WO2011083966A2

WO2011083966A2 - Abnormal access blocking system using super-grids

Info

Publication number: WO2011083966A2
Application number: PCT/KR2011/000054
Authority: WO
Inventors: 권오헌; 김항진
Original assignee: 주식회사 유섹
Priority date: 2010-01-05
Filing date: 2011-01-05
Publication date: 2011-07-14
Also published as: KR101072982B1; KR101072983B1; WO2011083965A3; WO2011083965A2; KR20110081076A; KR20110081077A; WO2011083966A3

Abstract

The invention relates to an abnormal access blocking system, comprising: a global load balancing (GLB) domain name system (DNS) server which guides access to a destination that satisfies predetermined criteria; a plurality of grids divided into general grids and super-grids; and a control server which monitors the general grids, and replaces the general grids with the super-grids when the traffic for the general grids momentarily increases.

Description

Abnormal connection blocking system using super grid

The disclosed technology relates to an abnormal access blocking system and to an abnormal access blocking system capable of dynamically utilizing a super grid.

Distribute Denial of Service (DDoS) attacks generate huge amounts of traffic that cannot be handled by a computer system, overloading the computer system. In particular, distributed denial-of-service attacks target major government agencies, portal servers, bank servers, etc. and make normal users impossible to access.

Among the embodiments, the abnormal access blocking system may include a Global Load Balancing (GLB) Domain Name System (DNS) server, a plurality of grids divided into a general grid and a super grid, to guide a destination satisfying a predetermined criterion; And a control server that monitors the generic grid and dynamically replaces the generic grid with the super grid when traffic to the generic grid is momentarily increased.

In one or more embodiments, the abnormal access blocking method may further include: monitoring a plurality of grids each including at least one computing element in a specific zone, and when the traffic to the general grid is momentarily increased, Dynamically replacing with the super grid and updating a Global Load Balancing (GLB) Domain Name System (DNS) server.

1 is a diagram illustrating an abnormal access blocking system according to an embodiment of the disclosed technology.

FIG. 2 is a flowchart illustrating an abnormal access blocking method performed by the abnormal access blocking system of FIG. 1.

3 is a flowchart illustrating a specific example of FIG. 2.

4 is a diagram illustrating an abnormal access blocking method according to another embodiment of the disclosed technology.

FIG. 5 is a flowchart illustrating an abnormal access blocking method performed by the abnormal access blocking system of FIG. 4.

6 is a flowchart for explaining a specific example of FIG. 5.

Description of the disclosed technology is only an embodiment for structural or functional description, the scope of the disclosed technology should not be construed as limited by the embodiments described in the text. That is, the embodiments may be variously modified and may have various forms, and thus the scope of the disclosed technology should be understood to include equivalents capable of realizing the technical idea.

On the other hand, the meaning of the terms described in the present application should be understood as follows.

Terms such as “first” and “second” are intended to distinguish one component from another, and the scope of rights should not be limited by these terms. For example, the first component may be named a second component, and similarly, the second component may also be named a first component.

The term “and / or” should be understood to include all combinations that can be suggested from one or more related items. For example, the meaning of “first item, second item and / or third item” may be given from two or more of the first, second or third items as well as the first, second or third items. Any combination of the possible items.

When a component is referred to as being "connected" to another component, it should be understood that there may be other components in between, although it may be directly connected to the other component. On the other hand, when a component is said to be "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and terms such as "include" or "have" refer to features, numbers, steps, operations, components, parts, or parts thereof described. It is to be understood that the combination is intended to be present, but not to exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof.

For each step, the identifiers (e.g., a, b, c, ...) are used for convenience of description, and the identifiers do not describe the order of the steps, and each step is clearly contextual. Unless stated in a specific order, it may occur differently from the stated order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. The terms defined in the commonly used dictionary should be interpreted to coincide with the meanings in the context of the related art, and should not be interpreted as having ideal or excessively formal meanings unless clearly defined in the present application.

Referring to FIG. 1, the abnormal access blocking system 100 may include a user computer 110, a global load balancing (GLB) domain name system (DNS) server 120, a plurality of grids 130, and a control server. 140 and the origin server 150.

