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This article mainly introduces which commands are commonly used in Linux firewall, the article is very detailed, has a certain reference value, interested friends must read it!

The firewall system of Linux mainly works in the network layer, which implements filtering and restriction on TCP/IP packets, which is a typical packet filtering firewall (or network layer firewall). In Linux, both netfilter and iptables refer to the Linux firewall. The difference is:

Netfilter: refers to the internal structure of the packet filtering firewall in the Linux kernel, which does not exist in the form of programs or files, and belongs to the "kernel state" firewall function system.

Iptables: refers to the command program used to manage the Linux firewall, usually located in / sbin/iptables, belonging to the "user mode" firewall management system.

1. Iptables Firewall

1. Basic operation

View firewall status

Service iptables status

Stop the firewall

Service iptables stop

Start the firewall

Service iptables start

Restart the firewall

Service iptables restart

Permanently turn off the firewall

Chkconfig iptables off

Restart after permanent shutdown

Chkconfig iptableson

II. Firewall (firewall)

1. View the status of firewall service

Systemctl status firewalld

When Active: active (running) is highlighted, it indicates that it is in the starting state.

The appearance of Active: inactive (dead) gray indicates stop, or look at the word.

2. Check the status of firewall

Firewall-cmd-state

3. Enable, restart, shut down, and firewalld.service services

open

Service firewalld start

Restart

Service firewalld restart

Close

Service firewalld stop

4. View firewall rules

Firewall-cmd-list-all

5. Query, open and close the port

Query whether the port is open

Firewall-cmd-query-port=8080/tcp

Open port 80

Firewall-cmd-permanent-add-port=80/tcp

Remove Port

Firewall-cmd-permanent-remove-port=8080/tcp

Restart the firewall (restart the firewall after changing the configuration)

Firewall-cmd-reload

Parameter interpretation

1. Firwall-cmd: a tool for operating firewall provided by Linux

2.-- permanent: set to persistent

3.-- add-port: identifies the added port

The above is all the contents of this article "what are the commands commonly used in Linux Firewall?" Thank you for your reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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