[...For internet users, any effects are not likely to be felt until IPv6-only services start appearing. If ISPs haven't upgraded their networks by then, those parts of the internet will be inaccessible to their customers.]
"Welcome to the FirewallD project homepage!
FirewallD provides a dynamically managed firewall with support for network/firewall zones to define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings and for ethernet bridges and has a separation of runtime and permanent configuration options. It also supports an interface for services or applications to add firewall rules directly."