TCP/IP Data Structures

The INTERFACE_INFO structure is used in conjunction with the SIO_GET_INTERFACE_LIST ioctl command. It is defined in Ws2tcpip.h file and is reproduced here.

typedef struct _INTERFACE_INFO
{
    u_long             iiFlags;             /* Type and status of the interface */
    struct sockaddr    iiAddress;           /* Interface address */
    struct sockaddr    iiBroadcastAddress;  /* Broadcast address */
    struct sockaddr    iiNetmask;           /* Network mask */
} INTERFACE_INFO;

Members

iiFlags

A bitmask describing the status of the interface. The following flags are possible.

Flag	Meaning
IFF_UP	The interface is running.
IFF_BROADCAST	The broadcast feature is supported.
IFF_LOOPBACK	The loopback interface is running.
IFF_POINTTOPOINT	The interface is using point-to-point link.
IFF_MULTICAST	The multicast feature is supported.

iiAddress

The address of the interface.

iiBroadcastAddress

The broadcast address of the interface or the address of the other side for point-to-point links.

iiNetmask

The netmask used by the interface.