Question : How to disable firewalld and enable iptables instead?
Answer :
To switch to from firewalld to iptables follow the steps given below.
1. Firstly ensure the iptables-services package is installed.
# yum install -y -q iptables-services
2. Then prepare the iptables rules you wish to use by editing /etc/sysconfig/iptables and /etc/sysconfig/ipt6tables.
3. Next, disable and stop the firewalld service
# systemctl disable firewalld rm '/etc/systemd/system/basic.target.wants/firewalld.service' rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
# systemctl stop firewalld
4. Then start iptables services :
# systemctl start iptables # systemctl start ip6tables
5. Enable iptables service to automatically start at boot :
# systemctl enable iptables ln -s '/usr/lib/systemd/system/iptables.service' '/etc/systemd/system/basic.target.wants/iptables.service' # systemctl enable ip6tables ln -s '/usr/lib/systemd/system/ip6tables.service' '/etc/systemd/system/basic.target.wants/ip6tables.service'