Linux close and open firewall (Ubuntu, centos, Redhat)

、 、 Free

1. Turn off the firewall of ubuntu

  ufw disable

2. Turn on the firewall

 ufw enable

3. Uninstall iptables

   apt-get remove iptables

4. The remaining commands to close the firewall in ubuntu

    iptables -P INPUT ACCEPT
    iptables -P FORWARD ACCEPT
    iptables -P OUTPUT ACCEPT
    iptables -F

2. centos

Open the firewall:

service iptables start

Turn off the firewall:

service iptables stop

Check firewall status:

service iptables status

Three, redhat

3.1. Permanently shut down and take effect after restart:

On:

chkconfig iptables on

closure:

chkconfig iptables off

3.2. Temporarily open, invalid after restart:

On:

service iptables start

closure:

service iptables stop