Microsoft KB Archive/136568

= Duplicate Address Errors When Using Synoptics Hubs and DHCP =

Article ID: 136568

Article Last Modified on 2/20/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q136568





SYMPTOMS
You may experience duplicate name errors and have problems obtaining IP addresses from Dynamic Host Configuration Protocol (DHCP) servers if you have Synoptics hubs on the network.



CAUSE
Synoptics hubs can be configured to use BOOTP to communicate configuration information. The BOOTP broadcasts made by the hubs and the server used to configure the hubs interfere with Windows NT DHCP. These hubs can lease IP addresses from the DHCP server causing duplicate name errors and preventing clients from obtaining addresses. The event log on the DHCP server may also show the following error:

Event ID: 1011

Source: DHCP Server

Description: The DHCP Server issues a NACK to the client (MAC address) for the address (IP address) request.

If a Synoptics hub is causing the error, the MAC address in the above error will be unusually long, for example:

003C5DC601534D526F73736932

The MAC address in the error message above usually contains 22 digits, not 26 digits. For example, if you have 0018399D0100AA00A3F079, the first four hexadecimal numbers are the subnet address that the DHCP packet originates on. When you convert "00 18 39 9d" to decimal and invert it, the result is 157.57.24.0. The last twelve digits are the MAC address (00AA00A3F079).



RESOLUTION
To work around this problem, disable the BOOTP functionality on the Synoptics hubs and configuration servers and use the TFTP functionality instead.

To correct this problem, contact Bay Networks Technical Support at (800) 252-6926 to obtain a firmware fix.

Additional query words: prodnt lease router hub dhcpnack

Keywords: kbnetwork kb3rdparty KB136568

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