Packets Are Sent Without Source Routing Information Even If ArpAlwaysSourceRoute Is Set (311734)

SYMPTOMS

When the ArpAlwaysSourceRoute registry value is set, all packets that are sent by using a Token Ring interface should contain source routing information. Occasionally, however, packets without source routing information may be transmitted, even if ArpAlwaysSourceRoute is set. This may cause computers that receive these packets to lose connectivity because they may update their cache and send subsequent return traffic without source routing information.

Transmitting Token Ring traffic without source routing information when it is required results in packets not reaching their destinations, TCP/IP time-outs, and dropped TCP/IP connections.

CAUSE

A change in Windows 2000 Service Pack 1 introduced a new code path that did not check for ArpAlwaysSourceRoute before transmitting a packet. This new code path has been modified to use the ArpAlwaysSourceRoute value and send packets with the correct source routing information if ArpAlwaysSourceRoute is set.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:

   Date         Time   Version         Size     File name
   ---------------------------------------------------------
   26-Sep-2001  19:11  5.00.2195.3951  121,936  Afd.sys
   13-Nov-2001  14:04  5.00.2195.3952  106,256  Msafd.dll
   13-Nov-2001  14:01  5.00.2195.4632  312,720  Tcpip.sys
   30-Jul-2001  19:15  5.00.2195.3988   16,240  Tdi.sys
   13-Nov-2001  14:04  5.00.2195.3649   17,680  Wshtcpip.dll

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.

MORE INFORMATION

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes