2.2.1.2.23 MIB_BEST_IF
The MIB_BEST_IF structure stores the index of the interface that has the best route to a specific destination IPv4 address.
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typedef struct _MIB_BEST_IF { DWORD dwDestAddr; DWORD dwIfIndex; } MIB_BEST_IF, *PMIB_BEST_IF;
dwDestAddr: Specifies the IPv4 address of the destination address.
dwIfIndex: Specifies the index of the interface that has the best route to the destination address specified by the dwDestAddr member.