How to open and close Linux firewalls

Source: Internet
Author: User
Tags iptables

1) effective after reboot

Open: Chkconfig iptables on

Close: Chkconfig iptables off

2) immediate effect, restart after failure

Open: Service iptables start

OFF: Service iptables stop

It should be explained that for other services under Linux, you can use the above command to perform the open and close operations.

When the firewall is turned on, make the following settings, open the relevant port,

Modify the/etc/sysconfig/iptables file and add the following:

-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 80-j ACCEPT

-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 22-j ACCEPT

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