Microsoft KB Archive/317808

= Scope Level BOOTP User Class Options Are Not Sent to DHCP Server =

PSS ID Number: 317808

Article Last Modified on 6/6/2003

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The information in this article applies to:


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows Server 2003, Standard Edition

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This article was previously published under Q317808



SYMPTOMS
If you set scope level options and scope level Bootstrap protocol (BOOTP) user class options on a Windows 2000 Dynamic Host Configuration Protocol (DHCP) server, the scope level user class options, which are higher priority options, are not sent to DHCP client computers.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
BOOTP packets are limited to 300 bytes in size. If a Windows 2000 DHCP server cannot fit all of the options into a BOOTP-Reply packet, the server leaves some options out of the packet. This behavior cannot be prevented; it is expected behavior.

However, if you set scope level options and scope level BOOTP user class options on the DHCP/BOOTP server, the scope level user class options, which are a higher priority, are left out of the BOOTP-Reply packet.

If a client obtains a lease, you expect that the client receives reserved option values and scope level BOOTP user class options first, and then it receives scope level option values in the space that remains in the packet. However, the server sends out scope level options but it does not send out scope level BOOTP user class options, which should have higher precedence.

This problem only affects BOOTP packets; it does not affect DHCP packets.

Additional query words: bootp dhcp class option

Keywords: kbenv kbnetwork kbprb KB317808

Technology: kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Search kbwin2000Serv kbwin2000ServSearch kbWinAdvServSearch kbWinServ2003Search kbWinServ2003St

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