Abstract:
The present invention relates to a network management system for analyzing Internet application traffic. An apparatus for Internet application traffic classification benchmark according to the present invention configures two or more Internet application traffic classifications in plug-in scheme to perform a benchmarking function for the performance of each Internet application traffic classification. The apparatus can provide an objective and accurate evaluation for each classification technology by aggregating various Internet application traffic classification technologies by the plug-in scheme.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority under 35 U.S.C. §119 to Korean Patent Application No. 10-2009-98817, filed on Oct. 16, 2009, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to a network management system for analyzing Internet application traffic, and more particularly, to a technology capable of rapidly analyzing Internet traffic conditions and fairly evaluating Internet application traffic identification and classification technologies by benchmarking various known Internet application traffic identification and classification technologies. 
       BACKGROUND 
       [0003]    In recent years, with the rapid increase of Internet use, Internet service suppliers, researchers, and administrators require a system capable of checking network conditions rapidly and accurately. 
         [0004]    Therefore, various Internet application traffic identification and classification systems are proposed. 
         [0005]    There are some known traffic classification systems, which include port-based classification, Deep Packet (Payload) Inspection (DPI), host-behavioral classification, and statistical approaches based on machine learning. 
         [0006]    In the early Internet, the traffic classification largely relied on the use of transport layer port numbers. Port-based classification has been found to be less reliable since many applications hide their identity by masquerading ports and/or by using well-known ports of other application. 
         [0007]    DPI technique looks at the packet payload to classify traffic as many applications write their signatures in the first few bytes in the payload. Given a set of unique payload signatures, DPI is more reliable and accurate. DPI is resource-intensive and futile on encrypted traffic. Additionally, DPI causes privacy and legal concerns. 
         [0008]    Host-behavioral classifications inspect “social interaction” for classification. It shows excellent performance in identification and classification of viruses and worms that the known methods cannot easily handle, but is low in accuracy due to heuristic-based classification. 
         [0009]    Machine learning-based method has comparatively high accuracy and a rapid execution time, but has classification and identification accuracy which depends on application traffic itself. 
         [0010]    As described above, since the performances of the Internet application traffic identification and classification systems are limitatively evaluated, it is difficult to determine the type of the traffic classification method executable with the best performance, suitability of traffic analysis, and verification of reliability while a fair and objective evaluation reference is not provided at the time of applying each traffic classification method. 
       SUMMARY 
       [0011]    An apparatus for network traffic classification benchmark of the present invention configures two or more Internet application traffic classifications in plug-in scheme to perform a benchmark function for the performance of each Internet application traffic classification. 
         [0012]    In a general aspect of the present invention, an apparatus for network traffic classification benchmark, comprises: a user interface inputting Internet application traffic trace data of a user constituted by on-line traffic through a network interface card (NIC) and off-line traffic through a Raw file stored in a local or a remote disk, and providing computation data computed by performance evaluation and classification result of a Internet application traffic classification; a pre/post-processor connected with the user interface to convert the input data into a format suitable for each of a plurality of classification plug-ins, and compare and evaluate the performances of the plug-ins; a traffic classifier connected with the pre/post-processor to manage and execute each plug-in configured to each network traffic classification; and a storage connected with the user interface and the traffic classifier to store performance analysis results depending on an execution of the plug-in, wherein the classifier includes, a classification execution unit identifying and classifying applications related to transaction flow; a plug-in management unit connected with the classification execution unit to allocate two or more network traffic classifications to the plug-ins, and to add, modify, and remove the plug-in; and a database management unit connected with the plug-in management unit to manage data of the storage and enable storing or accessing a plurality of records sequentially or randomly. 
         [0013]    Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]      FIG. 1  is a diagram showing a structure of an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention; 
           [0015]      FIG. 2  is a diagram showing a detailed structure of a user interface of an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention; 
           [0016]      FIG. 3  is a diagram showing a detailed structure of a pre/post-processor of an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention; 
           [0017]      FIG. 4  is a diagram showing a detailed structure of a classification unit of an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention; 
           [0018]      FIG. 5  is a diagram showing a detailed structure of a storage of an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention; and 
           [0019]      FIG. 6A  through  FIG. 6C  are a flowchart of an overall system of an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0020]    Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals will be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience. The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. Accordingly, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be suggested to those of ordinary skill in the art. Also, descriptions of well-known functions and constructions may be omitted for increased clarity and conciseness. 
