DOCUMENT:Q183902 09-AUG-2001 [crossnet] TITLE :Dead Gateway Detection Is Not Triggered During Logon PRODUCT :Windows for Workgroups and Windows NT Networking Issues PROD/VER:WINDOWS:95; winnt:3.5,3.51,4.0 OPER/SYS: KEYWORDS:kbnetwork ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 3.5, 3.51, 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft Windows NT Workstation versions 3.5, 3.51, 4.0 - Microsoft Windows 95 ------------------------------------------------------------------------------- SYMPTOMS ======== A Windows 95-based or Windows NT-based computer that is configured with multiple default gateways may be unable to connect to its logon server when the computer starts. CAUSE ===== If the first default gateway is unavailable, the logon process does not trigger dead gateway detection. Without a domain controller on the local network segment, you are unable to log on to the domain. RESOLUTION ========== To resolve this issue, use one of the following methods: - Install and configure a domain controller on the local network segment. - Install a routing protocol on your Windows NT-based computer, such as Routing Information Protocol (RIP) for Transmission Control Protocol/Internet Protocol (TCP/IP) on Windows NT Server or Silent RIP for Windows NT Workstation. For more information, please see the following articles in the Microsoft Knowledge Base: Q172514 Silent RIP for IP Available for Windows NT Workstation Q169161 Registry Parameters for RIP for IP version 1 NOTE: Silent RIP is not available for Windows 95. - For Windows NT, Windows 95, and Windows 98-based computers, you can enable the Internet Control Message Protocol (ICMP) Internet Router Discovery Protocol (IRDP) packets on all of your routers. The following text is an excerpt from Request for Comments (RFC) 1256: The ICMP router discovery messages are called "Router Advertisements" and "Router Solicitations. " Each router periodically multicasts a Router Advertisement from each of its multicast interfaces, announcing the IP address(es) of that interface. Hosts discover the addresses of their neighboring routers simply by listening for advertisements. This is one way of testing for dead gateways. This solution requires that routers be configured to send IRDP packets, but currently has not been implemented in Windows NT 4.0. Windows 95 requires a Windows Socket update 2, while Windows 98 natively supports IRDP. For additional information, please see the following article(s) in the Microsoft Knowledge Base: Q182108 Availability of Windows Sockets 2.0 for Windows 95 For additional information, please see the following article(s) in the Microsoft Knowledge Base: Q223756 IRDP Client Support Added to Windows NT 4.0 MORE INFORMATION ================ Switching to the second gateway occurs only if there is already an existing connection-oriented TCP session over the route to the first configured gateway. Connectionless datagram-based traffic such as an ICMP or Network Basic Input/Output System (NetBIOS) packet does not trigger the change to a secondary gateway. For more information, please see the following articles in the Microsoft Knowledge base: Q128978 Dead Gateway Detection in TCP/IP for Windows NT Q171564 TCP/IP Dead Gateway Detection Algorithm Updated for Windows NT You can obtain additional information from RFC 816, "Fault Isolation and Recovery." For information about obtaining RFCs, please see the following article in the Microsoft Knowledge Base: Q185262 How to Obtain Request for Comments Documents from the Internet Additional query words: ====================================================================== Keywords : kbnetwork Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT351search kbWinNT350search kbWinNT400search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search kbWin95search kbZNotKeyword3 Version : WINDOWS:95; winnt:3.5,3.51,4.0 Issue type : kbprb ============================================================================= 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.