How to turn LINUX Firewall on and off

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

1) take effect after restart

Enable: chkconfig iptables on

Turn off: chkconfig iptables off

2) effective immediately and expire after restart

Enable: service iptables start

Turn off: service iptables stop

It is important to note that you can use the above command to enable and close other services under Linux.

When the firewall is enabled, make the following settings to open the relevant port

Modify the / etc/sysconfig/iptables file to add the following:

-A RH-Firewall-1-INPUT-m state-- state NEW-m tcp-p tcp-- dport 80-j ACCEPT

-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 open and close the LINUX firewall" 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!