         [0021]    Hereinafter, an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention will be described in detail. 
         [0022]    In the Internet application traffic classification and benchmarks framework according to the exemplary embodiment of the present invention, two or more Internet application traffic classification methods are configured in plug-in scheme and a benchmark function for each Internet application traffic classification method is performed. 
         [0023]      FIG. 1  is a diagram showing a structure of an Internet application traffic classification and benchmarks framework according to an exemplary embodiment of the present invention and includes a user interface  1 , a pre/post-processor  3 , a traffic classifier  5 , and a storage  7 . 
         [0024]    The user interface  1  serves to provide operation data computed from evaluation and classification results of the performance of an Internet application traffic classification method depending on user&#39;s input of Internet application traffic trace data and includes an input unit  11 , and an output unit  15  as shown in  FIG. 2 . 
         [0025]    The input unit  11  serves to input analysis data by capturing the Internet application traffic trace data constituted by two kinds of Internet application traffic trace data  9  such as online traffic  91  through a network interface card (NIC) and offline traffic  93  through a raw file stored in a local or a remote disk like an overall flowchart shown in  FIG. 6A  through  FIG. 6C . 
         [0026]    Further, the input unit  11  according to the exemplary embodiment of the present invention includes a transaction unit  13  that is configured in a transaction scheme in which input data is separated into an object constituted by a session, a task, a time stamp, and an analysis result. 
         [0027]    Since each Internet application traffic classification method should process a set of Internet application traffic trace data of a large amount, system efficiency depends on a data operation unit. 
         [0028]    The Internet application traffic classification and benchmarks framework according to the exemplary embodiment of the present invention identifies and classifies the Internet application traffic by the transaction unit separated into a basic operation unit in order to provide a smooth operation function within limited resources of a CPU and a memory. 
         [0029]    In the exemplary embodiment of the present invention, the basic operation unit is separated into a compact object constituted by a session and tasks defined JAVA, a time stamp, and an analysis result, that is, a transaction. 
         [0030]    The session  131  is defined as a record set associated with an Internet application traffic flow captured for a unit time (five minutes in the exemplary embodiment of the present invention). 
         [0031]    Each record of the session includes information associated to the Internet application traffic flow including an IP, a port, and a protocol, a space allocated to each plug-in for recording a classification result, and a descriptor of the session. 
         [0032]    The tasks  133  are defined as a batch of the plug-in which can be executed while the Internet application traffic classification and benchmarks framework according to the exemplary embodiment of the present invention operates. 
         [0033]    The time stamp is defined as a unique identifier of the transaction in which a system time is recorded at the time of generating the transaction. 
         [0034]    The analysis result includes accuracy and efficiency of each plug-in as a result of a benchmark of a plug-in which is scheduled to be executed. 
         [0035]    All stems according to the exemplary embodiment of the present invention are stored in a database as a single table. 
         [0036]    By applying such a transaction concept, collection and separation are available by the flow of a large amount from a single or multiple source trace, an analysis transaction can be reloaded without an additional computation operation, and the extensibility of a classification system can be provided. 
         [0037]    The analysis data inputted by the input unit  11  is transferred to a pre-processing unit  31  of the pre/post-processing unit  3 . 
         [0038]    The pre/post-processor  3  includes the pre-processing unit  31  and a post-processing unit  35  as shown in  FIG. 3  and the pre-processing unit  31  serves to convert the input data of the input unit  11  into a format for each classification plug-in and includes an input format converting unit  313 , a feature selecting unit  311 , and a feature discretizing unit  315 . 
         [0039]    The input format converting unit  313  is connected with the input unit  11  and serves to convert an input format of the plug-in. 
         [0040]    That is, a record in the transaction table is required to be extracted or updated in order to convert the transaction into input formats of a plurality of plug-ins (i.e., an .AREF format for WEKA which is the machine learning-based application traffic classification method). 
         [0041]    The input format converting procedure can be implemented by a configuration linking an input stream of each plug-in and an output stream of the database with each other. 
         [0042]    The feature selection unit  311  is connected with the input format converting unit  313  and serves to select the feature of the Internet application traffic flow to be used for machine learning. Since the performance of a machine learning-based Internet application traffic classification algorithm is generally influenced by deliberately selecting the feature, the feature selecting unit  311  preferably selects a feature that has the most influence on accuracy. 
         [0043]    Therefore, the feature is arbitrarily selected according to a user&#39;s intention through a conditional selection statement implemented by 37 basic features in the exemplary embodiment of the present invention. 
         [0044]    The feature discretizing unit  315  is connected to the input format converting unit  313  and serves to discretize data. 
         [0045]    The data discretization is defined as a process transitioning continuous data into discrete data. 
         [0046]    The data processed by the pre-processing unit  31  is transferred to the traffic classifier  5 . 
