WO2004059914A1 - ネットワーク端末装置、通信過負荷回避方法およびプログラム - Google Patents
ネットワーク端末装置、通信過負荷回避方法およびプログラム Download PDFInfo
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- WO2004059914A1 WO2004059914A1 PCT/JP2003/016437 JP0316437W WO2004059914A1 WO 2004059914 A1 WO2004059914 A1 WO 2004059914A1 JP 0316437 W JP0316437 W JP 0316437W WO 2004059914 A1 WO2004059914 A1 WO 2004059914A1
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- communication
- terminal device
- network terminal
- communication processing
- overload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
- H04L63/1441—Countermeasures against malicious traffic
- H04L63/1458—Denial of Service
Definitions
- the present invention relates to a network terminal device that eliminates an adverse effect due to a communication overload state, and more particularly to a network terminal device that handles video data at home.
- a denial of service attack can be considered.
- DOS denial of service attack
- the communication control device 3 determines the attack source according to the judgment of the network administrator. It is configured to notify the network of communication control instructions and to filter IP (Internet Protocol) packets by the attacking router (attack blocking devices 100 and 200). With such a configuration, a communication overload state is avoided.
- the CPU is occupied by the communication process due to the overload of the communication process, which adversely affects the main processes other than the communication process (video data processing, etc.).
- video data processing requires real-time processing, so it is necessary to completely eliminate the effects of communication overload.
- an object of the present invention is to provide a network terminal device that avoids a communication overload state by itself and does not require a user judgment and an external additional device, and facilitates processing of the main body. Disclosure of the invention
- a network terminal device includes a communication unit that communicates via a network, a determination unit that determines whether communication is overloaded, and a determination result. And invalidating means for invalidating the data received by the communication means when it is determined that an overload condition is present.
- the received data is invalidated in the overload state, so that no judgment by the user and no additional device is required, and the influence on the communication processing and other processing is eliminated even in the overload state of the communication. can do.
- the receiving process does not occupy the processing capability of the CPU, it is possible to continue without deteriorating the quality of other processes. Therefore, it can be easily applied to a network terminal device used in a general home, and other processing can be smoothly performed.
- a network terminal device that processes video data that requires real-time processing may be in a communication overload state. The resulting effects can be eliminated.
- the received data is blocked like a breaker without checking the type and content of the received data. Internal processing can be protected.
- the determination means may be configured to determine that an overload state is present when the amount of received data from the network per unit time exceeds a threshold value.
- the determination means may be configured to determine that there is an overload state when the amount of received data in a receiving buffer that temporarily holds received data exceeds a threshold value.
- the determination means may be configured to make a determination based on the threshold value on received data in communication processing corresponding to a data link layer.
- the load of the threshold determination is not applied more than the network layer.
- the network terminal device includes a determination unit that dynamically determines the threshold value according to a processing load state other than communication in the network terminal device, and the determination unit determines the threshold value.
- a configuration may be adopted in which whether or not an overload state is determined based on a threshold value.
- the threshold value is dynamically determined, it is possible to dynamically change the communication overload state when the load of processing other than communication processing in the network terminal device is large and small. Can be. As a result, the effects on processing requiring real-time properties other than communication processing in the network terminal device are eliminated, and the processing capability of the entire network terminal device is reduced to the maximum. Can be done.
- the determining means may determine the threshold value according to the number of application programs being executed by the network terminal device.
- the determining means may be configured to determine the threshold value according to the number of application programs being executed by the network terminal device and a weight determined for each application program.
- the threshold value can be appropriately set according to the processing load of the running application.
- the communication means includes: a first communication processing unit that performs communication processing corresponding to a physical layer and a data link layer; a reception buffer that temporarily holds data received from the first communication processing unit; And a second communication processing unit that performs communication processing corresponding to a layer above the network layer by taking out the received data that has been received, wherein the determination unit determines that the amount of received data held in the reception buffer is a threshold.
- a configuration may be adopted in which when it exceeds, it is determined that an overload state is present.
- an overload state is detected in a communication process (for example, an IP protocol process) in the second communication processing unit.
- the communication unit may perform a hierarchical communication process, and the invalidation unit may prohibit a logical connection between any layers.
- a load is not applied to a communication processing layer higher than a layer for which connection is prohibited, and a processing load is not applied to processing of the network terminal device other than the communication processing.
