Microsoft KB Archive/130119

= DHCP Requests Not Returned by TokenRing Routers =

Article ID: 130119

Article Last Modified on 12/5/2003

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows for Workgroups 3.11
 * Microsoft TCP/IP-32 for Windows for Workgroups 1.0

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This article was previously published under Q130119



SYMPTOMS
Computers running Windows for Workgroups and TCP/IP-32 for Windows for Workgroups, and computers running Windows NT and TCP/IP may fail to obtain DHCP addresses in a routed TokenRing environment. Routers functioning as a 1542 BootP relay agents in a TokenRing environment forward the request to the DHCP server, however when the server replies back to the client, routers (including the Proteon CNX500 router), may fail to forward the packet due to the htype field in the packet. Many routers do not check the htype field and forward packets allowing the workstation to receive the servers response.



CAUSE
The Hardware Type (htype) is filled out incorrectly by the client. The type should be 6 (IEEE 802 Networks), by RFC. However, protocol analyzer traces will show (htype) = 1 (0x1) 10 MB Ethernet even on a workstation configured with a TokenRing network adapter.



RESOLUTION
Obtain and install the fix mentioned below.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.5 and TCPIP-32 for Windows for Workgroups versions 3.11 and 3.11a. This problem was corrected in Windows NT 3.51 as well as TCPIP-32 for WFW 3.11b included on the Windows NT 3.51 compact disc.

The third-party products discussed here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: 3.11 prodnt prodtcp32

Keywords: KB130119

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