server...

Split scopes are generally used to provide high-availability in a DHCP Server deployment, so that if one server goes down, another server is available from which clients continue to obain an IP address lease. Lets take an example how Split scopes are...

Overview The increased threat perception has caused security to be instrumented and enabled at various levels in the enterprise IT infrastructure. Network and system administrators are increasingly becoming security conscious and are constantly on...

In a previous post, I had discussed the DHCPv6 client behaviour in Windows Vista . A few customers who're evaluating IPv6 in Windows Vista responded asking about the support for DHCPv6 Prefix Delegation and/or asked why the Vista DHCPv6 client doesn't...

DHCP Servers in Windows Server 2008 R2 are deleting reservations, in certain instances, without user intervention. If two DHCP Servers in split scope configuration are configured with identifical reservations, both of these servers may respond to client...

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...

Hello Everybody, Thanks for all those who tried the MacFilterCallout dll . As you all must have checked out by now that Link Layer Filtering feature is a part of Windows Server 2008 R2 DHCP Server. DHCP Server team has come up with a GUI based tool...

With the increase in popularity of laptops, it is very common for users to frequently reconnect to a previously visited network. In order to improve user experience in roaming scenarios, where the user connects back to a previously visited network where...