- a processing load is not applied to processing of the network terminal device other than the communication processing.
- the invalidation unit may be configured to prohibit notification of the received data from the first communication processing unit to the second communication processing unit.
- the invalidating unit only prohibits the notification of the received data, In a communication overload state, it is possible to remove the load of communication processing in layers above the network layer.
- the processing of the second communication processing unit is realized by the software and the CPU, the communication processing load on the CPU can be eliminated.
- the network terminal device of the present invention includes a communication unit that communicates via the network, a first detection unit that detects that the communication has become overloaded, and a detection unit that detects that the communication has become overloaded.
- Invalidation means for invalidating the data received by the communication means when the communication is performed, second detection means for detecting that the overload state has been eliminated, and detection of the fact that the overload state has been eliminated.
- a canceling means for canceling the invalidation by the invalidating means when performed.
- the communication overload state avoiding method and the program thereof according to the present invention have the same means as the above-described network terminal device, and have the same operations and effects as described above.
- FIG. 1 is a diagram showing a main hardware configuration of a network terminal device (communication overload state avoiding device) according to an embodiment of the present invention.
- Figure 2 is a block diagram showing the main configuration of the communication overload state avoidance device by function.
- FIG. 3 is a flowchart showing a detailed example of a communication overload state detection process in the overload state detection unit.
- FIG. 4 is a flowchart illustrating a detailed example of a process of detecting the end of the overload state in the overload state end detection unit.
- FIG. 5 is a diagram showing the correspondence between the number of running applications and the threshold value.
- Figure 6A shows the relationship between the application and the weighted conversion value. It is.
- FIG. 6B is a diagram showing another correspondence between the application and the weighted conversion value.
- FIG. 7 is a diagram illustrating an example of a system including home electric appliances to which the communication overload state avoidance device is applied.
- FIG. 8 is a diagram showing a configuration of an unauthorized access protection system according to the related art.
- FIG. 1 is a main view of a network terminal device according to an embodiment of the present invention.
- This network terminal device is called a communication overload state avoidance device 10 in the figure, and has a CPU (Central Processing Unit) 11, a memory 12, an interrupt controller 13, a LAN chip 14, a LANI / F ( interface) 15 and communicate with a communication host 16 via an IP (Internet Protocol) network 17.
- CPU Central Processing Unit
- memory 12 a memory 12
- interrupt controller 13 a LAN chip 14
- LANI / F interface 15
- IP Internet Protocol
- the memory 12 has an area for temporarily storing received data as a reception buffer, and a program describing the communication overload state avoiding method of the present invention is provided. Is stored. By executing this program by the CPU 11, the communication overload state avoiding device 10 determines whether or not the communication is overloaded, and when it is determined that the communication is overloaded, receives the received data. It is configured to be disabled.
- the communication overload state refers to a state in which processing other than communication (for example, processing of video data requiring real-time processing) in the communication overload state avoidance device 10 cannot be normally executed.
- the LAN chip 14 performs communication processing of a part of a physical layer and a data link layer conforming to, for example, the IEEE (Institute of Electrical and Electronic Engineers) 802.3 standard (called Ethernet (R)).
- Ethernet (R) IEEE (Institute of Electrical and Electronic Engineers) 802.3 standard
- the interrupt controller 13 When the controller receives a frame (called an Ethernet (R) frame) addressed to its own address via the LANI / F 15, the interrupt controller 13 notifies the controller 13 of the fact. Notice. Upon receiving this notification, the interrupt controller 13 further generates a reception interrupt in the CPU 11. This reception interrupt is an interrupt for notifying that the reception data has arrived.
- the CPU 11 Upon receiving the reception interrupt, the CPU 11 reads the data received by the LAN chip 14 from the buffer in the LAN chip 14 and transfers the data to the memory 12 to perform the IP protocol processing. At that time, in a steady state, the CPU 11 executes a program in the memory 12 to perform a process of detecting a communication overload state by checking a data reception amount per unit time. Puru.
- the communication host 16 has started a large amount of communication with the network terminal device 10.
- the CPU 11 masks the interrupt signal from the LAN chip 14 to the interrupt controller 13.
- the reception interrupt of Ethenet (R) does not occur, and the communication overload state is avoided.
- the CPU 11 executes the program in the memory 12 to perform processing for detecting the end of the overload state, and when the end of the overload state is detected, the CPU 11 sends the processing to the interrupt controller 13. Release the above interrupt mask. As a result, the normal state is restored from the abnormal state.
