no iptables no more – some things change faster than you can say „beneune„…
check if it is up and running:
systemctl list-unit-files|grep firewall firewalld.service enabled
open a port, permanently:
firewall-cmd --zone=public --add-port=80/tcp --permanent firewall-cmd --reload
„The former firewall model with system-config-firewall/lokkit was static and every change required a complete firewall restart. This included also to unload the firewall netfilter kernel modules and to load the modules that are needed for the new configuration. The unload of the modules was breaking stateful firewalling and established connections.
The firewall daemon on the other hand manages the firewall dynamically and applies changes without restarting the whole firewall. Therefore there is no need to reload all firewall kernel modules. But using a firewall daemon requires that all firewall modifications are done with that daemon to make sure that the state in the daemon and the firewall in kernel are in sync. The firewall daemon can not parse firewall rules added by the ip\*tables and ebtables command line tools.
The daemon provides information about the current active firewall settings via D-BUS and also accepts changes via D-BUS using PolicyKit authentication methods.“
official homepage http://firewalld.org