You can use this post for centos firewall configuration .

 

Disable ipv4 firewall :

service iptables save
service iptables stop
chkconfig iptables off

Disable ipv6 firewall :

service ip6tables save
service ip6tables stop
chkconfig ip6tables off

Enable IPv4 firewall :

service iptables start
chkconfig iptables on

 

Enable IPv6 firewall :

service ip6tables start
chkconfig ip6tables on

 

if you need to check firewll status you can use code below :

service iptables status

service ip6tables status

 Centos Firewall Configuration

Kind regards

MonoVM.com