Microsoft KB Archive/181024

= DHCP Event ID 1002: DHCP Received an Unknown Option 006 of Length 007 =

Article ID: 181024

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0

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This article was previously published under Q181024



SYMPTOMS
Your Windows NT Remote Access Service (RAS) server or Routing and Remote Access Service (RRAS) server may log the following event message in Event Viewer about once every minute:

  Event ID   : 1002 Source    : DHCP Description: DHCP received an unknown option 006 of length 007. The raw option data is given below.



CAUSE
This error is usually caused when the following conditions exist:


 * Your Windows NT RAS server is configured to use Dynamic Host Configuration Protocol (DHCP) to assign remote TCP/IP client addresses.
 * You have a router on your network with a feature known as DHCP Spoofing enabled.
 * You do not have a DHCP server currently on your network.



RESOLUTION
To resolve this issue, you will need to do one of the following:

 Configure your RAS server to statically assign IP address using the following steps:

 Click Start, point to Settings, click Control Panel, and double-click Network. Click the Services tab and double-click Remote Access Service. Click Network, click Configure for TCP/IP in Server Settings of the Network Configuration dialog box. Click Use Static Address Pool and enter the IP address pool that you want to use. Click OK and close until you are prompted to restart your computer.</li> Restart your computer.</li></ol>

-or-</li> Disable the DHCP Spoofing feature on your router. Consult your router manufacturer for information on how to do this.

-or-</li> Configure a DHCP server on your network.</li></ul>

<div class="moreinformation_section">

MORE INFORMATION
With a default installation, a Windows NT RAS server is configured with the option to "Use DHCP to assign remote TCP/IP client addresses." With this option set, the RAS server will broadcast DHCPDISCOVER packets to a DHCP server. After the DHCP server responds, the RAS server will cache a range of IP addresses for its dial-in clients. What are not cached are the other configuration options such as Domain Name Service (DNS) servers, Windows Internet Name Service (WINS) servers, and default gateway information.

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

160699 Understanding DHCP IP Address Assignment for RAS Clients

Some routers, including Ascend Pipeline routers, have a feature known as DHCP Spoofing.

NOTE: Ascend Corporation has been purchased by Lucent Technologies, Inc.

This feature is essentially similar to a DHCP Relay Agent. The router will listen for DHCP broadcasts and attempt to answer the requests by responding with a temporary IP address, along with other optional parameters that are pre-configured in the router.

The temporary IP address is the IP address of the router plus 1 for each sequential client request. A client who receives an address from the router will have a lease duration of only 1 minute and will have to renew its address after the lease expires in 50 percent of its lease time.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

For additional information about how to contact the manufacturer, click the article numbers below to view the articles in the Microsoft Knowledge Base:

65416 Hardware and Software Third-Party Vendor Contact List, A-K

60781 Hardware and Software Third-Party Vendor Contact List, L-P

Keywords: kb3rdparty kberrmsg kbinterop kbnetwork kbprb KB181024

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