![]() ![]() Sometimes we are not able to access the website, or the server, for that, we need to whitelist their IP address manually with the following command: Pkts bytes target prot opt in out source destinationĬhain FORWARD (policy ACCEPT 0 packets, 0 bytes)Ĭhain OUTPUT (policy ACCEPT 0 packets, 0 bytes) You will receive the following output: :~# iptables -nvLĬhain INPUT (policy ACCEPT 0 packets, 0 bytes) Since, we installed the iptables service and did not add any rules, checking the iptables rules should give you empty output. Once, we have installed the iptable service and we have not added any rules, Read out the iptables rules should give you empty output. Since the iptables service is installed, we need to proceed with the basic iptables rules in the next paragraphs. Use the following command to install the iptables service: sudo apt-get install iptables -y Once the system has been updated, we will illustrate the fundamental iptables commands in Linux. User privileges: root or non-root user with sudo privilegesīefore we begin with the fundamental iptables rules, we will update the system packages to the most recent versions available.In this article, we will use Ubuntu 22.04 as the operating system, but you can use any distro if you want to try these iptables commands on your own. Iptables rules are stored in tables with chains for each defined rule. The iptables rules in the firewall, written by system administrators or users familiar with Linux servers, control the traffic. ![]() On Linux servers, iptables is used to control incoming and outgoing web traffic. In this article, we will go over 10 useful iptables commands that are applicable to any Linux distribution.
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