iptables configures the of and etc and sysconfig and iptables operation method

As follows:

iptables -A INPUT -p tcp --dport 22 -j ACCEPT

iptables -A INPUT -p tcp --dport 22 -j ACCEPT

iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT

# save

sudo /etc/rc.d/init.d/iptables save

or

sudo service iptables save

# restart iptables

sudo service iptables restart

# check

sudo iptables --line-numbers -n -L

# close firewall

sudo service iptables stop

sudo chkconfig iptables off

sudo service ip6tables stop

sudo chkconfig ip6tables off

sudo setenforce 0

sudo getenforce

Check vi /etc/selinux/config to ensure the following

SELINUX=disabled

Check to see if it is closed.

sudo chkconfig iptables --list