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Synchronize (SYN) message transmitting method and device and network equipment

A technology for synchronizing messages and sending devices, which is applied in the field of communication, and can solve the problems of MSS and VPN gateway discarding without saving the TCP header option of the SYN message

Active Publication Date: 2014-07-30
BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The existing SYNCOOKIE scheme does not save the MSS value of the TCP header option of the SYN message, which causes the length of the message sent by the server to the client to exceed the MTU allowed by the VPN channel and is discarded by the VPN gateway.

Method used

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  • Synchronize (SYN) message transmitting method and device and network equipment
  • Synchronize (SYN) message transmitting method and device and network equipment
  • Synchronize (SYN) message transmitting method and device and network equipment

Examples

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Embodiment Construction

[0034] figure 1 It is a flowchart of an embodiment of the synchronous message sending method of the present invention, such as figure 1 As shown, the synchronization message sending method may include:

[0035] Step 101, after receiving the first synchronization message sent by the client, the synchronization message sending device sends a synchronization confirmation message to the above-mentioned client, and the serial number of the synchronization confirmation message carries the MSS of the first synchronization message.

[0036] In step 102, the device for sending a synchronization message receives the first confirmation message sent by the client for the synchronization confirmation message.

[0037] Step 103, if it is determined that the above-mentioned first confirmation message is a legitimate message, then the synchronization message sending device generates a second synchronization message according to the above-mentioned first confirmation message, and sets the abo...

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Abstract

The present invention provides a synchronization message sending method, device and network equipment. The synchronization message sending method includes: after the synchronization message sending device receives the first synchronization message sent by the client, sending a synchronization confirmation message to the client ; Receive the first confirmation message sent by the client for the synchronization confirmation message; if it is determined that the first confirmation message is a legal message, then generate a second synchronization message according to the first confirmation message, and according to the first confirmation message Set the value of the MSS option of the second synchronization message; send the second synchronization message with the above value set to the server. Thereby, the server can set the MSS of the message sent by the server to the client to the value of the MSS option of the second synchronization message, thereby solving the problem that SYNCOOKIE cannot save the value of the MSS option of the SYN message, causing the server to send the value of the MSS option to the client. The problem that the length of the packet exceeds the MTU allowed by the VPN tunnel and is discarded by the VPN gateway.

Description

technical field [0001] The invention relates to firewall technology, in particular to a synchronous message sending method, device and network equipment, and belongs to the technical field of communication. Background technique [0002] Synchronize flood (Synchronize Flood; hereinafter referred to as: SYN Flood) attack is currently the most popular denial of service attack (Denial of Service; hereinafter referred to as: DoS) and distributed denial of service attack (Distributed Denial of Service; hereinafter referred to as: DDoS) One of them is an attack method that utilizes a transmission control protocol (Transmission Control Protocol; hereinafter referred to as: TCP) protocol defect to send a large number of forged TCP connection requests, thereby exhausting the resources of the attacked party. [0003] In the prior art, the process of establishing a TCP connection is specifically: [0004] In the first step, the requesting end (client) sends a TCP message containing a S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L12/741H04L7/00H04L12/46H04L45/74
Inventor 黄凯明
Owner BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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