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1. DDoS Attack Basics The main purpose of a Distributed Denial of Service (DDoS) attack is to make the specified target unable to provide normal services or even disappear from the Internet. It is one of the strongest and most difficult to defend attacks. According to the way initiated, DDoS can be simply divided into three categories. The first category to win, massive data packets flocked from all corners of the Internet, blocking IDC entrance, so that a variety of powerful hardware defenses ...

1. Defensive Foundation 1.1. Attack Traffic in the End How DDoS Talk about defense, the first is to know in the end suffered much attack. This question seems simple, in fact, there are many unknown details in it. Take SYN Flood as an example. To increase the sending efficiency, more SYN wait queues are generated on the server. When the attacker populates the header, the IP header and the TCP header are not filled with optional fields, so IP ...

TCP (Transmission Control Kyoto) Transmission Control Protocol three times handshake TCP is host to the host Layer Transmission Control Protocol, providing reliable connection services, using three handshake confirmation to establish a connection: bit code that TCP flag bit, there are 6 kinds of indicators: SYN ( Synchronous online) ACK (acknowledgement confirmation) PSH (push transfer) FIN (finish) RST (reset reset) ...

The router is an important bridge for the LAN to connect the external network, is an indispensable part in the network system, and also the Frontier Gateway of the network security. But the maintenance of the router is rarely appreciated. Just imagine, if the router even its own security is not guaranteed, the entire network there is no security to say. Therefore, in the network security management, the router must be properly planned and configured to take the necessary security measures to avoid the security problems of the router to the entire network system to bring loopholes and risks. We are here to introduce some of the router to enhance the security of the measures and methods, let me ...

Wen/gashero has experienced several DDoS attacks during his tenure in the Shell network. The despair of the mood, still vividly. The problem is not what you can do, but the computer room decides that you can't do anything. Attackers are controlling a large enough distributed cluster to launch an attack, and all kinds of assorted packages will be available. Don't care what service you open, nor the patience to analyze what service you have. For example, even if you do not open any UDP services, but he is a large pile of UDP packets, to fill your bandwidth. What else can we do? More than 10 years ago the OS couldn't handle a lot of ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall One, the event occurs after the Spring festival holiday just over, the web fails, 1 o'clock in the afternoon eat back, immediately the desktop unlocked and habitually checked the Web server. 　　The Web server performance monitoring software image shows a downward slide of the red curve to see the problem with the website. Based on the above questions, I immediately started checking the Web server log to see if I could detect when the problem started, or find some clues about the interruption. Proper inquiry process ...

Intermediary trading http://www.aliyun.com/zixun/aggregation/6858.html"> SEO Diagnostic Taobao Guest Hosting Technology Hall DDOS is the abbreviation of English Distributed Denial of Service, which means "Distributed Denial of Service", DDOS Chinese called Distributed Denial of Service attacks, commonly known as flood attacks. There are many ways to attack DoS, the most basic DoS ...

Translator: Alfredcheung on the topic of building high throughput Web applications, Nginx and Node.js are natural couples. They are all based on the event-driven model and are designed to easily break through the c10k bottlenecks of traditional Web servers such as Apache. Preset configurations can be highly concurrent, but there is still work to do if you want to do more than thousands of requests per second on inexpensive hardware. This article assumes that readers use Nginx's httpproxymodule for upstream node ....

Voice Transmission (VoIP) technology based on IP network has developed into a special voice communication technology, and its application is more and more wide. But the study found that, in addition to quality of service issues, security issues are the Chief Technology Officer (CIO) in making VoIP decisions to focus on the content. In reality, many customers say that the security situation does not meet the enterprise's application standards is the reason they do not want to deploy VoIP for the time being. Currently, VoIP faces 4 security issues: Denial of service (DoS) attacks, illegal access, charges fraud or eavesdropping threats. Market research ...

51CTO Recommendation: Website common attack and defense website How to protect network security, so here to you how to protect the network security problems and specific measures, then how to protect the network security? To start with the details, step by step, let's look at some details on how to secure the network. First, how to ensure the security of network security Hidden Trouble Analysis: 1, the server is used by the private operating system and database, the so-called private, not completely write their own, but said, are all privatized reformed, generally using open source operating system and database ...