I am a new CentOS Linux user and installed it on HP server. I updated /etc/sysconfig/iptables firewall config file. How do I restart a firewall on CentOS Linux version 5/6? How can I use command line to restart iptables on a CentOS server?

You can easily start or stop or restart firewall on a CentOS / Fedora / RHEL / Red Hat Linux server using the following syntax. You need to login as root user.

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CentOS Linux restart iptables command

The syntax is as follows to restart an IPv4 iptables based firewall:
# service iptables restart

The syntax is as follows to restart an IPv6 iptables based firewall:
# service ip6tables restart

CentOS Linux stop iptables command

The syntax is as follows to stop an IPv4 iptables based firewall:
# service iptables stop

The syntax is as follows to stop an IPv6 iptables based firewall:
# service ip6tables stop

CentOS Linux start iptables command

The syntax is as follows to start an IPv4 iptables based firewall:
# service iptables start

The syntax is as follows to start an IPv6 iptables based firewall:
# service ip6tables start

CentOS Linux get status of iptables command

The syntax is as follows to status of an IPv4 iptables based firewall:
# service iptables status

The syntax is as follows to status of an IPv6 iptables based firewall:
# service ip6tables status