         [0047]    The traffic classifier  5  manages and executes a plug-in configured by each Internet application traffic classification method and as shown in  FIG. 4 , is generally constituted by a classification execution unit  51 , a plug-in management unit  55 , and a database management unit  53 . 
         [0048]    The classification execution unit  51  identifies and classifies an application related with an Internet application traffic flow record of each transaction. 
         [0049]    In order to perform these functions, each plug-in is loaded and executed in a task of the transaction in accordance with a predetermined order. In a preprocessed transaction, each plug-in is executed under a control by the plug-in management unit  55  through the connection between the plug-in and the database management unit  53 . 
         [0050]    The plug-in management unit  55  is connected with the classification execution unit  51  to allocate the classification technologies and facilitate the addition, modification, and removal of the plug-in. 
         [0051]    More specifically, the plug-in management adds a new technology to an object for classification or bench-mark and reconfigures classification technologies added according to a user&#39;s purpose. The plug-in management takes charge of all allocation operations for the classification technologies. 
         [0052]    In the exemplary embodiment of the present invention, the plug-in management is implemented by JAVA and a class-based data structure is processed as a plug-in name, details of the plug-in, a plug-in execution parameter, and an executable library link. 
         [0053]    Furthermore, all plug-in management functions are supported by the user interface in order to improve usability to enable the user to add, modify, and remove the plug-in in a semi-automated scheme through a simple operation. 
         [0054]    The database management unit  53  is connected with the plug-in management unit  55  to manage the data of the storage and enable sequential access or random access to a lot of records. 
         [0055]    An operation processed by the transaction of the Internet application traffic classification and benchmarks framework according to the exemplary embodiment of the present invention requires a lot of consumption resources such as a memory, a disk space, and the like. Therefore, when the transaction is configured in the exemplary embodiment of the present invention, each Internet application traffic flow in the session is stored as a relevant single record of the transaction table of the database management unit and all data such as the space allocated to each plug-in, the session descriptor, and the like are included in the transaction table in order to record flow information and a classification result. 
         [0056]    The data processed by the traffic classifier  5  is transferred to the post-processing unit  35  of the pre/post-processor  3 . 
         [0057]    The post-processing unit  35  evaluates the transaction accurately classified for each plug-in and includes a visualization unit  351 , an output format converting unit  353 , and an evaluation unit  355 . 
         [0058]    The visualization unit  351  visualizes the classification result of the traffic classifier  5 . 
         [0059]    The output format converting unit  353  is connected with the visualization unit  351  to convert the analyzed transaction into a visualized format. 
         [0060]    The evaluation unit  355  is connected with the output format converting unit  355  to evaluate the analyzed transaction by using performance metric for each plug-in. 
         [0061]    The Internet application traffic classification and benchmarks framework according to the exemplary embodiment of the present invention employs a benchmark methodology enabling the comparison of a plurality of Internet application traffic classification technologies. In order to implement the benchmark system, first, the transaction should be evaluated by using an objective and accurate performance metric, second, a complete payload data set should be used, and third, a wide-range application category should be defined. 
         [0062]    In the exemplary embodiment of the present invention, the performance metric uses four metrics, i.e., overall accuracy, precision, recall, and F-measure in order to measure the performance of each Internet application traffic classification technology. 
         [0063]    The performance metrics may be defined as true positive (TP), false positive (FP), true negative (TN), and false negative (FN). 
         [0064]    The true positive (TP) is defined by the number of Internet application traffic flows accurately classified for a predetermined application, the false positive (FP) is defined by the number of Internet application traffic flows inaccurately belonging to a given application, the true negative (TN) is defined by the number of Internet application traffic flows accurately classified into another application, and the false negative (FN) is defined by the number of Internet application traffic flows inaccurately classified into another application. 
         [0065]    More specifically, it will be identified whether or not the Internet application traffic flow is a predetermined application. For example, it will be identified whether or not the relevant application of the Internet application traffic flow called A is web. 
         [0066]    In the case in which the Internet application traffic flow A is actually the web, when the Internet application traffic classification method classifies the application related to the flow A as the ‘web’, this is determined as the true positive (TP). However, when the Internet application traffic classification method classifies the application related to the flow A as not the ‘web’, this is determined as the false negative (FN). 
         [0067]    Contrary to this, in the case in which the Internet application traffic flow A is not actually the web, when the Internet application traffic classification method classifies the application related to the flow A as the ‘web’, this is determined as the false positive (FP). However, when the Internet application traffic classification method classifies the application related to the flow A as not the ‘web’, this is determined as the true negative (TN). 
         [0068]    The overall accuracy represents the accuracy of the plug-in for the entire trace set and represents a ratio of the sum of overall true positive to the sum of the overall true positive (TP) and the false positive (FP) for all classes, and is defined by the following equation: 
         [0000]    
       
