![]() Note: If you want to use all of the parameters, you need to type the iptables command on Ubuntu 20.04 in the order shown below: sudo iptables -A -i -p -s -dport -j You need to insert this every time you make a new rule. j: the target name (ACCEPT, DROP, RETURN). dport: the destination port number of a protocol, such as 22 (SSH), 443 (https), etc. s: the address from which traffic comes. Also, you can type all to choose every protocol. It can be either TCP, UDP, udplite, ICMP, SCTP, icmpv6, and so on. p: the network protocol where your filtering process takes place. i: the network interface whose traffic you want to filter, such as eth0, lo, ppp0, etc. To do this, you can use -A parameter after the iptables command on Ubuntu 20.04 as shown below: sudo iptables -A Īlso, you can combine the command with other parameters like: It means that you can append it to the chain. Now that you have installed iptables on Ubuntu 20.04, let’s see some basic usage of it. Pkts bytes target prot opt in out source destinationĬhain FORWARD (policy ACCEPT 0 packets, 0 bytes)Ĭhain OUTPUT (policy ACCEPT 0 packets, 0 bytes) L parameter is for the list of all rules, and the -v parameter is used to show information in more detail.Ĭhain INPUT (policy ACCEPT 0 packets, 0 bytes) You can check your iptables configuration with the following command: sudo iptables -L -v If you don’t have it, then, you can use the following command to install an iptables firewall on your server: sudo apt install iptables Install iptables on Ubuntuįirst, update your local package index with the following command: sudo apt updateīy default, iptables come pre-installed in most Linux distributions. Now follow the steps below to install iptables on Ubuntu 20.04. ![]() To do this, you can follow our article the Initial Server Setup with Ubuntu 20.04. ![]() To install iptables on Ubuntu 20.04, you need to log in to your server as a non-root user with sudo privileges. ![]() ![]() Steps To Install and Use Iptables Firewall on Ubuntu 20.04 If it doesn’t find one, it resorts to the default action. When a connection tries to establish itself on your system, iptables looks for a rule in its list to match it to. Iptables is a command-line firewall utility that uses policy chains to allow or block traffic. In this article, we want to teach you How To Install and Use Iptables Firewall on Ubuntu 20.04. ![]()
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