The user computer 110 executes an application to request a service provided by the origin server 150. In one embodiment, user computer 110 may be implemented as a desktop, laptop, or smartphone. In one embodiment, the rating of the user computer 110 may be classified by the GLB DNS server 120 and may be classified, for example, at risk or non-risk. For example, when classified as a risk group, the user computer 110 may not use a specific service. In another example, when classified as a non-risk group, a user's computer may use certain services.

GLB DNS server 120 provides a Global Server Load Balancing (GSLB) service that allows a plurality of servers to operate as one server through a smart name server. In one embodiment, the GLB DNS server 120 may determine the most optimal path for the situation by identifying the optimal path when there is a request for specific content. Herein, the specific content may be originally stored in the origin server 150 or may be cached in a cache server (not shown) in the grid 130. For example, the GLB DNS server 120 may direct access to the grid 130a closest to the user computer 110 if there is access from the user computer 110.

In one embodiment, the GLB DNS server 120 may preset an unavailable time zone for each of the plurality of grids 130. For example, when the traffic in the plurality of grids 130 is the most from 11 AM to 1 PM, the GLB DNS server 120 may set 11 AM to 1 PM as an unavailable time zone. In one embodiment, if there is access from the user computer 110, the GLB DNS server 120 may at least one of the plurality of available grids 130 based on information about the unavailable time zone of the plurality of grids 130. Grid 130a may be selected.

The plurality of grids 130 each include at least one computing element in a particular zone. Here, the computing element is a computing system constituting the grid 130a, and is not limited to a specific server. In one embodiment, the plurality of grids 130 may be classified into a regular grid and a super grid based on traffic thresholds. For example, a general grid may correspond to a server zone with less than 1 Gb of network, and a super grid may correspond to a server zone with more than 1 Gb of network.

In one embodiment, the plurality of grids 130 includes a respective security enhancement element, and when the traffic is momentarily increased, may enhance the security of the security enhancement element to block traffic. For example, security enhancements may include firewalls, intrusion detection systems (IDSs), and authentication.

The control server 140 monitors the plurality of grids 130. In one embodiment, the control server 140 may monitor traffic entering the plurality of grids 130. In another embodiment, the control server 140 may monitor for errors (eg, hardware failures) occurring in at least some of the plurality of grids 130.

The origin server 150 stores the original of the specific content requested by the user computer 110. Meanwhile, the specific content may be cached in a cache server (not shown) in the grid 130 in addition to the origin server 150. In one embodiment, if a particular content is not included in the cache server in the grid 130 guided by the GLB DNS server 120, the cache server (not shown) requests the origin server 150 to transmit the content. Can be.

In FIG. 2, the control server 140 may monitor the plurality of grids 130 (step S210). In one embodiment, the grid (eg, 130a) may send traffic to the control server 140 at certain times, and the control server 140 may monitor the traffic change of the grid 130a. For example, the control server 140 may determine that there is an abnormal connection (eg, DDoS attack traffic) when the traffic of the grid 130a is instantaneously increased compared to the usual traffic. As another example, the control server 140 may determine that there is an abnormal connection (eg, DDoS attack traffic, server load) when the traffic of the grid 130a exceeds a threshold.

When traffic to one of the plurality of grids 130 (hereinafter, the attacked grid) is momentarily increased, the at least one computing element belonging to the grid 130b of at least another part of the plurality of grids 130 is attacked. It can be dynamically allocated to the receiving grid 130a (step S220). For example, when a DDoS attack occurs in the grid 130a, the control server 140 may assign a computing element belonging to the grid 130b to the grid 130a and, if necessary, a computing element belonging to the grid 130c. May be further assigned to the grid 130a. The control server 140 may return the previously allocated computing element to the original state when the traffic of the attacked grid 130a decreases below the threshold. For example, when the DDoS attack is released to the grid 130a, the control server 140 may return the computing element belonging to the grid 130b, which has been added, back to the grid 130b.

