MAC Adresse einer IP ermitteln

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[DllImport("iphlpapi.dll")]
public static extern int SendARP(int DestIP, int SrcIP, [Out] byte[] pMacAddr, ref int PhyAddrLen);

/// <summary>
/// Requests the MAC address using Address Resolution Protocol
/// </summary>
/// <param name="IP">The IP.</param>
/// <returns>the MAC address</returns>
private string RequestMACAddress(string IP)
{
    IPAddress addr = IPAddress.Parse(IP);
    byte[] mac = new byte[6];
    int length = mac.Length;
    SendARP((int)addr.Address, 0, mac, ref length);
    string macAddress = BitConverter.ToString(mac, 0, length);
    return macAddress;
}