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FlushIpNetTable2 function

The FlushIpNetTable2 function flushes the IP neighbor table on the local computer.

Syntax


NETIOAPI_API FlushIpNetTable2(
  _In_  ADDRESS_FAMILY  Family,
  _In_  NET_IFINDEX InterfaceIndex
);

Parameters

Family [in]

The address family to flush.

Possible values for the address family are listed in the Winsock2.h header file. Note that the values for the AF_ address family and PF_ protocol family constants are identical (for example, AF_INET and PF_INET), so either constant can be used.

On the Windows SDK released for Windows Vista and later, the organization of header files has changed and possible values for this member are defined in the Ws2def.h header file. Note that the Ws2def.h header file is automatically included in Winsock2.h, and should never be used directly.

The values currently supported are AF_INET, AF_INET6, and AF_UNSPEC.

ValueMeaning
AF_UNSPEC
0

The address family is unspecified. When this parameter is specified, this function flushes the neighbor IP address table containing both IPv4 and IPv6 entries.

AF_INET
2

The Internet Protocol version 4 (IPv4) address family. When this parameter is specified, this function flushes the neighbor IP address table containing only IPv4 entries.

AF_INET6
23

The Internet Protocol version 6 (IPv6) address family. When this parameter is specified, this function flushes the neighbor IP address table containing only IPv6 entries.

 

InterfaceIndex [in]

The interface index. If the index is specified, flush the neighbor IP address entries on a specific interface, otherwise flush the neighbor IP address entries on all the interfaces. To ignore the interface, set this parameter to zero.

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
ERROR_ACCESS_DENIED

Access is denied. This error is returned 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).

ERROR_INVALID_PARAMETER

An invalid parameter was passed to the function. This error is returned if the Family parameter was not specified as AF_INET, AF_INET6, or AF_UNSPEC.

ERROR_NOT_SUPPORTED

The request is not supported. This error is returned if no IPv4 stack is on the local computer and AF_INET was specified in the Family parameter. This error is also returned if no IPv6 stack is on the local computer and AF_INET6 was specified in the Family parameter. This error is also returned on versions of Windows where this function is not supported.

Other

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

 

Remarks

The FlushIpNetTable2 function is defined on Windows Vista and later.

The FlushIpNetTable2 function flushes or deletes the neighbor IP addresses on a local system. The Family parameter can be used to limit neighbor IP addresses to delete to a particular IP address family. If neighbor IP addresses for both IPv4 and IPv6 should be deleted, set the Family parameter to AF_UNSPEC. The InterfaceIndex parameter can be used to limit neighbor IP addresses to delete to a particular interface. If neighbor IP addresses for all interfaces should be deleted, set the InterfaceIndex parameter to zero.

The Family parameter must be initialized to either AF_INET, AF_INET6, or AF_UNSPEC.

The FlushIpNetTable2 function can only be called by a user logged on as a member of the Administrators group. If FlushIpNetTable2 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. This 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.

Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Netioapi.h (include Iphlpapi.h)

Library

Iphlpapi.lib

DLL

Iphlpapi.dll

See also

CreateIpNetEntry2
DeleteIpNetEntry2
GetIpNetEntry2
GetIpNetTable2
MIB_IPNET_ROW2
MIB_IPNET_TABLE2
ResolveIpNetEntry2
SetIpNetEntry2

 

 

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