The control server 140 may update the GLB DNS server 120 (step S230). In one embodiment, the GLB DNS server 120 may direct the connection to another grid 130b except for the attacked grid 130a if there is a new access. In one embodiment, the other grid 130b may correspond to a grid that is not set to an unavailable time zone. In another embodiment, the GLB DNS server 120, if there is a new approach, the grid 130b associated with the rating according to the rating of the user computer 110 of the plurality of grids 130 except the grid 130a being attacked. ) To guide the connection. For example, access by a user computer in a risk group may be directed to a grid with an enhanced security system. In another example, access by non-risk user computers may be directed to a grid with a common security system.

3 is a flowchart illustrating a specific example of FIG. 2.

Referring to FIG. 3, the control server 140 may monitor the plurality of grids 130 (step S301). In one embodiment, the grid 130a may transmit traffic to the control server 140 at predetermined times. In one embodiment, the control server 140 compares the average traffic of the grid 130a and the traffic transmitted from the grid 130a, and if an abnormality is greater than the threshold value, abnormal connection (eg, DDoS attack traffic) occurs. Can be determined. In another embodiment, the control server 140 may preset a threshold regarding the traffic of the grid 130a, and if the traffic received from the grid 130a exceeds the threshold, an abnormal connection (eg, a DDoS attack). Traffic, server load).

When an attack on one of the plurality of grids 130 is initiated (step S302), the grid 130a is attacked by at least one computing element belonging to the grid 130b of at least another part of the plurality of grids 130. Can be dynamically allocated (step S303). In one embodiment, the control server 140 may preferentially assign at least one computing element belonging to the plurality of available grids 130 based on the information about the unavailable time zone.

In one embodiment, the control server 140 may preferentially allocate computing elements belonging to the low-traffic grid 130b among the grids other than the attacked grid 130a. For example, assuming that traffic of any one grid 130a is 40, computing elements belonging to grid 130b having less than 40 traffic may be preferentially allocated. In another embodiment, the control server 140 may preferentially allocate a low-traffic computing element among the computing elements other than those belonging to the attacked grid 130a.

In one embodiment, the control server 140 may preferentially assign computing elements belonging to the grid 130b closest to the attacked grid 130a. In another embodiment, the control server 140 may preferentially assign the computing element nearest to the attacked grid 130a among the computing elements except for the computing elements belonging to the attacked grid 130a.

The control server 140 may update the GLB DNS server 120 (step S304). For example, if traffic is momentarily increased in the grid, the control server 140 may determine that an attack is to be initiated. For another example, if traffic on the grid exceeds a threshold, the control server 140 may determine that an attack is initiated. In one embodiment, the control server 140 may change the information for the plurality of grids 130 in the GLB DNS server 120. For example, at least one computing element in one grid 130a may be changed to a computing element in another grid 130b.

In one embodiment, if there is a new access, the control server 140 may direct the access to the grid 130b that is in the best path among the grids 130 except for the grid 130a where the traffic is momentarily increased. . In another embodiment, if there is a new access, the control server 140 directs the access to the grid 130b that is in the optimal path among the plurality of grids 130 except the grid 130a where traffic exceeds a threshold. can do.

When the attack on the attacked grid 130a is released (step S305), the control server 140 may return the assigned computing element to its original state (step S306). In one embodiment, the control server 140 may return the computing elements that were assigned when the traffic to the attacked grid 130a is below the threshold. In one embodiment, the control server 140 may return sequentially according to traffic without returning all at once. Here, the return criterion may preferentially return the computing element that is farthest from the attacked grid 130a or may preferentially return the computing element that belongs to the high-traffic grid 130b.

Steps S303 to S305 may be repeatedly performed until the attack on the attacked grid 130a is released.

4 is a diagram illustrating an abnormal access blocking system according to another embodiment of the disclosed technology.

Referring to FIG. 4, the abnormal access blocking system 400 includes a user computer 410, a global load balancing (GLB) domain name system (DNS) server 420, general grids 430, and super grids. (Grids) 440, a control server 450, and an origin server 460. 4 is substantially similar to at least a part of the configuration of FIG. 1, and thus description will be mainly given of differences. Even so, those skilled in the art can fully understand the embodiment without undue experimentation, and thus the scope of the right should not be construed as limiting.

