Increasing DefaultTTL in Registry Has No Effect (127827)
The information in this article applies to:
- Microsoft Windows NT Workstation 3.5
- Microsoft Windows NT Server 3.5
This article was previously published under Q127827 SYMPTOMS
By default, the DefaultTTL setting in the Windows NT registry under
HKEY_LOCAL_MACHINE\SYSTEM\CURRENTCONTROLSET\SERVICES\TCPIP\PARAMETERS
is 32 decimal. If this value is changed to anything above 32, the Default
Time to Live value is unaffected. Packets will not reach a remote
destination.
If you have a destination that Tracert shows is 41 hops away and the
default TTL is 32, packets will not reach the destination. If you
change the default TTL on the ping command line to 45, by using the -i
switch, the packets will make it to the destination.
This problem occurs only with the PING utility because it is hard coded to
use 32 for the TTL. Other utilities, like Telnet and FTP, use the correct
registry TTL value. For Ping utility, "-i" switch can be used to specify a
different TTL.
STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.5. We
are researching this problem and will post new information here in the
Microsoft Knowledge Base as it becomes available.
| Modification Type: | Major | Last Reviewed: | 10/30/2003 |
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| Keywords: | KB127827 |
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