SetIpTTL function (iphlpapi.h)
The SetIpTTL function sets the default time-to-live (TTL) value for the local computer.
IPHLPAPI_DLL_LINKAGE DWORD SetIpTTL( UINT nTTL );
The new TTL value for the local computer.
If the function succeeds, the return value is NO_ERROR.
If the function fails, the return value is one of the following error codes.
||Access is denied. This error is returned on Windows Vista and Windows Server 2008 under several conditions that include the following: the user lacks the required administrative privileges on the local computer or the application is not running in an enhanced shell as the built-in Administrator (RunAs administrator).|
||An invalid parameter was passed to the function. This error is returned if the nTTL parameter is invalid.|
||Use FormatMessage to obtain the message string for the returned error.|
The default TTL can also be set using the SetIpStatistics function.
On Windows Vista and later, the SetIpTTL function can only be called by a user logged on as a member of the Administrators group. If SetIpTTL is called by a user that is not a member of the Administrators group, the function call will fail and ERROR_ACCESS_DENIED is returned.
The SetIpStatistics function can also fail because of user account control (UAC) on Windows Vista and later. If an application that contains this function is executed by a user logged on as a member of the Administrators group other than the built-in Administrator, this call will fail unless the application has been marked in the manifest file with a requestedExecutionLevel set to requireAdministrator. If the application lacks this manifest file, a user logged on as a member of the Administrators group other than the built-in Administrator must then be executing the application in an enhanced shell as the built-in Administrator (RunAs administrator) for this function to succeed.
|Minimum supported client||Windows 2000 Professional [desktop apps only]|
|Minimum supported server||Windows 2000 Server [desktop apps only]|