It is classified into general grids 430 and super grids 440 according to the traffic threshold. For example, a general grid may correspond to a server zone with less than 1 Gb of network, and a super grid may correspond to a server zone with more than 1 Gb of network. In one embodiment, the super grids 440 may be classified according to the carrier. For example, all computing elements belonging to the super grid 440a may be connected to a communication network installed by the same carrier.

In one embodiment, the GLB DNS server 420 may preferentially direct access from the user computer 410 to the closest general grid 430a from the user computer 410. For example, the GLB DNS server 420 may direct access to the general grid 430a even if there is a super grid 440a closest to the user computer 410. For example, the GLB DNS server 420 may guide access to a communication network installed by a communication company used by the user computer 410 in the general grid 430a.

In one embodiment, the rating of the user computer 410 may be classified by the GLB DNS server 420, and may be classified into, for example, individuals, major government agencies, businesses. For example, if classified as an individual, the GLB DNS server 420 may direct the access to the general grid 430a. In another example, if classified as a major government agency or enterprise, GLB DNS server 420 may direct the access to super grid 440a.

In one embodiment, the GLB DNS server 420 may preset an unavailable time zone for each of the generic grids 430. In another embodiment, GLB DNS server 420 may not pre-set an unavailable time zone for super grids 440.

In FIG. 5, the control server 450 may monitor the general grids 430 and the super grids 440 (step S510). In one embodiment, the general grid 430a and the super grid 440a may transmit traffic to the control server 450 at a predetermined time, and the control server 450 may control the general grid 430a and the super grid 440a. You can monitor traffic changes. For example, the control server 450 may determine that there is an abnormal connection (eg, DDoS attack traffic) when the traffic of the general grid 430a is instantaneously increased compared to the normal traffic. As another example, the control server 450 may determine that there is an abnormal connection (eg, DDoS attack traffic, server load) when the traffic of the general grid 430a exceeds a threshold.

If the traffic to the general grid 430a is instantaneously increased, the control server 450 may dynamically replace the general grid 430a with the super grid 440a (step S520). In one embodiment, the control server 450 may dynamically replace with a super grid 440a of the same carrier as the user computer 410. In one embodiment, the super grid 440a may transmit the analyzed data to the control server 450. The control server 450 may analyze the data to classify abnormal connections (eg, DDoS attack traffic) and normal connections. For example, when traffic flowing to a specific domain exceeds a threshold, it may be determined that there is an abnormal connection for the corresponding domain traffic. In one embodiment, the control server 450 may update the GLB DNS server 420 for traffic classified as abnormal connections. For example, the GLB DNS server 420 may direct traffic classified as an abnormal connection to a path with security enhancement. For example, security enhancements may include firewalls, intrusion detection systems (IDSs), and authentication.

The control server 450 may return the normal grid 430a to the original state when the traffic of the super grid 440a replaced is reduced below the threshold. For example, when the DDoS attack is released to the super grid 440a, the control server 450 may restore the general grid 130b.

The control server 450 may update the GLB DNS server 420 (step S530). In one embodiment, when traffic to the general grid 430a increases momentarily or exceeds a threshold of traffic, the GLB DNS server 420 may direct access to the super grid (430a) if there is a new access. 440a). For example, a new approach to the generic grid 430a may be directed to the super grid 440a. If there is no specific content requested by the user computer 410 in the cache server (not shown) in the super grid 440a, the cache server (not shown) may request the origin server 150 to transmit the content.

6 is a flowchart illustrating a specific example of FIG. 4.

6 is substantially similar to the process of FIG. 3, at least a part thereof, and thus the differences will be mainly described. Even so, those skilled in the art can fully understand the embodiment without undue experimentation, and thus the scope of the right should not be construed as limiting.

Referring to FIG. 6, the control server 450 may monitor the general grids 430 and the super grids 440 (step S601). In one embodiment, the general grid 430a and the super grid 440a may transmit traffic to the control server 450 at a predetermined time. In one embodiment, the super grid 440a may transmit traffic analysis data to the control server 450. For example, the control server 410 may analyze the received data to classify abnormal connections (eg, DDoS attack traffic) and normal connections.