- FIG. 2 is a block diagram showing the main configuration of the communication overload state avoiding device 10 shown in FIG. 1 according to function.
- the communication overload state avoidance device 10 in the figure is composed of a LAN chip 14, LANIF 15, network driver 23, IP protocol processor 24, overload state detector 25, and overload state end detection. Part 26 is provided.
- the same components as those in FIG. 1 are given the same numbers.
- the LAN chip 14 performs communication processing in the PHY layer 21 corresponding to a part of the physical layer in the OSI (Open System Interconnection) reference model and the MAC layer 22 corresponding to a part of the data link layer. Perform communication processing.
- OSI Open System Interconnection
- LAN ⁇ / ⁇ 5 is a process corresponding to a part of the physical layer, and adapts frames to be transmitted and received between the LAN chip 14 and the IP network to the electrical specifications of the LAN chip 14 .
- the network driver 23 performs a communication process corresponding to a part of the data link layer in a steady state.
- This communication processing is processing as a normal so-called device driver, and includes data transfer from the LAN chip 14 to the memory 12 performed in response to the reception interrupt already described in FIG. Since the interrupt signal is masked in the abnormal state, the processing of the network driver 23 is substantially prohibited.
- the IP protocol processing unit 24 performs IP protocol processing on data transmitted and received from the network driver 23 in a steady state.
- the overload state detector 25 determines that the communication is overloaded, and the interrupt controller 13 Mask the interrupt signal to CPU11.
- the overload state end detection unit 26 checks whether or not there is a received frame in a buffer in the LAN chip 14 in an abnormal state. After performing the processing and determining that the received frame does not exist for a certain period of time, it is determined that the overload state has ended, and the interrupt mask for the interrupt controller 13 is released.
- the overload state detection unit 25 described above uses a specific time (for example, 10 ms) as a specific method of determining whether the amount of received data per unit time has exceeded a threshold value.
- the amount of received data (for example, the amount represented by the number of bits, bytes, frames, IP packets, etc.) may be measured, and a threshold judgment may be performed on the measurement result. It measures the time when a certain amount of data (for example, the number of bits, bytes, frames, or IP packets) arrives and measures the amount of time it takes. Threshold determination may be performed.
- the overload state detection unit 25 determines whether the amount of received data per unit time has exceeded a threshold, a certain amount (W number of frames) of received data has arrived.
- a threshold An example will be described in which the measured time is measured and a threshold judgment is performed on the measurement result.
- FIG. 3 is a flowchart showing a detailed example of the communication overload state detection process in the overload state detection unit 25.
- S300 to S302 and S309 in the figure are not part of the communication overload state detection process performed by the overload state detection unit 25.
- S300 to S302 show processing until the communication overload state detection processing is started by the reception interrupt in FIG. 1, and S309 shows the communication processing of the network driver 23.
- the frame counter in the figure is a counter for counting W frames, and counts down from W to 0.
- the time stamp Tn is a register for holding the time obtained from the real-time clock in the communication overload state avoidance device 10, and indicates the time at which the current frame was received.
- the time stamp T n-1 is the frame received W frames before the current frame. This is a register for holding the time at which the program was received.
- T n — ⁇ -1 means the time interval between the reception of W frames.
- the threshold ⁇ is a threshold for determining whether the time interval (T n- ⁇ ⁇ -1) is too short (overload condition).
- the threshold value A is set so that the communication process does not adversely affect other processes of the communication overload state avoidance device 10.
- the initial values of the frame counter, time stamp T n, and ⁇ -1 are all set to 0.
- the LAN chip 14 In the steady state, when the LAN chip 14 receives a frame via the LAN I / F 15 (S300), it generates a reception interrupt through the interrupt controller 13 (S301). Upon receiving this, the CPU 11 activates the re-overload state detecting section 25 by calling a program corresponding to the overload state detecting section 25 (S302).
- the overload state detection unit 25 substitutes the value of the time stamp Tn into ⁇ ⁇ -1 because the frame counter is 0 (S306), and (S305)
- the current time is acquired from the real-time clock as the value of the time stamp Tn (S306), and the start value W is set in the frame counter (S307).
- the time stamp T n is updated to the current frame reception time, and the value of the frame counter is updated to W.
- the overload state detector 25 determines that the frame power counter is not 0, that is, if no W frames have been received (S303: false).
