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The values that appear for DHCP option 81 and the corresponding GUI meanings that are shown in the DHCP MMC snap-in in Windows Server 2003

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Introduction

On a Dynamic Host Configuration Protocol (DHCP) server that is running Windows Server 2003, you type the following command at a command prompt:
netsh dhcp server scope x.x.x.x show optionvalue
Note In this command, x.x.x.x represents the DHCP scope that you want to query.

This command lists the options of a DHCP scope and then searches the output of DHCP option 81.

In the Properties dialog box of a DHCP scope in the DHCP Microsoft Management Console (MMC) snap-in, the output value of DHCP option 81 is related to the settings that are shown on the DNS tab of the snap-in. The numeric value that is shown next to the Option Element Value item differs according to the check boxes and the options that you select in the graphical user interface (GUI).

This article lists the values that appear for DHCP option 81. Additionally, it lists the corresponding GUI meanings that are shown on the DNS tab in the Properties dialog box of a DHCP scope.

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More information

The values for DHCP option 81 and the corresponding GUI meanings are listed in the following table.
Option Element Value Netsh Option ID 81 outputSettings that are shown in GUIComments
Option ID value not shownNot applicable"Enable DNS dynamic updates according to the settings below": Selected

"Dynamically update DNS and PTR records only if requested by DHCP clients": Selected

"Discard A and PTR records when lease is deleted": Selected		These settings are inherited from the settings of the DHCP server for the DHCP scope. (These settings are found on the DNS Dynamic Updates tab.)

These server settings are default DHCP settings.
0OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 0 		"Enable DNS dynamic updates according to the settings below": UnselectedAutomatic update settings that are configured from the scope are turned off.
1OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 1 		"Enable DNS dynamic updates according to the settings below": Selected

"Dynamically update DNS and PTR records only if requested by DHCP clients": Selected
3OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 3 		"Enable DNS dynamic updates according to the settings below": Selected

"Dynamically update DNS and PTR records only if requested by DHCP clients": Selected

"Dynamically update DNS A and PTR records for DHCP clients that do not request updates (for example, clients running Windows NT 4.0)": Selected
5OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 5 		"Enable DNS dynamic updates according to the settings below": Selected

"Dynamically update DNS and PTR records only if requested by DHCP clients": Selected

"Discard A and PTR records when lease is deleted": Selected		These settings are the same as the default settings. However, they are manually set after the scope is created.
7 OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 7 		"Enable DNS dynamic updates according to the settings below": Selected

"Dynamically update DNS and PTR records only if requested by DHCP clients": Selected

"Discard A and PTR records when lease is deleted": Selected

"Dynamically update DNS A and PTR records for DHCP clients that do not request updates (for example, clients running Windows NT 4.0)": Selected
17OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 17 		"Enable DNS dynamic updates according to the settings below": Selected

"Always Dynamically update DNS and PTR records": Selected
19OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 19		"Enable DNS dynamic updates according to the settings below": Selected

"Always Dynamically update DNS and PTR records": Selected

"Dynamically update DNS A and PTR records for DHCP clients that do not request updates (for example, clients running Windows NT 4.0)": Selected
21OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 21		"Enable DNS dynamic updates according to the settings below": Selected

"Always Dynamically update DNS and PTR records": Selected

"Discard A and PTR records when lease is deleted": Selected
23OptionId: 81
Option Value:
Number of Option Elements = 1
Option Element Type = DWORD
Option Element Value = 23		"Enable DNS dynamic updates according to the settings below": Selected

"Always Dynamically update DNS and PTR records": Selected

"Discard A and PTR records when lease is deleted": Selected

"Dynamically update DNS A and PTR records for DHCP clients that do not request updates (for example, clients running Windows NT 4.0)": Selected
For more information, visit the following Web site:
http://technet2.microsoft.com/WindowsServer/en/library/fd1e2fbe-15a6-413b-b712-28afb312c92f1033.mspx?mfr=true

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Keywords: KB945397, kbinfo, kbexpertiseinter, kbhowto

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Article Info
Article ID : 945397
Revision : 3
Created on : 12/12/2007
Published on : 12/12/2007
Exists online : False
Views : 1413