         
           
             
               
                 
                   
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                     measure 
                   
                   = 
                   
                     
                       2 
                        
                       XaccuracyX 
                        
                       
                           
                       
                        
                       recall 
                     
                     
                       ( 
                       
                         accuracy 
                         + 
                         recall 
                       
                       ) 
                     
                   
                 
               
               
                 
                   [ 
                   
                     Equation 
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                      
                     1 
                   
                   ] 
                 
               
             
           
         
       
     
         [0069]    The precision as the performance metric of the Internet application traffic classification method for a predetermined Internet application category is calculated by a ratio of the true positive (TP) to the sum of the true positive (TP) and the false positive (FP) among the Internet application traffic flows and may be expressed by the following equation: 
         [0000]    
       
         
           
             
               
                 
                   Accuracy 
                   = 
                   
                     TP 
                     
                       TP 
                       + 
                       FP 
                     
                   
                 
               
               
                 
                   [ 
                   
                     Equation 
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         [0070]    The recall as the performance metric of the Internet application traffic classification method for a predetermined Internet application category is calculated by a ratio of the true positive (TP) to the sum of the true positive (TP) and the false negative (FN) among the Internet application traffic flows and may be expressed by the following equation: 
         [0000]    
       
         
           
             
               
                 
                   Recall 
                   = 
                   
                     TP 
                     
                       TP 
                       + 
                       FN 
                     
                   
                 
               
               
                 
                   [ 
                   
                     Equation 
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                     3 
                   
                   ] 
                 
               
             
           
         
       
     
         [0071]    The F-measure considers the precision and the recall by taking a harmonic means and as metric widely used in retrieving and classifying information, may be expressed by the following equation: 
         [0000]    
       
         
           
             
               
                 
                   
                     F 
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                     measure 
                   
                   = 
                   
                     
                       2 
                        
                       XaccuracyXrecall 
                     
                     
                       ( 
                       
                         accuracy 
                         + 
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                   [ 
                   
                     Equation 
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         [0072]    Since the evaluation result processed by the post-processing unit  35  is stored in the storage  7 , the evaluation result may be queried by a query unit  155  of the output unit  15 . 
         [0073]    In the query method in the exemplary embodiment of the present invention, since all Internet application traffic flow records are stored in the storage  7  when the transaction is generated, important information including a key IP address, and the like may be queried by only a small overhead. 
         [0074]    In the exemplary embodiment of the present invention, the output unit  15  includes a statistics unit  151 , a behavioral pattern of the host may be verified by a graph module and the overall precision for each plug-in may be verified. 
         [0075]    Further, the output unit  15  includes a determination unit  153  and may provide a plurality of determination processes by voting the priority of the performance of the Internet traffic classification method. 
         [0076]    According to the exemplary embodiment of the present invention, in the priority voting algorithm, a priority value may be configurable in order to adjust the voting algorithm. 
         [0077]    As set forth above, according to an exemplary embodiment of the present invention, an Internet application traffic classification and benchmarks framework that can provide an accurate network traffic condition analysis result and furthermore, improve the efficiency of operation of an Internet network by integrating various Internet application traffic classification technologies in a plug-in scheme to provide a system capable of objectively and accurately evaluating classification technologies. 
         [0078]    It is possible to complementarily analyze the Internet application traffic by actively utilizing advantages of various Internet application traffic classification technologies and providing a framework having excellent extensibility. 
         [0079]    A number of exemplary embodiments have been described above. Nevertheless, it will be understood that various modifications may be made. For example, suitable results may be achieved if the described techniques are performed in a different order and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Accordingly, other implementations are within the scope of the following claims.