- the frame count is decremented (S304), and the network driver 23 is started to perform reception processing (S309). If the frame counter is 0, that is, if W frames have been received (S303: true), the value of the time stamp Tn is substituted into Tn-1 (S30) Five ). Thus, the time stamp ⁇ -1 indicates the reception time of the W-th previous frame.
- the overload state detection unit 25 acquires the current time from the real-time clock, sets the current frame reception time to the value of the time stamp ⁇ (S306), and If the time interval ( ⁇ ⁇ — ⁇ ⁇ -1) is smaller than the threshold value ⁇ (S307: true), the interrupt signal of the interrupt controller 13 is masked (S310), A notification indicating that the communication overload condition has been detected is issued to 11 (S311), and the overload condition end detection unit 26 is activated (S312) 0
- time interval (Tn_Tn-1) is smaller than the threshold value A (S307: False), it is not overloaded, so start the network driver 23.
- a receiving process is performed (S309).
- the above threshold value A also depends on the processing capacity of the CPU 11. For example, if the transmission speed of AN is 1 OOM bps, (start value W of the frame counter, threshold value A) is changed to ( 85, 10 mS) or (170, 20 mS). In the case of 1OMbps, (8, 1Oms) or (17, 20ms) may be used. Threshold A should be much longer than the maximum burst time that normally occurs.
- the value of the threshold A is determined by the communication It can be dynamically determined according to the state of the processing load other than communication.
- a step of determining a threshold value may be provided between S307 and S308 shown in FIG.
- the communication overload of the CPU 11 in the processing capacity other than the communication processing in the communication overload state avoidance device 10 is large and small.
- the part that the process may occupy can be changed dynamically, and the communication overload state can be defined dynamically.
- the threshold value is determined according to the number of running applications, but the applications may be weighted. That is, the overload state detection unit 25 converts the number of applications into a weighted number such as 2, 3 instead of 1 for an application with a large processing amount or an application that requires real-time processing. Determine the total number of applications and determine the corresponding threshold.
- Figure 6A shows the weighted conversion values for each application. In this figure, application A pp 1, 4, 5, etc. remain 1, but A pp 2 converts the number of applications to 2, and similarly application A pp 3 converts to 3. It indicates that This makes it possible to absorb the difference in the processing amount that differs for each reapplication, and to dynamically determine a more appropriate threshold value.
- Fig. 6B shows examples of other conversion values. In this example, the application The number of applications for Yon 1 is converted to 5. For example, during the execution of the application 1, the threshold value becomes small, and the processing of the application 1 is protected without delay due to the data reception processing.
- the overload state end detection section 26 is activated to perform processing for detecting the end of the overload state.
- FIG. 4 is a flowchart showing a detailed example of a process of detecting the end of the overload state in the overload state end detection unit 26.
- loop 1 is a loop process that is repeatedly executed continuously for a fixed time (for example, 1 O m S)
- loop 2 is a loop process that is executed once every fixed period (for example, 5 seconds).
- Reason That is, the overload state end detection unit 26 performs the processing of the loop 1 of 1 Oms every 5 seconds as the polling processing.
- N is the number of times that it is determined that there is a high possibility that the communication overload state has been resolved, and is a value of an up counter that counts from 0 to 5.
- the threshold value B may be, for example, 85 when the transmission rate is 1 OOM bps and 8 when the transmission rate is 1 Obps, and may be the same value as the threshold value A. As shown, the threshold value may be dynamically determined similarly to the threshold value A.
- the overload state end detection unit 26 determines whether N is 5 or more (S410). In this determination, when the result of loop 1 that the overload state is highly likely to be resolved is high five times in a row, it is determined that the communication overload state has ended.
- the overload state detection unit 25 executes the processing of one loop 2 again after 5 seconds. If it is determined that N is 5 or more, the interrupt mask is released to the interrupt controller 13 (S412), and the CPU 11 is notified that the overload state has ended (S41). 4 1 3), finish this process.
- FIG. 7 is a diagram illustrating an example of a system including home electric appliances to which the communication overload state avoidance device 10 is applied.
- STB Set Top Box
- DVD recorder 1Ob DVD recorder 1Ob
- home server 1Oc personal computer 103
- network IF 104 network IF 104
- the STB 10a, the DVD recorder 10b, and the home server 10c have the configuration of the communication overload state avoiding device 10 shown in FIGS. 1 and 2, respectively.
