DOCUMENT:Q130119 25-SEP-2001 [crossnet] TITLE :DHCP Requests Not Returned by TokenRing Routers PRODUCT :Windows for Workgroups and Windows NT Networking Issues PROD/VER::3.11,3.5 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 3.5 - Microsoft Windows NT Server version 3.5 - Microsoft Windows for Workgroups version 3.11 - Microsoft TCP/IP-32 for Windows for Workgroups ------------------------------------------------------------------------------- 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 : Technology : kbWinNTsearch kbWinNTWsearch kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTSsearch kbWinNTS350 kbWinNTS350search kbAudDeveloper kbTCPIPSearch kbWFWSearch kbZNotKeyword3 kbWFW311 Version : :3.11,3.5 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.