$ sudo iptables -A OUTPUT -p icmp -icmp-type echo-reply -j DROP Or else, you can add the following rules in order to block ping without printing an error message: $ sudo iptables -A INPUT -p icmp -icmp-type echo-request -j DROP The command will print an error message when you run the ping command: $ sudo iptables -A INPUT -p icmp -icmp-type echo-request -j REJECT You can add the following rule in order to block pings to and from the server. In order to verify the installation and check the version number, you can use the following command: $ iptables -version Block PingĪs mentioned above, the iptables firewall is based on some set of rules. You can open the Terminal application either through the system application launcher search or by using the Ctrl+Alt+T shortcut. You can install iptables through the Linux command line by running the following command in your Terminal: $ sudo apt-get install iptables We have run the commands and procedures mentioned in this article on an Ubuntu 22.04 LTS system. Remove the rule that tells the iptables firewall to allow pings to and from a server by controlling the ICMP requests.

Add a rule that tells the iptables firewall to block incoming and outgoing pings to a server by controlling ICMP requests.In this article we will explain the iptables commands that you can use to: It also helps you estimate the time it takes to send and receive a response from the network. Ping or Packet Internet Groper is a network management utility that lets you check the connection status between a source and a destination computer/device over an IP network. The company releases stable versions from time to time, which can be downloaded from the following repository:Ĭompany website: To learn more about iptables and how to use it, follow the official documentation at: It is written in the C language and was first released in 1998. The packet filter iptables was first written by Rust Seller and is a product of the Netfilter Core team. If a rule is not found, it falls back to the default action and prevents access to the new connection. When a program tries to connect to your system, iptables looks for a rule from a predefined list. Iptables takes a packet-based approach to monitor traffic. Iptables is a command-line firewall program that allows or blocks traffic based on the policy chain used.

Ubuntu iptables