- STB 10a receives (1) stream data from digital broadcasting Processing, (2) processing to receive stream data from the home server 10c or the distribution server 105, etc. via N, (3) reproduction of stream data and output processing to the TV 102, (4) Perform processing such as transmitting stream data to the LAN.
- (1) to (4) are all processes that require real-time processing. Of these, (2) and (4) may be possible by retransmission / reception, so (1) and (3) Is required to be more strictly real-time.
- the reception data amount in (2) becomes larger than usual for some reason, or that a frame addressed to the STB 10a is erroneously transmitted, resulting in a communication overload state.
- the STBIOa detects an overload condition, it stops the reception process of (2) by an interrupt mask to avoid the overload condition.
- the processing of (1) and (3) can be smoothly performed without being affected by the delay or dropout of the reproduction processing due to the overload condition.
- STBIOa detects the end of the overload state, so that when the overload state is resolved, the state is restored to the original state.
- the DVD recorder 10b is composed of (a) a process for receiving TV broadcasting, (b) a process for receiving stream data from the home server 10 Oc or the distribution server 105 via the LAN, and (c) a process for receiving stream data. It mainly performs the reproduction of stream data and output to the TV 102, (d) the process of transmitting stream data to the LAN, and (e) the process of recording to DVD. Of these, (a) to (d) are almost the same as (1) to (4) above, but the DVD recorder 10b is complicated and processing in that it also performs the recording processing of (e). Large amount.
- the home server 1 Oc records a stream data file or the like on a built-in hard disk and transmits / receives stream data or files to / from another device via the LAN. Detection, avoidance, and recovery of overload condition are the same as for STB 10a and DVD recorder 10b.
- the STB 10a, DVD recorder 10b, and home server 10c each have the communication overload state avoidance device 10 to detect, avoid, and recover from the communication overload state. It can be performed by itself, without the need for external additional devices and without user judgment.
- the received data is invalidated in the overloaded state, so that no judgment by the user and no additional device is required, and even if the communication is overloaded,
- the effects on communication processing and other processing can be eliminated. That is, since the receiving process does not occupy the processing capability of the CPU, it is possible to continue without deteriorating the quality of other processes. Therefore, it can be easily applied to a network terminal device used in a general home, and other processing can be smoothly performed. For example, as a process other than the communication process, even a network terminal device that performs processing of video data that requires real-time processing can eliminate the influence due to the communication overload state.
- the router used as the network IZF 104 is usually It may have a filter function to cut off any source address or protocol set by the user or to limit the flow rate.
- this user setting requires cumbersome operation and specialized knowledge. With the configuration in FIG. 7, it is possible to detect, avoid, and recover from an overload state corresponding to the flow rate restriction without requiring a troublesome user operation.
- the filter function by the network IF 104, the STB 10a, the DVD recorder 1Ob, and the home server 1Oc are individually set.
- the functions can be shared and complemented by combining the overload status detection, avoidance, and recovery functions.
- the configuration may be such that the overload state detection, avoidance, and recovery functions are individually turned on / off for the STB 1Oa, the DVD recorder 1Ob, and the home server 10c.
- any two of STB 10a, DVD recorder 10b, and home server 10c in Fig. 7 are combined to form one device, or three are combined to form one device. Even in such a case, the same effect can be obtained by providing the configuration of the communication overload state avoiding device 10.
- the personal computer 103 may be provided with the communication overload state avoiding device 10.
- the overload state detector 25 measures the amount of data received per unit time that reaches the data link layer (LAN chip 14), but the network layer (IP protocol processor)
- the configuration may be such that the amount of received data per unit time that arrives at 24) is measured and the measurement result is judged as a threshold.
- the overload state detection unit 25 instead of measuring the amount of received data per unit time reaching the network layer (IP protocol processing unit 24) and determining the threshold value, the overload state detection unit 25 uses a network. It may be determined whether or not the receiving process in the layer (IP protocol processing unit 24) has overflowed.
- the overload state detector 25 measures the amount of received data per unit time when the data reaches the data link layer (LAN chip 14).
- a configuration may be adopted in which the amount of received data in the reception buffer (the area in the memory 12) that temporarily holds the transferred received data is measured, and the measurement result is determined as a threshold value.
