public EthernetFrame(netHeader.NetPacket pkt)
        {
            _pkt = pkt;
            Utils.memcpy(ref DestinationMAC, 0, pkt.buffer, 0, 6);
            //Console.WriteLine("eth dst MAC :" + DestinationMAC[0] + ":" + DestinationMAC[1] + ":" + DestinationMAC[2] + ":" + DestinationMAC[3] + ":" + DestinationMAC[4] + ":" + DestinationMAC[5]);
            Utils.memcpy(ref SourceMAC, 0, pkt.buffer, 6, 6);
            //Console.WriteLine("src MAC :" + SourceMAC[0] + ":" + SourceMAC[1] + ":" + SourceMAC[2] + ":" + SourceMAC[3] + ":" + SourceMAC[4] + ":" + SourceMAC[5]);

            hlen = 14; //(6+6+12)

            //NOTE: we don't have to worry about the Ethernet Frame CRC as it is not included in the packet

            proto = BitConverter.ToInt16(pkt.buffer, 12);
            switch (proto) //Note, Diffrent Edian
            {
            case (int)EtherFrameType.NULL:
                break;

            case (int)EtherFrameType.IPv4:
                _pl = new IPPacket(this);
                break;

            case (int)EtherFrameType.ARP:
                _pl = new ARPPacket(this);
                break;

            case (int)0x0081:
                //Console.Error.WriteLine("VLAN-tagged frame (IEEE 802.1Q)");
                throw new NotImplementedException();

            //break;
            default:
                Console.Error.WriteLine("Unkown Ethernet Protocol " + proto.ToString("X4"));
                break;
            }
        }
 public EthernetFrame(EthernetPayload ePL)
 {
     hlen = 14;
     _pl  = ePL;
 }