Question

Host-based firewall (Linux) Lab exercise:

1. Install iptables on your Kail or Ubuntu system.
2. Set the default policy to ACCEPT for all three chains including the INPUT, FORWARD, and OUTPUT chains. Sample command: iptables –P INPUT DROP iptables –P FORWARD DROP iptables –P INPUT DROP
3. Add an input policy: iptables –A INPUT –I lo –j ACCEPT
4. List the rules with rule names iptables –L –line-number
5. List the rules with rule numbers iptables –L –line-number

Answer 1

To install iptables on a Kali or Ubuntu system and configure the default policy to ACCEPT for all three chains, you can use specific commands. Additionally, you can add an input policy to allow traffic on the loopback interface. To view the rules, you can use the 'iptables -L' command with appropriate options.

Step-by-step explanation:

To install iptables on a Kali or Ubuntu system, you can use the following command: sudo apt-get install iptables. After the installation, you can set the default policy to ACCEPT for all three chains by running the commands: iptables -P INPUT ACCEPT, iptables -P FORWARD ACCEPT, and iptables -P OUTPUT ACCEPT. To add an input policy that allows traffic on the loopback interface, you can use the command: iptables -A INPUT -i lo -j ACCEPT. To list the rules with rule names, you can run the command: iptables -L -v --line-numbers. And to list the rules with rule numbers, you can use the command: iptables -L -n --line-numbers.