iptables ddos rules

I. Viewing an attacker's IPawk ' {print $} ' Cut Sort Uniq Sort -NTwo. Installing the DDoS deflate#wget http:// // download DDoS deflate#chmod0700 Install. SH // Add permissions #./install. SH // ExecutionThree. Configuring DDoS deflateThe following is the default configuration of the DDoS deflate in/usr/local/

; border-bottom-width: 0px; border-left-width: 0px; border-right -: "title =" image "border =" 0 "alt =" image "width =" 370 "height =" 92 "src =" http://www.bkjia.com/uploads/allimg/131227/0P3244129-0.png "/> 3. There is a very practical script to prevent DDos attacks. #! /Bin/bash Netstat-an | grep SYN_RECV | awk '{print $5}' | awk-F: '{print $1}' | sort | uniq-c | sort-rn | awk '{if ($1> 1) print $2 }' For I in $ (cat/tmp/dropip) Do /Sbin/

iptables1.3.7 and system kernel versions Kernel-smp-modules-connlimit 3. Configure the corresponding iptables rules Examples are as follows: (1) Control the maximum number of concurrent connections for a single IPIptables-i input-p TCP--dport 80-m connlimit--connlimit-above 25-j REJECT #允许单个IP的最大连接数为25个 #早期iptables模块不包含connlimit, you need to compile the load

In IDCs, hardware firewalls are usually used to prevent DDOS and CC attacks. IPtables can provide good protection for a small amount of attacks. 1. firewall enabling/disabling in Linux Command 1) permanently effective. it will not be enabled after restart: chkconfigiptableson disabled: chkconfigiptablesoff2) effective immediately, in IDCs, hardware firewalls are usually used to prevent

the entry of the target group and returns a connection refused error message to the user attempting to connect to the service. DROP will discard the group and will not send any warning to the telnet user. The rule added by the command takes effect temporarily. After the iptables service is restarted, it will be restored. You can save the Command service iptables save permanently or directly modify the con

Detailed description of Linux iptables firewall + anti-DDOS policy configuration 650) this. width = 650; "alt =" "border =" 0 "src =" http://www.bkjia.com/uploads/allimg/131227/0T2502549-0.jpg "/> The network firewall function has been implemented in the Linux kernel for a long time. In different Linux kernel versions, different software is used to implement the firewall function.In the 2.0 kernel, the fire

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

Relationship between iptables rules and between iptables rules The relationship between iptables rules is ignored from top to bottom.Therefore, when adding rules, you must add them thro

An example of iptables anti-DDoS method Mitigating DDoS attacks#防止SYN攻击, lightweight prevention Iptables-n Syn-floodIptables-a input-p tcp–syn-j Syn-floodIptables-i syn-flood-p tcp-m limit–limit 3/s–limit-burst 6-j returnIptables-a syn-flood-j REJECT #防止DOS太多连接进来, you can allow the external network card to each IP u

Anti-DDoS script # Lightweight prevention against SYN AttacksIptables-N syn-floodIptables-A input-p tcp-syn-J syn-floodIptables-I syn-flood-P TCP-m limit-limit 3/s-limit-burst 6-J returnIptables-a syn-flood-J reject # Prevent too many Dos connections. You can allow up to 15 Initial connections from each IP address of the Internet Nic, exceeding the limit of discardingIptables-A input-I eth0-P TCP-syn-M connlimit-abve 15-J DropIptables-A input-p tcp-M

Mitigating DDoS attacks#防止SYN攻击, lightweight preventionIptables-n Syn-floodIptables-a input-p tcp–syn-j Syn-floodIptables-i syn-flood-p tcp-m limit–limit 3/s–limit-burst 6-j returnIptables-a syn-flood-j REJECT #防止DOS太多连接进来, you can allow the external network card to each IP up to 15 initial connections, over the discardedIptables-a input-i eth0-p tcp–syn-m connlimit–connlimit-above 15-j DROPIptables-a input-p tcp-m state–state established,related-j

Defense against DDOS attacks # lightweight prevention of SYN Attacks iptables-N syn-flood iptables-a input-p tcp -- syn-j syn-flood iptables-I syn-flood-p tcp- m limit -- limit 3/s -- limit-burst 6-j RETURN iptables-A syn-flood-j REJECT # prevent too many DOS connections, ea

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