How do I disable firewall on CentOS or Red Hat Enterprise Linux server version 5.x/6.x running on my HP micro server?

You need to disable the following services to disable firewall under Red Hat Enterprise Linux or CentOS Linux version 4 / 5 / 6. The following commands also works on Fedora or Scientific Linux older version.

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RHEL / Centos Linux Disable Firewall Command Line Option

The following two services are used by RHEL / CentOS 6.x:

1. /etc/init.d/iptables – IPv4 iptables firewall service.
2. /etc/init.d/ip6tables – IPv6 iptables firewall service.

You can use the service command to control firewall settings on RHEL or CentOS based systems.

Task: Disable firewall on RHEL

First login as root user either using the su command or sudo command:
su -
OR
sudo -
Type the following command as the root user to disable firewall for IPv4:
# service iptables save
# service iptables stop
# chkconfig iptables off
Sample outputs:

iptables: Flushing firewall rules:                         [  OK  ]
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Unloading modules:                               [  OK  ]

Sample output with verification (see below):

Type the following command as the root user to disable firewall for IPv6 :
# service ip6tables save
# service ip6tables stop
# chkconfig ip6tables off

ip6tables: Flushing firewall rules:                        [  OK  ]
ip6tables: Setting chains to policy ACCEPT: filter         [  OK  ]
ip6tables: Unloading modules:                              [  OK  ]

Disable firewall on CentOS 6

You can also use the following command:
# /etc/init.d/iptables save
# /etc/init.d/iptables stop
# chkconfig iptables off
## IPv6 firewall
# /etc/init.d/ip6tables save
# /etc/init.d/ip6tables stop
# chkconfig ip6tables off

Task: Enable firewall

Type the following command as the root user to enable firewall for IPv4:
# service iptables start
# chkconfig iptables on
Sample outputs:

iptables: Applying firewall rules:                         [  OK  ]

Type the following command as the root user to disable firewall for IPv6 :
# service ip6tables start
# chkconfig ip6tables on

Task: Verify that firewall is disabled

Type the following command as root user to see IPv4 firewall rules:
# /sbin/iptables -L -v -n
OR
# service iptables status
The following output indicates that firewall is not active:

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Type the following command as root user to see IPv6 firewall rules:
# /sbin/ip6tables -L -v -n
OR
# service ip6tables status

Check out related media

This tutorial is also available in a quick video format:

(Video 01: CentOS / Red Hat IPTABLES: Deleting [DROP] and Flushing All Firewall Rules )

Conlusion

You learned how to turn off and disable RHEL and CentOS Linux firewall using the command line options. For more info see the following tutorials:

• CentOS / Redhat Iptables Firewall Configuration Tutorial
• Linux Configure Firewall Using Shorewall Under RHEL / CentOS
• Linux: 20 Iptables Examples For New SysAdmins
• Man pages: service(8)