Microsoft Windows DHCP Team Blog

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Microsoft Windows DHCP Team Blog

  • 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...
  • DHCP Server Best Practice Analyzer Available for Download!

    DHCP Best Practices Analyzer is now available for download at the below location: http://www.microsoft.com/downloads/details.aspx?FamilyId=90f056d7-9c9b-4bda-82ec-497364adcc11 The same is also available via Windows Update. What is Best Practices...
  • DHCP Server deletes reservations

    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...
  • DHCP Server Callout API usage

    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...
  • Rogue DHCP Server detection

    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...
  • DHCP Server Performance in Windows Server 2008 R2

    This blog post details the performance improvement of DHCP Server in Windows Server 2008 R2 over prior releases. The results published are from a lab environment.
  • Option based IP Address assignment Callout Dll

    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...
  • Windows 7 RC is available for TechNet and MSDN subscribers to download

    We are pleased to announce that the Windows 7 Release Candidate (RC) is available for immediate download to our TechNet and MSDN subscribers. If you’re not a TechNet Plus subscriber, please click here to learn about the benefits of becoming one. Windows...
  • DHCPv6 Information-Refresh Time Option

    DHCPv6 Stateless Clients obtain configuration data from DHCP Server, by sending Information-request messages. The configuration data typically has no associated lifetime, hence there is no information telling a host when to refresh its configuration information...
  • DHCPv6 User Class Option

    RFC3315 specifies User Class Option for IPv6 hosts. DHCP administrators may define specific user class identifiers to convey information about a client's software configuration or about its user's preferences. User classes are created to support the implementation...
  • DHCP Server Events Tool

    This tool can be used by DHCP Administrators to view all the events generated by DHCP Server directly in MMC. This tool can also be very handy in managing the MAC Based Filtering where you can see the list of people entering your network and you will...
  • DHCPv6 - Understanding of address configuration in automatic mode and installation of DHCPv6 Server

    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...
  • How to monitor and audit DHCP Server configuration changes for compliance

    DHCP Server of Windows Server 2008 R2, supports DHCP activity logging, that is it allows DHCP Administrators to monitor the configuration changes of the DHCP Servers. Therefore the events pertaining to DHCP activity logging, will be logged with additional...
  • DHCP Server service security enhancement

    DHCP Server service is moved under Network Service account from what it used to be a Local System account untill Windows Server 2008. With this the DHCP Server service that runs in the context of the Network Service account presents the computer's credentials...
  • New features in DHCP for Windows Server 2008 R2 / Windows 7

    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...
  • Migration of DHCP Server from Windows Server 2003 to Windows Server 2008

    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...
  • MAC Filter Import Tool

    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...
  • DHCP Broadcast flag handling in Windows 7

    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...
  • How to configure Link Layer based filtering

    In the scenarios where there are increasing security concerns and potential threats in networks, Link Layer based filtering feature in Windows Server 2008 R2 DHCP Server provides administrators the ability to specifically control network resource access...
  • Troubleshooting Link Layer based filtering

    Some of the issues that are commonly faced in scenarios where Link Layer based filters have been configured. 1. MAC Address is added in allow list but still the client is denied IP address. Check if there is some wildcard entry in the deny list...
  • What Is Name Protection

    Name Protection is based on the DHCID support to the DHCP server, and support for the new DHCID RR (Resource Record) to Microsoft DNS. In addition, support for DUID will be added to the IPv4 registration on the DHCP client. Note this feature prevents...
  • How to configure Name Protection

    This feature supports prevention of name squatting issues caused due to non-Windows OS machines. Using this feature one could prevent registration of non-Windows OS machine with a same name that is already registered for another machine in DNS Server...
  • How to configure split-scope using wizard

    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...
  • How to prevent address exhaustion from Secondary Server in split-scope deployment

    DHCP secondary server is configured with 20% of address leases and if it serves the clients at the same pace it would run out of address leases and would be useless if the primary DHCP server is down. To avoid address range depletion on the secondary...
  • Link Layer Based Filtering?

    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...