private boolean hasIPAddress(ARPPacket packet, byte[] ipAddress){
		byte[] thatIp = packet.sender_protoaddr;
		if (ipAddress.length != thatIp.length)
			return false;
		for (int i = 0; i < thatIp.length; i++){
			if (ipAddress[i] != thatIp[i])
				return false;
		}
		return true;
	}