If an attack on one of the plurality of general grids 430 is initiated (step S602), the control server 450 may dynamically replace the attacked general grid 430a with a super grid (step S603). In one embodiment, the control server 140 may allow the generic grid 430a to move its traffic to the super grid 440a. For example, the control server 450 may move the DDoS attack traffic to the super grid 440a when a DDoS attack occurs on the general grid 430a. For another example, the control server 450 may change the traffic excluding the DDoS attack traffic to the super grid 440a. In one embodiment, the super grid 440a may transmit traffic analysis data to the control server 450. The control server 450 may analyze the received data and classify the traffic of the super grid 440a into an abnormal connection (eg, DDoS attack traffic) and a normal connection. In one embodiment, the control server 450 may move the abnormal connection to the path of the super grid 440a that includes the security enhancement element. Traffic that is classified as an abnormal connection while passing through the security hardening factor may be blocked by the security hardening factor. For example, security enhancements may include firewalls, intrusion detection systems (IDSs), and authentication.

The control server 450 may update the GLB DNS server 420 (step S604). In one embodiment, the GLB DNS server 420 may direct to the super grid 440a if there is a new approach.

The control server 450 may return the general grid 430a to its original state (step S606) when the attack on the super super grid 440a is released (step S605). In one embodiment, the control server 450 may return the generic grid 430a to normal once the traffic to the super grid 440a replaced is below the traffic threshold of the generic grid 430a.

Steps S603 to S605 may be repeatedly performed until the attack on the super grid 440a that has been replaced is released.

The disclosed technique can have the following effects. However, since a specific embodiment does not mean to include all of the following effects or only the following effects, it should not be understood that the scope of the disclosed technology is limited by this.

An abnormal access blocking system according to an embodiment can efficiently deal with abnormal access (eg, DDoS attack traffic, server load). For example, an abnormal access blocking system can allocate new computing elements or replace them with a super grid.

The abnormal access blocking system according to an embodiment may not affect the normal connection when an abnormal connection (eg, DDoS attack traffic, server load) occurs. When there is a new normal connection, the GLB DNS server may inform the optimal path among the plurality of grids 130 except the attacked grid 130a or dynamically allocate a super grid.

The abnormal access blocking system according to an embodiment may classify the grade of the user computer 410 by the GLB DNS server 420 to block abnormal access (eg, DDoS attack traffic) in advance. The user computer 410 may be classified into individuals, major government agencies, and corporations, and the GLB DNS server informs other routes of the individual and the corporate access so that the individual may not know the corporate route.

Although described above with reference to a preferred embodiment of the present application, those skilled in the art various modifications and changes to the present application without departing from the spirit and scope of the present application described in the claims below I can understand that you can.

Claims

A Global Load Balancing (GLB) Domain Name System (DNS) server for guiding destinations that meet predetermined criteria;

A plurality of grids divided into a regular grid and a super grid;

And a monitoring server that monitors the general grid and dynamically replaces the general grid with the super grid when traffic to the general grid is momentarily increased.
The method of claim 1, wherein the control server

And the normal grid directs its traffic to the super grid.
The method of claim 1, wherein the control server

And updating the GLB DNS server so that the GLB DNS server directs to the super grid when there is a new access.
The method of claim 1, wherein the GLB DNS server

Abnormal access blocking system, characterized in that it comprises information about the time zone unavailable to the general grid.
The method of claim 1, wherein the control server

Abnormal traffic blocking system, wherein when the traffic to the super grid is reduced, the GLB DNS is updated and a new access is guided to the general grid.
The method of claim 1, wherein the GLB DNS server

Abnormal access blocking system characterized by differentiating the access route to the destination according to a predefined level of the user computer.
(a) monitoring a plurality of grids each including at least one computing element in a particular zone;

(b) dynamically replacing the generic grid with the super grid if traffic to the generic grid is momentarily increased; And

and (c) updating the Global Load Balancing (GLB) Domain Name System (DNS) server.