Manage IP addresses with AddIPAddress, DeleteIPAddress

The AddIPAddress function adds the specified IPv4 address to the specified adapter. The DeleteIPAddress function deletes the specified IPv4 address from the specified adapter. These functions can be used to add and delete IPv4 addresses to a network adapter.

An IPv4 address added by the AddIPAddress function is not persistent. The IPv4 address exists only as long as the adapter object exists. Restarting the computer destroys the IPv4 address, as does manually resetting the network interface card (NIC).

After AddIPAddress has been called successfully, DHCP will be disabled for the IP address that was added. Therefore, functions such as IpReleaseAddress, which require DHCP to be enabled, will not be functional on the added IP address. The DeleteIPAddress function can be used to delete the added IPv4 address.

Note

Group policies, enterprise policies, and other restrictions on the network may prevent these functions from completing successfully. Ensure that the application has the necessary network permissions before attempting to use these functions.

 

To use AddIPAddress

1. Declare ULONG variables named NTEContext and NTEInstance, both initialized to zero.

   Note

   The NTEContext variable is the only parameter to the DeleteIPAddress function; to delete the IP address that is added, NTEContext must be stored and unchanged.

    

       ULONG NTEContext = 0;
       ULONG NTEInstance = 0;
   
   

   Note

    

2. Declare variables for the IPAddr and IPMask structures named iaIPAddress and iaIPMask, respectively. These values are simply unsigned integers. Initialize the iaIPAddress and iaIPMask variables using the inet_addr function.

   UINT iaIPAddress;
   UINT iaIPMask;
   
   iaIPAddress = inet_addr("192.168.0.5");
   iaIPMask    = inet_addr("255.255.255.0");
   

3. Call the AddIPAddress function to add the IPv4 address. Check for errors and return the error value to the DWORD variable dwRetVal (for more extensive error checking).

   dwRetVal = AddIPAddress(iaIPAddress, iaIPMask, pIPAddrTable->table[0].dwIndex, 
                                &NTEContext, &NTEInstance);
   if (dwRetVal != NO_ERROR) {
       printf("AddIPAddress call failed with %d\n", dwRetVal);
   }
   

   Note

   The third parameter is the adapter index, which can be obtained by calling the GetIpAddrTable function. It is assumed that the variable returned by this function is named pIPAddrTable. For help with the GetIpAddrTable function, see Managing IP Address Using GetIpAddrTable.

    

To use DeleteIpAddress

• Call the DeleteIPAddress function, passing the NTEContext variable as its parameter. Check for errors and return the error value to the DWORD variable dwRetVal (for more extensive error checking).

  dwRetVal = DeleteIPAddress(NTEContext);
  if (dwRetVal != NO_ERROR) {
          printf("\tDeleteIPAddress failed with error: %d\n", dwRetVal);
  } 
  

Note

To use DeleteIPAddress, AddIPAddress must first be called to get the handle NTEContext. The previous procedure assumes that AddIPAddress has already been called somewhere in the code, and NTEContext has been saved and remains uncorrupted.

 

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