Method Example for linux Firewall Status Viewing

The Method of linux Firewall State Viewing

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 close the firewall 
chkconfig iptables off
#  Restart after permanent shutdown 
chkconfig iptables on

2. Open Port 80

vim /etc/sysconfig/iptables
#  Add the following code 
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

Restart firewall after saving exit

service iptables restart

2. firewall Firewall

1. View firewall service status

systemctl status firewalld

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

The appearance of Active: inactive (dead) gray means stop, and the words will do.

2. View the status of firewall

firewall-cmd --state

3. Open, restart and close, firewalld. service service

#  Open service firewalld start#  Restart service firewalld restart#  Shut down service firewalld stop

4. View firewall rules

firewall-cmd --list-all

5. Query, open and close ports

#  Query whether the port is open 
firewall-cmd --query-port=8080/tcp
#  Open 80 Port 
firewall-cmd --permanent --add-port=80/tcp
#  Remove Port 
firewall-cmd --permanent --remove-port=8080/tcp
# Restart the firewall ( Restart the firewall after modifying the configuration )
firewall-cmd --reload

Parameter interpretation

1. firwall-cmd: It is a tool provided by Linux to operate firewall;

2,--permanent: indicates that it is set to persistence;

3.--add-port: Identify the added port;