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TCP (Transmission Control Protocol) connection elimination method

A connection table and data packet technology, applied in the field of network security, can solve the problems of non-arrival, elimination of TCP connections, etc., to achieve the effect of fewer visits and prevention of attacks

Active Publication Date: 2012-07-04
DAWNING INFORMATION IND BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The shortcoming of the existing technology is: use the method that has not been used for a long time to eliminate the TCP connection, and it is possible to eliminate the connection that is very active in the previous stage, but the data has not arrived after a period of time due to network reasons
At the same time, it is easy to eliminate valid TCP connections during a synflood attack

Method used

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  • TCP (Transmission Control Protocol) connection elimination method
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Experimental program
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Embodiment Construction

[0023] The detailed steps of the program of the present invention are as follows:

[0024] 1. Initialize the concurrent connection table;

[0025] 2. Receive syn , reset For data packets, look up the concurrent link table according to the quadruple, and go to step 5;

[0026] 3. Receive syn ack or ack packet, go to step 8

[0027] 4. Receive fin or fin ack packet, go to step 9;

[0028] 5. If the search is successful, it is the retransmitted syn packet and discarded; if the search fails, check whether the maximum number of concurrent connections is greater than the threshold, if it is less, go to step 6, otherwise go to step 7.

[0029] 6. Find the connection node with the least number of calls and the connection node that has not been visited for the longest time and eliminate it;

[0030] 7. Create a new concurrent connection item, set the number of calls to 1, move the node to the first node with a call number of 1, and go to step 10;

[0031] 8. If the search node is...

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Abstract

The invention provides a TCP (Transmission Control Protocol) connection elimination method, which is characterized in that: least recently used (LRU) TCP connection which has the smallest access frequency is eliminated all the time by using high-efficiency storage and retrieval of hash and an effective TCP connection elimination mechanism. Compared with the prior art, the TCP connection elimination method has the beneficial effects that: one TCP connection elimination strategy is realized; holding of an active node with more frequent access is guaranteed; and the node with low access frequency which is not accessed at the longest is eliminated. According to the method, the active connection is held, and synflood attack can be prevented to a certain extent.

Description

technical field [0001] The invention belongs to the field of network security. It specifically relates to a TCP connection elimination method. Background technique [0002] With the rapid development of the network, the network environment is becoming more and more complex, the more difficult it is to ensure the original order of the data transmitted in the network, in order to effectively analyze the upper layer application and ensure the speed of responding to the data flow on the backbone network, TCP offloading technology growing in popularity. Due to the limitation of system resources, such as: physical memory, etc. The number of concurrent TCP connections supported is also limited. In a high-speed network environment, there must be a large number of concurrent TCP connections, and there is also the problem of elimination of TCP connections. The elimination of the TCP connection mainly includes two steps, the elimination strategy and retrieval of the TCP connection. ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L29/06H04L12/743
Inventor 刘灿刘朝辉窦晓光李锋伟邵宗有
Owner DAWNING INFORMATION IND BEIJING