SendARP Function

The SendARP function sends an Address Resolution Protocol (ARP) request to obtain the physical address that corresponds to the specified destination IPv4 address.
Syntax
C++

DWORD SendARP(
__in IPAddr DestIP,
__in IPAddr SrcIP,
__out PULONG pMacAddr,
__inout PULONG PhyAddrLen
);



Requirements
Minimum supported client Windows 2000 Professional
Minimum supported server Windows 2000 Server
Header Iphlpapi.h
Library Iphlpapi.lib
DLL Iphlpapi.dll

в мсдне есть и пример