Centos 7 – Firewall

Sample iptables Rules for CentOS/RHEL 7.x only

You need to use the following commands:
# firewall-cmd --permanent --zone=public --add-service=samba
# firewall-cmd --reload

OR
# firewall-cmd --permanent --add-port=137/tcp
# firewall-cmd --permanent --add-port=138/tcp
# firewall-cmd --permanent --add-port=139/tcp
# firewall-cmd --permanent --add-port=445/tcp