The server collects two types of script code for ddos attacks. One is the linux shell Command, and the other is the support for php code in any environment. I will post the source code below, for more information, see.
SHELL scripts for server defense against DDOS attacks
1. write scripts
Mkdir/root/bin
Vi/root/bin/dropip. sh
#! /Bin/bash
/Bin/netstat-na | grep ESTABLISHED | awk '{print $5}' | awk-F: '{prin
Therefore, the method of attacking the city is the last resort.
Know yourself, know yourself, do not know, do not fight
-- Sun Tzu's Art of War
We will implement a tool for DDoS attacks at the application layer. in comprehensive consideration, the CC attack method is the best choice. We will use the bash shell script to quickly implement and verify this tool. At the end, discusses how to defend against DDoS
discovery feature is prohibited. ICMP routing notification packets can be used to increase the routing table record and can cause attacks, so routing discovery is prohibited.
The code is as follows
Copy Code
"PerformRouterDiscovery" =dword:00000000
Of course, the best case is to use the Linux system, in addition to the system itself, because there are more options available
Common DDoS attacks and defenses
C
Tags: art link process off Compute connection State Java 3.1 waitJudging DDoS attacks from a TCP state machine first, the TCP protocol The TCP protocol is the core protocol of the Transport layer, providing a reliable connection-oriented protocol, divided into three handshake and four disconnects, in which TCP has a state machine that records the state of the different stages. second, TCP handshake and disconnection Here does not focus on the three-ti
1. Limit the number of IP connections to 80 ports to a maximum of 10, which can be customized.
The code is as follows
Copy Code
Iptables-i input-p TCP--dport 80-m connlimit--connlimit-above 10-j DROP
2. Use the recent module to limit the number of new requests in the same IP time, recent more features please refer to: Iptables Module recent application.
The code is as follows
Copy Code
Iptables-a input-p TCP--dpor
1, ensure the security of the server systemThe first step is to ensure that the server software does not have any vulnerabilities to prevent attackers from invading. Make sure the server is up to date with the latest system and security patches. Remove unused services on the server and close unused ports. For Web sites running on the server, make sure that they have the latest patches and no security holes.2. Hide the server real IPServer front-end plus CDN Transfer (free Baidu Cloud acceleratio
The main 2 basic practical applications, mainly related to the ban Ping (IPv4) and the prohibition of UDP, that is, the use of the server to prevent hackers to outsource DDoS attack content.
First, if there is no iptables prohibit ping
echo 1 >/proc/sys/net/ipv4/icmp_echo_igore_all #开启echo 0 >/proc/sys/net/ipv4/icmp_echo_igore_all #关闭Second, the use of iptables rules to ban ping
Iptables-a input-p ICMP--icmp-type 8-s 0/0-j DROP
Third, using the Ip
The Windows system itself has many mechanisms that can be used to improve performance and security, many of which can be used to cope with high concurrent requests and DDoS attacks.
Windows Server performance can be improved with the following configurations:
First, to respond to high concurrent requests:
1, TCP connection delay wait time TcpTimedWaitDelay:
This is the time that must elapse before TCP/IP can release a closed connection and reuse i
The penalty policy for this attack is,
Further violations would proceed with these following actions:
1st violation-warning and shutdown of server. We'll allow hours for your to rectify the problem. The first time is a warning + shutdown, give 24 hours to solve the problem
2nd violation-immediate reformat of server. The second time is to format the server immediately
3rd violation-cancellation with no refund. The third time is to cancel the service without giving a refund
To address this pr
DoS (Denial of service denial-of-service) and DDoS (distributed denial of service distributed Denial-of-service) attacks are one of the security threats to large Web sites and network servers. The attacks on Yahoo, Amazon and CNN in February 2000 were carved into the history of major security events. Because of its good attacking effect, SYN Flood has become the most popular DOS and DDoS attack method at pr
DoS (Denial of service denial-of-service) and DDoS (distributed denial of service distributed Denial-of-service) attacks are one of the security threats to large Web sites and network servers. The attacks on Yahoo, Amazon and CNN in February 2000 were carved into the history of major security events. Because of its good attacking effect, SYN Flood has become the most popular DOS and DDoS attack method at pr
Squid also uses the port ing function to convert port 80. In fact, common DDOS attacks can modify the parameters in/proc/sys/net/ipv4/tcp_max_syn_backlog, the default parameters are usually very small and set to more than 8000. Generally, DDOS attacks can be solved. If it reaches the timeout stage, set/proc/sys/net/ipv4/tcp_fin_timeout to a smaller value.
Everyone is discussing
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. A thorough solution is to add a hardware firewall. However, hardware firewalls are expensive. You can consider using the firewall function provided by the Linux virtual host server.
1. resist SYNSYN attacks
The test server was not expected to be attacked, and no preventive measures were taken. The csf firewall is installed to handle a small number of ddos and cc attacks, which is quite useful. We have also used the TDS before. For details, refer to the linux TDS firewall installation and configuration. The following is a record of how I discovered and solved the attack.
1. Adjusting apache connections will always be full and system resources will be gre
This article mainly introduces the principle and defense of DDoS attacks by using JavaScript, as well as the related man-in-the-middle attack principles. For more information, see distributed denial of service (DDoS) attacks) attacks are the oldest and most common attacks against websites. Nick Sullivan is a system engineer at CloudFlare, a website acceleration and security service provider. Recently, he wr
Brief Analysis of A DDoS Trojan
This article is a foreign researcher's analysis of a DDoS Trojan. the MD5 of the Trojan file is 67877403db7f8ce451b72924188443f8.
Install
There are two subprograms in the main function of the malware to check whether the malware has been installed on the system.
The trojan detects the registry and file paths such:
After careful observation, you will find that the instal
Brief description:
SMS ddos Attack Vulnerability in Shanda online
Detailed description:
Shanda online will send a verification code to the mobile phone when the password is forgotten. URL:
Http://pwd.sdo.com/ptinfo/safecenter/getpwd/ChgPwdStepOldPwd.aspx? Showbindmobile = 1
Mobile phone numbers can be controlled at will, and sms ddos attacks can be carried out without quantity control.
Proof of vulnerabilit
Strategy:1) Use the Ngx_http_limit_req_module module to limit the rate of requests and the number of request connectionsConfiguration reference: Http://nginx.org/en/docs/http/ngx_http_limit_req_module.html#limit_req_zone2) limit the number of concurrency using the Ngx_http_limit_conn_module moduleConfiguration reference: Http://nginx.org/en/docs/http/ngx_http_limit_conn_module.html#directivesThe configuration is given as follows:http{ limit_req_zone $binary _remote_addrzone=one:10mrate=1r/s; lim
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
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