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SetIpNetEntry function

The SetIpNetEntry function modifies an existing ARP entry in the ARP table on the local computer.


DWORD SetIpNetEntry(
  _In_ PMIB_IPNETROW pArpEntry


pArpEntry [in]

A pointer to a MIB_IPNETROW structure. The information in this structure specifies the entry to modify and the new information for the entry. The caller must specify values for all members of this structure.

Return value

If the function succeeds, the return value is NO_ERROR.

If the function fails, the return value is one of the following error codes.

Return codeDescription

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).


The pArpEntry parameter is NULL, or SetIpNetEntry is unable to read from the memory pointed to by pArpEntry, or one of the members of the MIB_IPNETROW structure is invalid.


The IPv4 transport is not configured on the local computer.


Use FormatMessage to obtain the message string for the returned error.



On Windows Vista and later , the SetIpNetEntry function can only be called by a user logged on as a member of the Administrators group. If SetIpNetEntry 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 SetIpNetEntry 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.

Note  On Windows NT 4.0 and Windows 2000 and later, this function executes a privileged operation. For this function to execute successfully, the caller must be logged on as a member of the Administrators group or the NetworkConfigurationOperators group.


Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]







See also

IP Helper Start Page
IP Helper Function Reference



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