The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2008
Filed:
Jul. 03, 2003
Yong Yang, Shenzhen, CN;
Xindong Teng, Shenzhen, CN;
Hongzhou Jiang, Shenzhen, CN;
Minglei LI, Shenzhen, CN;
Qiang Zhao, Shenzhen, CN;
Fei Zheng, Shenzhen, CN;
Jiansen Yang, Shenzhen, CN;
Jingze Guo, Shenzhen, CN;
Yan Qi, Shenzhen, CN;
Yong Yang, Shenzhen, CN;
Xindong Teng, Shenzhen, CN;
Hongzhou Jiang, Shenzhen, CN;
Minglei Li, Shenzhen, CN;
Qiang Zhao, Shenzhen, CN;
Fei Zheng, Shenzhen, CN;
Jiansen Yang, Shenzhen, CN;
Jingze Guo, Shenzhen, CN;
Yan Qi, Shenzhen, CN;
Abstract
The invention relates to a method for preventing TCP SYN package flood attack, and belongs to the computer network security field. First, the firewall receives a client a TCP SYN connection request package, and responses, as an agent of the server, an acknowledgement of the TCP SYN connection request package with zero window size to the client. Then, the firewall records information about the TCP SYN connection request package and checks whether the connection request is legal. When the firewall has received a TCP SYN response package from the server, it returns an acknowledgement of said TCP SYN response package. At the same time, the firewall, as an agent of the server, sends an acknowledgement packet with nonzero window size to the client for initiating data transmission from the client. After that, data packets are transferred between the client and the server forwarded by the firewall as an agent. With the invention method, it can guarantee that protected servers in a computer network will not be destroyed by TCP SYN package flood attack.