- the overload state detection unit 25 is connected to the network layer (the IP protocol processing unit 2) from the data link layer (the LAN chip 14) by masking the interrupt signal.
- the notification of the received data to 4 is prohibited, the notification of the received data or the transmission of the received data between other communication layers may be prohibited.
- (A) transmission of received data from the physical layer (LANI / F15) to the data link layer may be prohibited, or (B) any of the physical layer, data link layer, and network layer.
- the configuration may be such that the operation of this is disabled.
- the network IZF 104 instead of masking the interrupt signal by the overload state detection unit 25, the network IZF 104 detects that the overload state detection unit 25 has become overloaded. May be configured to discard the packet addressed to the communication overload avoidance device 10 in the network I / F 104 (filtering). In this case, the network I / F 104 may be configured to discard the bucket addressed to the communication overload state avoidance device 10 when notified of the overload state. At that time, the network IZF 104 may determine whether or not the packet is addressed to the communication overload avoidance device 10 based on, for example, the IP address or port number of the destination. In this case, the network IZF 104 further includes an overload state end detection unit 26, and filters the bucket when the overload state end detection unit 26 detects the end of the overload state. May be stopped.
- the communication overload state avoiding device 10 becomes in the communication overload state. Since the packet destined for the communication overload state avoidance device 10 is discarded by the network IF 104 until the state is cleared until the condition is resolved, the device equipped with the communication overload state avoidance device 10 (STB 1 Oa, DVD recorder 1 Ob, etc.) can execute the original processing other than communication smoothly without any adverse effects such as processing delay.
- the communication overload state avoiding device 10 includes a notifying unit that notifies a user that the communication is overloaded by sound, light, display, or the like in the communication overloaded state. May be provided.
- the notification unit described above converts the video signal to the TV 102 in accordance with the timing of detection, avoidance, and recovery of a communication overload state. Notifications such as ⁇ Reception is restricted for a while because communication has become overloaded, '' ⁇ Reception is being restricted due to communication overload, '' ⁇ Communication overload has been resolved, '' etc.
- a configuration in which the information is superimposed and displayed on the television 102 may be adopted.
- the communication processing of the data link layer is realized by the network driver 23 and the CPU 11, but is configured as a dedicated LSI chip irrespective of the CPU 11. May be.
- the communication processing of the network layer IP protocol processing section 24
- IP protocol processing section 24 is implemented in a software manner by the CPU 11, but is configured as a dedicated LSI chip regardless of the CPU 11. Is also good.
- the relationship between the number of running applications and the threshold value shown in FIG. 5 may be configured to be changeable from an external device by remote maintenance, or may be changed by a user setting.
- the configuration may be changeable.
- a plurality of corresponding tables may be stored in the network terminal device in advance, and the user may select the table.
- Industrial applicability It is suitable for a network terminal device connected to a network to transmit and receive data.
- a network terminal device connected to a home LAN for example, an STB (Set Top Box) for receiving digital broadcasts ), Digital TV, DVD (Digital Versatile Disc) recorder, HDD (Hard Disk Drive) recorder, etc., and suitable for content recording / reproducing devices, etc., or these composite devices.
- STB Set Top Box
- Digital TV Digital TV
- DVD Digital Versatile Disc
- HDD Hard Disk Drive
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US10/527,024 US20060187821A1 (en) | 2002-12-26 | 2003-12-22 | Network terminal apparatus, communication overload avoiding method and program |
JP2004562887A JPWO2004059914A1 (ja) | 2002-12-26 | 2003-12-22 | ネットワーク端末装置、通信過負荷回避方法およびプログラム |
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JP2008199138A (ja) * | 2007-02-09 | 2008-08-28 | Hitachi Industrial Equipment Systems Co Ltd | 情報処理装置及び情報処理システム |
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JPWO2009139170A1 (ja) * | 2008-05-16 | 2011-09-15 | パナソニック株式会社 | 攻撃パケット検知装置、攻撃パケット検知方法、映像受信装置、コンテンツ記録装置、およびip通信装置 |
JP2011199636A (ja) * | 2010-03-19 | 2011-10-06 | Fuji Xerox Co Ltd | 通信制御装置、画像形成装置、及びプログラム |
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Also Published As
Publication number | Publication date |
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CN1732650A (zh) | 2006-02-08 |
JPWO2004059914A1 (ja) | 2006-05-11 |
US20060187821A1 (en) | 2006-08-24 |
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