ddos techniques

DDoS is a distributed Dos attack (distributed denial of service attack). Through multiple hosts to a single server attack, that is, multiple hosts constantly to the server to initiate service requests, so that the server consumes a lot of CPU, memory, network bandwidth and other resources overwhelmed, can not provide normal service or even paralysis.DDoS protection is mainly from two aspects, that is, host settings and network settings.Host settings:1

Use the hash conflict vulnerability in PHP to launch DDoS attacks. File dos. what is the php target address? $ host127.0.0.1test. php; $ data; $ sizepow (2, 15); for ($ key0, $ max ($ size-1) * $ s file dos. php // Target address // What does the target address do if it exists? $ Host = 'http: // 127.0.0.1/test. php '; $ Data = ''; $ Size = pow (2, 15 ); For ($ key = 0, $ max = ($ size-1) * $ size; $ key { $ Data. = ' array ['. $ key. '] = 0 '; }

How to configure Windows server to cope with high concurrency and DDOS attacksWindows systems have many mechanisms to improve performance and security, many of which can be used to cope with high-concurrency requests and DDOS attacks. The following configuration can be used to improve the performance of windows Servers: 1. Handle High-concurrency requests: 1. TCP connection delay wait time TcpTimedWaitDelay

Author: the load capacity of Ayounginx is super powerful. Generally, small ddos attacks cannot kill an nginx proxy. Therefore, it is no problem to use nginx to filter out some small ddos attacks. In the morning, my colleague was responsible for a server and crashed after the server was restarted. After checking, he found that there was a high access volume of a link. I checked it out, because this project i

VM service providers may be attacked by hackers during operation. Common attacks include SYN and DDoS attacks. By changing the IP address, it is possible to find the attacked site to avoid the attack, but the service interruption takes a long time. Relatively thorough Solution You can add a hardware firewall. However, hardware firewalls are expensive. You can consider using Linux Virtual Host Server Firewall provided by itself Function To defend a

How to check whether a Linux server is under DDOS Attack Address: http://www.phpthinking.com/archives/427 Log on to your server and run the following command as the root user to check whether your server is under DDOS Attack:Netstat-anp | grep 'tcp \ | udp' | awk '{print $5}' | cut-d:-f1 | sort | uniq-c | sort-nThis command displays the list of the maximum number of IP addresses that have been logged on to

The game server configuration selects the undead anti-DDoS server.The game server configuration selects the undead anti-DDoS server.If you select a game server and want to use a domestic server, we recommend that you use a domestic telecom anti-DDoS server. If you configure the server, you generally use a dual-core to eight-core processor. The memory size above 8

Ten security policies to prevent DDoS attacks This article is provided by the famous German hacker Mixter (only 20 years old) who compiled Distributed Denial-of-Service attack tools TFN and TFN2k (these tools were used to attack large websites such as Yahoo.To put it simply, it is very complicated to master all the causes and security vulnerabilities that may cause intrusion and be used to launch DoS attacks. In detail, there is no simple or dedicate

原文地址：http://www.phpthinking.com/archives/427 Log on to your server and execute the following command with the root user , using it you can check whether your server is in DDoS attack or not: netstat-anp |grep ' tcp\|udp ' | awk ' {print $} ' | Cut-d:-f1 | Sort | uniq-c | Sort–n This command will show that the logged on is the maximum number of IPs connected to the server List. ddos become more comple

First, look at the iptable solution. To solve the SYN flood and DDoS and other recommended use iptable, lighter, is also iptable more good at.Looking up on the internet, Iptable's recent module can solve the problem,First look at the parameters of recent,--name #设定列表名称, default defaults.--rsource #源地址, this is the default.--rdest #目的地址--seconds #指定时间内--hitcount #命中次数--set #将地址添加进列表, and updates the information, including the timestamp of the added ad

This article introduces the PHP implementation of malicious DDoS attacks to avoid the bandwidth consumption problem method, this article is a simple method, the need for friends can refer to the DDoS attacks implemented using PHP code can cause bandwidth to be consumed and become card B. The approach is: modifying php.ini files 1) "Disable_functions" changed to Gzinflate, the default is to vent 2) "All

Recently a period of time php-ddos flooding, a period of time before the VPS was hackers hanging horse, a few months of traffic ran hundreds of G, a bit of doubt is being used to php-ddos, so today reinstall the VPS system and reconfigure the environment.Under the use of Iptables, from the root causes of the ban on Php-ddos external contract. disable sending UDP

suddenly rise, looked at the ranking, "Wu Move the Universe" This word incredibly to the Baidu home page, so in the article inserted links, many sites to collect, get a lot of outside the chain. By March, the site incredibly to the second home page Baidu, although only persisted for three days, immediately fell to the fifth, but those days every day has 100,000 IP, at that time cut a map (with the plug-in of shielding ads, so no promotional links). The website traffic is big, some peo

TCP connection: 1 Webuià high-grade equipment à group, set up a team "all" (can be customized title), including the entire network segment of all IP address (192.168.0.1--192.168.0.254). Attention: Here the user LAN segment is 192.168.0.0/24, the user should be based on the actual use of IP address segment for group IP address segment designation. 2) Webuià high-grade equipment à transaction for the strategic equipment, set up a strategic "pemit" (can be customized title), the "all working G

Some recommendations for preventing distributed denial of service (DDoS) attacks on Cisco routers 1, the use of IP verfy unicast reverse-path network interface command This feature examines each router's packet. In all routing items that the packet reaches the network interface of the router's CEF (Cisco Express forwarding) table, the router discards the packet if there is no route for the packet source IP address. For example, a router receives a p

restart The above rule means that only 192.168.0.2 this IP is allowed to access port 11211.Verify Memcache Port 11211 is turned onTake IP (1.2.3.4) as an example:Telnet 1.2.3.4 11211You can connect directly to port 11211 of the Memcache service without a user name password. Execute the following command to obtain the corresponding result: # Stats//view Memcache service status# Stats Items//View all items# stats Cachedump 32 0//Get cache key# get:state:264861539228401373:261588//Read the value

Comments: Distributed Denial of Service (DDoS) attacks are common and difficult to prevent by hackers. Distributed Denial of Service (DDoS) attacks are all called Distributed Denial of Service) it is an attack that hackers often use and cannot prevent. Its English name is Distributed Denial of Service ｡DDoS is a network attack that uses reasonable service request

Cisco switch security common traffic control and anti-DDoS problems. Recently, cisco switch security has been favored by many friends. Let's have a deep understanding of cisco switch security solutions today! Traffic control, anti-DDoS, virtual lan vlan, and access control list-based firewall functions. Traffic Control The cisco switch's secure traffic control technology limits abnormal traffic flowing thro

Because of the special nature of the admincp file. When a new connection is generated. It will occupy a lot of system resources. Therefore, when multiple IP addresses continuously access the admincp. php file, the server is vulnerable to DDOS attacks. Solution:In the beginning of the admincp. php file Exit ('Warning ---- your operation has been disabled. ');} Extension. Adding the same code to each file header in the same way can greatly improve the a

Reference for methods to prevent malicious ddos attacks in php This article introduces a simple method to prevent ddos attacks in php programming. For more information, see.We know that a denial-of-service attack means that a DDOS attack will cause the bandwidth to be occupied, so that normal users cannot access the website.Here is a simple reference