Shulou(Shulou.com)06/01 Report--

This article mainly introduces "how to set firewall in Linux". In daily operation, I believe many people have doubts about how to set firewall in Linux. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to set firewall in Linux". Next, please follow the editor to study!

Question: due to the requirements of scientific research, most of our department did not use the Windows system, but used Linux, very unaccustomed, a boot is a black interface, like the legendary DOS. Fortunately, the software that does scientific research has instructions, but the firewall of Linux is not mentioned. I am very worried about worms or backdoor invasions. How can I start it?

Answer: because you don't specify which Linux distribution it is, but the underlying things of Linux are basically the same, so the method given to you by editor is effective for most distributions. Linux's own firewall is called "iptables". The black one you're talking about is the terminal. Enter the following command in the terminal to turn on the firewall:

Chkconfig iptables on

If the firewall is closed, enter:

Chkconfig iptables off

Both of these commands will not take effect until the system is restarted.

If you don't want to take effect immediately by rebooting the system, you can use the "service" command. The disadvantage is that the settings will be lost after rebooting the system.

Firewall turned on:

Service iptables start

Turn off the firewall:

Service iptables stop

To set the switch for some ports in the firewall, modify the edit / etc/sysconfig/iptables file, such as opening SSH port 22, and add the following:

-A RH-Firewall-1-INPUT-m state-- state NEW-m tcp-p tcp-- dport 22-j ACCEPT

At this point, the study on "how to set up a firewall in Linux" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.