-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 the -A parameter after the iptables command on Ubuntu 22.04 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. In this part, we intend to show you some basic usage of iptables on your server. Now that you have installed iptables on Ubuntu 22.04, 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)

The -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 Set up iptables firewall on Ubuntu 22.04įirst, 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 complete this guide. To do this, you can follow our article the Initial Server Setup with Ubuntu 22.04. To install iptables on Ubuntu 22.04, you must log in to your server as a non-root user with sudo privileges. You can use iptables to filter both incoming and outgoing packets as well as route network packets. Netfilter is the firewall framework on Linux, and iptables is the utility that is used to manage and control Netfilter. The filters are organized into tables containing chains of rules which govern how to treat network traffic packets. Implemented as Netfilter modules, iptables is a user-space utility program that allows a system administrator to configure the IP packet filter rules of the Linux kernel firewall. In this guide, we want to teach you How To Install and Use Iptables on Ubuntu 22.04.

Ubuntu iptables