#linuxdistributions

Linux Firewall

Introduction Firewall Status Stopping Firewall Disable FIrewall Enable Firewall Start Firewall Conclusion > Introduction: A firewall is a network security program that controls the incoming and outgoing connections based on the rules that are set. Linux has a default firewall i.e., iptables. Firewalld is a  firewall management solution available for many Linux distributions which acts as a frontend for the iptables service provided by the Linux kernel.  Firewalld installed by default in major linux distributions. > Firewall Status: We can check firewall service status by executing the below command. (firewall enabled by default). # systemctl status firewalld ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2019-05-04 03:41:57 EDT; 5h 0min ago Docs: man:firewalld(1) Main PID: 4523 (firewalld) ....  .... ..... .... Looks like below.

> Stopping firewall: We can stop the firewall by using this command. # systemctl stop firewalld

> Disable Firewall: We can disable the firewall to stop while the system is booting. by using this command. # systemctl disable firewalld

> Enable Firewall: If you want to enable the firewall to configure security rules for your system. then we can use this command to enable the firewall. systemctl enable firewalld

> Start Firewall: To start firewall service or firewall daemon we need to use this command. # systemctl start firewalld