private void setIcmpHeader(PacketWrapper packetWrapper) {
    Packet packet = packetWrapper.getPacket();
    int startByte = packetWrapper.getStartByte();
    byte[] rawPacket = packet.getRawData();
    this.icmpHeader = Arrays.copyOfRange(rawPacket, startByte, startByte + IcmpHeader.TOTAL_HEADER_LENGTH);