How to Use “iptables” Command in Linux [6 Practical Examples] | LinuxSimply

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Looking to bolster your Linux networking skills? Enter iptables – your gateway to robust packet filtering and network address translation (NAT). In this tutorial, we'll dive into the essentials of iptables, unraveling its capabilities with 6 practical examples to empower you in shaping network traffic, enforcing security policies, and safeguarding your system against intruders.

The iptables command in Linux is used to set up, maintain and inspect the tables of IP packet filters. These tables contain built-in chains which are basically a set of rules to match packets going through the network. Each rule defines the action performed on a set of packets. Whether you're a seasoned pro or new to Linux networking, mastering iptables is crucial for optimizing network performance and fortifying system security.

💡 Key Topics Covered:

1. Understanding the syntax and options of the iptables command.
2. Displaying netfilter firewall status.
3. Checking if a rule is present in the tables
4. Inserting/deleting firewall rules
5. Blocking an IP address

Don't miss out on this tutorial as I guide you through each example step-by-step and become a pro in Linux networking today! – Subscribe to the channel and click on the notification icon so you’ll never miss a lesson! Check out the articles for more insights on the ip command in Linux.👇

📜⯆ Content Index
0:00 Intro
0:15 What is iptables Command?
1:13 Re-Activating Firewall for Using the “iptables” Command in Linux
1:49 Example 1: Displaying Netfilter Firewall Status Using the “iptables” Command in Linux
2:18 Example 2: Displaying Firewall Rules With Line Numbers Using the “iptables” Command in Linux
2:42 Example 3: Checking If a Rule is Present in the Tables Using the “iptables” Command in Linux
3:26 Example 4: Inserting Firewall Rules Using the “iptables” Command in Linux
4:26 Example 5: Deleting Firewall Rules Using the “iptables” Command in Linux
5:17 Example 6: Blocking an IP Address Using the “iptables” Command in Linux
6:22 Outro

Instructor Details
Shahriar Abrar Rafid

Editor Details
Prantik Chowdhury

📚 ⯆ Read the Full Article
The “iptables” Command in Linux [6 Practical Examples] https://linuxsimply.com/iptables-command-in-linux/

📝⯆ Commands Used
Re-Activating Firewall for Using the “iptables” Command in Linux

sudo ufw disable
sudo iptables --flush
sudo ufw enable
Example 1: Displaying Netfilter Firewall Status Using the “iptables” Command in Linux
1.sudo iptables -n -L -v

Example 2: Displaying Firewall Rules With Line Numbers Using the “iptables” Command in Linux
1.sudo iptables -n -L -v --line-numbers

Example 3: Checking If a Rule is Present in the Tables Using the “iptables” Command in Linux
1.sudo iptables -t filter --check INPUT -s 192.168.254.0 -j DROP

Example 4: Inserting Firewall Rules Using the “iptables” Command in Linux
1.sudo iptables -I INPUT 2 -s 192.168.254.0 -j DROP

Example 5: Deleting Firewall Rules Using the “iptables” Command in Linux
1.sudo iptables -D INPUT -s 192.168.254.0 -j DROP

Example 6: Blocking an IP Address Using the “iptables” Command in Linux
1.sudo iptables -A INPUT -s 192.168.254.0 -j DROP
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