firewall-cmd 不會阻止指定的端口

Question

我新增了一條豐富規則來阻止與 DNS 伺服器的連接，以便測試另一個進程，並且封包捕獲顯示由以下豐富規則指定的 IP 位址發送的封包仍然被接受。

block
  interfaces: 
  sources: 
  services: 
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 

dmz
  interfaces: 
  sources: 
  services: ssh
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 

drop
  interfaces: 
  sources: 
  services: 
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 

external
  interfaces: 
  sources: 
  services: ssh
  ports: 
  masquerade: yes
  forward-ports: 
  icmp-blocks: 
  rich rules: 

home
  interfaces: 
  sources: 
  services: dhcpv6-client ipp-client samba-client ssh
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 

internal
  interfaces: 
  sources: 
  services: dhcpv6-client ipp-client samba-client ssh
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 

public (default, active)
  interfaces: eno16780032
  sources: 
  services: dhcpv6-client samba ssh
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 
        rule family="ipv4" source address="10.7.6.11/32" drop
trusted
  interfaces: 
  sources: 
  services: 
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 

work
  interfaces: 
  sources: 
  services: dhcpv6-client ipp-client ssh
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: