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This article mainly introduces linux how to check the firewall status, the article is very detailed, has a certain reference value, interested friends must read it!

Linux check firewall status: 1, iptables firewall, check firewall status, code is [service iptables status]; 2, firewall firewall, code is [firewall-cmd-- state].

How linux can view the status of the firewall:

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 iptables on

2. Open port 80

Vim / etc/sysconfig/iptables

# add the following code

-An INPUT-m state-- state NEW-m tcp-p tcp-- dport 80-j ACCEPT

Restart the firewall after saving exit

Service iptables restart

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

# enable

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: identify the added port

The above is all the contents of the article "how to check the Firewall status of linux". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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