Multicast Packets with a TTL Setting of 0 Are Transmitted by the Windows 2000 TCP/IP Stack and the Windows XP TCP/IP Stack (301453)

SYMPTOMS

When you have a program that sends IP multicasts with a time-to-live (TTL) setting of 0 (zero) to communicate with other local programs, multicasts with a TTL setting of 0 should not be transmitted on the network (they should only be looped back to other programs in the local computer). However, if you monitor network traffic you see that IP multicasts with a TTL setting of 0 are transmitted on the network. This may cause the network to become overloaded.

RESOLUTION

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Windows 2000

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
   ---------------------------------------------------------
   27-Jul-2001  01:04  5.00.2195.3951  118,864  Afd.sys
   03-Aug-2001  12:17  5.00.2195.3952  105,232  Msafd.dll
   27-Jul-2001  06:01  5.00.2195.3958  312,496  Tcpip.sys
   30-Jul-2001  20:15  5.00.2195.3988   16,240  Tdi.sys
   03-Aug-2001  12:17  5.00.2195.3649   17,680  Wshtcpip.dll

Windows XP

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

   Date         Time   Version             Size   File name
   --------------------------------------------------------------
   04-Dec-2001  12:02  5.1.2600.21       318,080  Tcpip.sys

MORE INFORMATION

For additional information about dialup networking and Windows 2000, click the article number below to view the article in the Microsoft Knowledge Base:

311935 Multicasts with a TTL Setting of Zero Are Transmitted on the Network

For additional information multicast packets and Microsoft Windows 98, Microsoft Windows 98 Second Edition, and Microsoft Windows Millenium Edition, click the article number below to view the article in the Microsoft Knowledge Base:

329128 Multicast Packets with TTL=0 Transmitted by Windows 98 and Windows Millenium Edition

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