Microsoft Windows DHCP Team Blog

DHCP Server Best Practice Analyzer Available for Download!

teamdhcp — Fri, 30 Apr 2010 19:25:00 GMT

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...(read more)

DHCP Server deletes reservations

teamdhcp — Mon, 19 Apr 2010 07:41:00 GMT

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...(read more)

DHCP Server Callout API usage

teamdhcp — Mon, 06 Jul 2009 09:03:00 GMT

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...(read more)

Rogue DHCP Server detection

teamdhcp — Fri, 03 Jul 2009 09:58:00 GMT

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...(read more)

DHCP Server Performance in Windows Server 2008 R2

teamdhcp — Mon, 29 Jun 2009 13:45:00 GMT

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....(read more)

Option based IP Address assignment Callout Dll

teamdhcp — Fri, 12 Jun 2009 12:40:00 GMT

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...(read more)

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

teamdhcp — Fri, 01 May 2009 11:03:00 GMT

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...(read more)

DHCPv6 Information-Refresh Time Option

teamdhcp — Mon, 20 Apr 2009 11:06:00 GMT

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...(read more)

DHCPv6 User Class Option

teamdhcp — Mon, 20 Apr 2009 11:03:00 GMT

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...(read more)

DHCP Server Events Tool

teamdhcp — Fri, 20 Mar 2009 15:24:00 GMT

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...(read more)

DHCPv6 - Understanding of address configuration in automatic mode and installation of DHCPv6 Server

teamdhcp — Tue, 03 Mar 2009 12:58:00 GMT

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...(read more)

How to monitor and audit DHCP Server configuration changes for compliance

teamdhcp — Tue, 03 Mar 2009 12:46:00 GMT

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...(read more)

DHCP Server service security enhancement

teamdhcp — Tue, 03 Mar 2009 12:41:00 GMT

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...(read more)

New features in DHCP for Windows Server 2008 R2 / Windows 7

teamdhcp — Wed, 25 Feb 2009 22:50:00 GMT

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...(read more)

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

teamdhcp — Wed, 18 Feb 2009 14:34:00 GMT

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...(read more)

MAC Filter Import Tool

teamdhcp — Mon, 16 Feb 2009 16:54:00 GMT

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...(read more)

DHCP Broadcast flag handling in Windows 7

teamdhcp — Thu, 12 Feb 2009 19:44:00 GMT

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...(read more)

How to configure Link Layer based filtering

teamdhcp — Thu, 29 Jan 2009 14:07:00 GMT

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...(read more)

Troubleshooting Link Layer based filtering

teamdhcp — Thu, 29 Jan 2009 13:52:00 GMT

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...(read more)

What Is Name Protection

teamdhcp — Thu, 29 Jan 2009 12:50:00 GMT

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...(read more)

How to configure Name Protection

teamdhcp — Thu, 29 Jan 2009 12:48:00 GMT

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...(read more)

How to configure split-scope using wizard

teamdhcp — Thu, 22 Jan 2009 11:59:00 GMT

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...(read more)

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

teamdhcp — Thu, 22 Jan 2009 10:09:00 GMT

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...(read more)

Link Layer Based Filtering?

teamdhcp — Wed, 21 Jan 2009 20:56:00 GMT

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...(read more)

My Mobile Broadband card does not work

teamdhcp — Fri, 02 Jan 2009 14:23:00 GMT

Please visit the Team Mobile Broadband Blog for discussions on connectivity, using Cellular technologies....(read more)