Back To Basics: Windows 2000 Rogue DHCP Server Detection? Page 3

Thomas Shinder

So Exactly When Will a DHCP Server Start?

The new DHCP server will start DHCP server services if:

  1. There are other DHCP servers on the segment that are authorized DHCP servers and the new DHCP server is listed in the Active Directory's list of authorized DHCP servers, or
  2. The new DHCP server is the only DHCP server on the segment. Since the new DHCP will not receive a response to the DHCPINFORM message query, the new DHCP server will not receive any information about the Active Directory, or
  3. The new DHCP server is on a segment with other Windows 2000 DHCP Servers that are workgroup members or all other DHCP servers on the segments are downlevel systems (such as Windows NT 4.0 or UNIX DHCP servers).

In the second and third examples the new DHCP server is unable to contact another DHCP server that has information regarding an Active Directory domain. The "lone" DHCP server will continue to send a DHCPINFORM message every five minutes hoping to find a DHCP Server with information about an Active Directory domain. If the new DHCP server later receives a DHCPACK from a Windows 2000 DHCP server that contains information about an Active Directory domain, the new DHCP server will check to see if it is authorized in the Active Directory and if not, will disable its DHCP server service.

Get to Know the Windows 2000 DHCP Server's New Features

The Windows 2000 DHCP Server has many new features that are worth looking at in more detail. Another important feature of the Windows 2000 DHCP Server is its ability to integrate with the Windows 2000 Dynamic DNS Server. But we'll save that discussion for another time.

For More Information

For more information about the Windows 2000 DHCP Server and what can go wrong with it at times, check out Troubleshooting Windows 2000 TCP/IP.

For a thorough grounding on how the DHCP Server is supposed to work, check out our Windows 2000 Network Infrastructure Study Guide.

You can read about DHCP Concepts in the online help file at Microsoft's web site.

This article was originally published on Oct 9, 2000
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