group_vars/all: Changed default dns servers to normal Quad9

- in distinction to Quad9 servers supporting/using EDNS
- the default servers have EDNS disabled

group_vars/all/vars.yml

@@ -118,10 +118,11 @@ global_chromium_configuration_directory: "/etc/chromium"
 global_chromium_managed_policies_file: "{{ global_chromium_configuration_directory }}/policies/managed/managed_policies.json"
 
 global_dns_upstream_servers:
-  - "9.9.9.11"
-  - "149.112.112.11"
-  - "2620:fe::11"
-  - "2620:fe::fe:11"
+  # Quad9 DNS with DNSSEC support, without EDNS
+  - "9.9.9.9"
+  - "149.112.112.112"
+  - "2620:fe::fe"
+  - "2620:fe::9"
 
 global_dnsmasq_configuration_file: "/etc/dnsmasq.conf"
 global_dnsmasq_configuration_directory: "/etc/dnsmasq.d"