How To Stop Icmp Flooding Attack

The term ICMP means Internet Control Message Protocol flood attack, otherwise known as Denial of Service attack (Dos) or Ping Flood Attack. The ICMP flood attack happens when an attacker sends a high volume of traffic to a system or device where the system or device is busy examining and cannot process other network traffic.In other words, ICMP echo-request and echo-reply messages are used to ping a network to identify the nature and the connection between the sender and the device. But, it forces the system to accept the flooding requests without diagnosing them and thus regular traffic on the network is affected.

The ICMP attacks are made in three methods as mentioned below.

  • Step 1:Attack on a specific computer: For this attack, the attacker must know the IP address of the target device earlier.
  • Step 2:Attack on a specific router: This attack is made to interrupt the communication between the router and computers on a network. For this attack, the attacker must know the IP address of the router.
  • Step 3:Blind attack: This attack may be targeted on any computer or router without knowing the IP address beforehand.

Stopping the ICMP flooding attack:

To stop the ICMP flooding attack, you have to disable the ICMP feature of your computer, router, or firewall. Usually, on routers, you have to disable the option for responding to ping requests. When your router stops responding to ping requests from the Internet, it will stop the ICMP flooding attacks on your network.The steps to stop ICMP flooding attacks by disabling the option to respond to ping requests on a Netgear router are given below.

  • Step 1:Open a browser on your computer connected to the Netgear router.
  • Step 2:Enter the Netgear router’s IP address or the router login address in the address bar.
  • Step 3:Enter the router’s admin name and password to log in to the router setup page.
  • Step 4:You will see two tabs --- Basic and Advanced. Select the Advanced tab.
  • Step 5:On the left panel, locate and click on the WAN Setup option under Setup.
  • Step 6:In the main panel, deselect the Respond to Ping on Internet Port option.
  • Step 7:Click on Apply to save the changes.
  • Step 8:This will stop the ICMP flooding attack on your network. In other routers, you will have options similar to Block ICMP Ping, etc. Choose the appropriate option to keep your network safe from flooding attacks.