Konfiguration von firewalld mit firewall-cmd

firewall-cmd             --add-rich-rule="rule family='ipv4' source address='a.b.c.d' reject"
firewall-cmd --permanent --add-rich-rule="rule family='ipv4' source address='a.b.c.d' reject"
firewall-cmd             --add-rich-rule="rule family='ipv4' source address='a.b.c.d/nm' reject"
firewall-cmd --permanent --add-rich-rule="rule family='ipv4' source address='a.b.c.d/nm' reject"
firewall-cmd --list-rich-rules