How to disable Firewalld in CentOS 7 and use iptables
You can disable Firewalld service in CnetOS 7 if you do not have command on this and instead of this you can use old firewall which is iptables in CentOS 7. Below the the steps to the same.
Steps to disable Firewalld in CentOS 7
# systemctl disable firewalld
# systemctl mask firewalld
# systemctl stop firewalld
# systemctl status firewalld
Install iptables-services in CnetOS 7
# yum install iptables-services -y
# systemctl enable iptables
# systemctl start iptables
# systemctl status iptables
Flush Iptables existing rule
# iptables -F
# service iptables save
# systemctl restart iptables
Steps to disable Firewalld in CentOS 7
# systemctl disable firewalld
# systemctl mask firewalld
# systemctl stop firewalld
# systemctl status firewalld
Install iptables-services in CnetOS 7
# yum install iptables-services -y
# systemctl enable iptables
# systemctl start iptables
# systemctl status iptables
Flush Iptables existing rule
# iptables -F
# service iptables save
# systemctl restart iptables