You can prevent such problems by adding traffic control rules in your iptables firewall using below command: # iptables -A INPUT -p tcp -dport 80 -m limit -limit 100/minute -limit-burst 200 -j ACCEPT It can cause several issues to down your websites. Sometimes you get numbers of connection on your network interface, because of IP address may request too many connections on web ports on your website or application. Block network flood on http port using iptables You can change the port as per your requirements. The above command will configure an iptables rule which forwards all incoming traffic on network interface “eth0”, from port 25 to 2525. # iptables -t nat -A PREROUTING -i eth0 -p tcp -dport 25 -j REDIRECT -to-port 2525 You will get lots of chance to block IPs on your iptables firewall, especially we are doing it when we find any unusual or abusive activity on our system from an IP. For example, to check NAT table use following command: # iptables -t nat -L -v -n Block specific IP address in iptables firewall To check rules of specific table use “-t” option followed by the table name. There is also an option to check the configured rules for a specific table. You will get the output like below: Chain INPUT (policy ACCEPT 1129K packets, 415M bytes) You can check existing configured iptables rules by using the following command: # iptables -L -n -v # /etc/init.d/iptables restart Check all configured iptables firewall rules
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