how to prevent ddos

This article provides a detailed analysis of solutions for PHP programs to prevent ddos, dns, and cluster server attacks. For more information, see This article provides a detailed analysis of solutions for PHP programs to prevent ddos, dns, and cluster server attacks. For more information, see Speaking of nonsens

AdjustTCP ParametersPrevent DDoS attacks 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 t

, portals, large e-commerce and securities companies, IRC servers, and news and magazines. If the website does not belong to this type of website, you do not have to worry too much about becoming a direct target for DoS attacks. 2. Ask for assistance and cooperation with ISP It is important to obtain assistance and cooperation from your major Internet Service Provider (ISP. Distributed Denial-of-Service (DDoS) attacks consume bandwidth, and you cannot

-refresh times$uri = $_server['Request_uri']; $checkip=MD5 ($IP); $checkuri=MD5 ($uri); $yesno=true; $ipdate=@file ($file);foreach($ipdate as$k =$v) {$iptem= substr ($v,0, +); $uritem= substr ($v, +, +); $timetem= substr ($v, -,Ten); $numtem= substr ($v, About); if($time-$timetem $allowTime) { if($iptem! = $checkip) $str. =$v; Else{$yesno=false; if($uritem! = $checkuri) $str. = $iptem. $checkuri. $time."1";ElseIf ($numtem 1) .""; Else { if(!file_exists ($fileforb

Php implementation code to prevent ddos, dns, and cluster attacks /** * Prevents ddos, dns, cluster, and other attacks * Edit bbs.it-home.org */ // Query the forbidden IP address $ Ip = $ _ SERVER ['remote _ ADDR ']; $ Fileht = ". htaccess2 "; If (! File_exists ($ fileht )) File_put_contents

This article introduces how Iptables limits the number of connections of the same IP address in linux to prevent CC/DDOS attacks. This is only the most basic method. If the attack is real, we still need hardware compaction to prevent it. 1. Set the maximum number of connections to port 80 to 10, which can be customized. The Code is as follows: Copy c

I:ComeDdosscript from http://www.inetbase.com/scripts. This script was originally developed to prevent DDoS attacks and runs periodically (for exampleEvery second), use the netstat command to record the current network connection status, filter the Client IP address from the recorded data, and count the number of connections of each client IP address, set the number of connectionsIf an IP address has too ma

Analysis of PHP programs to prevent ddos, dns, and cluster server attacks. To put it bluntly, copy the code as follows :? Php query prohibited IP $ ip $ _ SERVER [REMOTE_ADDR]; $ fileht. htaccess2; if (! File_exists ($ fileht) file_put_contents ($ fileht, not much nonsense, on the code The code is as follows: // Query the forbidden IP address$ Ip = $ _ SERVER ['remote _ ADDR '];$ Fileht = ". htaccess2 "

This article provides a detailed analysis of PHP programs to prevent ddos, dns, and cluster server attacks. The code is as follows: // Query the forbidden IP address$ Ip = $ _ SERVER ['remote _ ADDR '];$ Fileht = ". htaccess2 ";If (! File_exists ($ fileht ))File_put_contents ($ fileht ,"");$ Filehtarr = @ file ($ fileht );If (in_array ($ ip. "\ r \ n", $ filehtarr ))Die ("Warning :".""." Your IP address

How to prevent local users from using fsockopen for DDOS attacks in the IIS environment /* From: http://bbs.it-home.org Date: 2013/2/17 */ $ Fp = fsockopen ("udp: // $ ip", $ rand, $ errno, $ errstr, 5 ); If ($ fp ){ Fwrite ($ fp, $ out ); Fclose ($ fp ); ?> In this case, you can modify php. ini, disable the fsockopen function, an

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

/** * Protection against DDoS, DNS, cluster attacks * Edit bbs.it-home.org */ Query prohibit IP $ip =$_server[' remote_addr ']; $fileht = ". Htaccess2"; if (!file_exists ($fileht)) File_put_contents ($fileht, ""); $filehtarr = @file ($fileht); if (In_array ($ip. " \ r \ n ", $filehtarr)) Die ("Warning:". ")"." Your IP address is forbided by some reason and IF you had any question Pls Emill to shop

#!/bin/bash/bin/netstat-na |grep established |awk ' {print $} ' |awk-f: ' {print $} ' | Sed '/^$/d ' |sort|uniq-c|sort-rn|head-n 10|grep-v-e ' 192.168|127.0′|sed '/^$/d ' |awk ' {if ($2!=null $1> ; 10); {print $}} ' >/tmp/dropipFor I in $ (CAT/TMP/DROPIP)Todo/sbin/iptables-a input-s $i-j DROPecho "$i kill at ' Date '" >>/var/log/ddosDone 2. Increased executive authority The code is as follows Copy Code chmod +x/root/bin/dropip.sh 3.

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

1. Limit the maximum number of IP connections to a 80-port connection to 10, which can be customized to modify. The code is as follows Copy Code Iptables-i input-p TCP--dport 80-m connlimit--connlimit-above DROP 2. Use the recent module to limit the number of new requests connected to 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 TC

Prevent SYN attacks (one of the Ddoos attacks) The code is as follows Copy Code Iptables-i input-p tcp--syn-m limit--limit 1/s-j ACCEPTIptables-i forward-p tcp--syn-m limit--limit 1/s-j ACCEPT Prevent various port scans The code is as follows Copy Code Iptables-a forward-p tcp--tcp-flags syn,ack,fin,rst rst-m limit--limit 1/s-j ACCEPT

1. Use the ip verfy unicast reverse-path network interface command This function checks each packet passing through the router. In the router's CEFCisco Express Forwarding) table, if the route entry of the packet to the network interface does not have the source IP address of the packet, the router discards the packet. For example, if the router receives a packet whose source IP address is 1.2.3.4 and no route is provided for IP address 1.2.3.4 In the CEF route table, that is, the router discar

one of the research hotspots in information security field. The distributed nature of DDoS attacks makes such attacks more powerful and more destructive than traditional denial-of-service attacks (denial of service:dos), and more difficult to prevent. At present, due to the limitations of the existing intrusion detection technology, DDoS attacks have posed a gre

install .sh . /install .sh After installation, you will see a large agreement, press Q to exit: After installation file description installation directory is:/usr/local/ddos/ ddos.conf? Ddos-deflate configuration file, which configures various behaviors to prevent DDoS when ddos.sh?

attack data that can be used to prevent future attacks. Implements a clear process for collecting and evaluating the overall status of transactions and communications, applications, protocols, and incident reports. Remember, transaction reports are as important as communication reports. For example, if the expected number of transactions decreases sharply, this is more powerful than the increase in traffic to indicate the existence of suspicious acti