Disable ipv6 completely and remove related code

Co-Authored-By: Claude.ai

4 files changed, 7 insertions, 61 deletions

diff --git a/roles/pihole/README.md b/roles/pihole/README.md
index e7e0bb20..2f2383ab 100644
--- a/roles/pihole/README.md
+++ b/roles/pihole/README.md
@@ -37,54 +37,8 @@ This role configure the [pihole](https://github.com/pi-hole/pi-hole) DNS Sinkhol
 
 - Internet > Account Information > DNS Server > DNSv4 Server > Use Other DNSv4 Servers > {{ pihole_ipv4 }}
 
-#### No IPv6 Support (default)
-
 - Home Network > Network > Network Settings > Change Advanced Network Settings > IPv6 >
   - Router advertisement enable in the LAN > ❌
   - DNSv6 Server in the Home Network > Also announce DNSv6 server via router advertisement (RFC5006) > ❌
 
 - Internet > Account Information > IPv6 > IPv6 Support > ❌
-
-#### With IPv6 Support
-
-Setup is a two-step process: first enable FritzBox RA to get the Pi's stable ULA address,
-then disable FritzBox RA so Pi becomes the sole IPv6 default router.
-
-**Step 1 — Enable FritzBox RA temporarily to get Pi's ULA address:**
-
-- Internet > Account Information >
-  - IPv6 > IPv6 Support > ✅
-  - IPv6 > IPv6 Connectivity > Native IPv4 connection > Use IPv6 via landline connection or Mobile network > ✅
-  - IPv6 > Connection Settings > Use DHCPv6 Rapid Commit > ❌
-  - IPv6 > Connection Settings > Require certain length of the LAN prefix > ❌
-
-- Home Network > Network > Network Settings > Change Advanced Network Settings > IPv6 >
-  - Router advertisement enable in the LAN > ✅
-    - Always assign ULA addresses > ✅
-    - Set ULA prefix > https://www.unique-local-ipv6.com/ example: `fd00:1234:5678::` > ✅
-    - This FRITZ!Box provides the standard internet connection > Low
-  - DNSv6 Server in the Home Network >
-    - Also announce DNSv6 server via router advertisement (RFC5006) > ✅
-    - Local DNSv6 Server > {{ pihole_ipv6 `ip address | grep "inet6 fd"`}}
-  - DHCPv6 Server in the home network >
-    - Disable DHCPv6 server in the FRITZ!Box for the home network > ✅
-      - There are no other DHCPv6 servers in the home network. > ✅
-
-- Internet > Account Information > Internet DNS Server > DNSv6 Server > Use Other DNSv6 Servers > {{ pihole_ipv6 }}
-
-On the Pi, get the ULA address and the FritzBox link-local default route:
-```bash
-ip address | grep "inet6 fd"         # use the mngtmpaddr address as pihole_ipv6
-ip -6 route show default | grep ra   # use the nexthop as network_ipv6_gateway in rpi5 host_vars
-```
-
-Set `network_ipv6_gateway` in `host_vars/rpi5.local.yml` and run the playbook to deploy the static IPv6 route on Pi.
-
-**Step 2 — Disable FritzBox RA so Pi becomes sole IPv6 default router:**
-
-- Home Network > Network > Network Settings > Change Advanced Network Settings > IPv6 >
-  - Router advertisement enable in the LAN > ❌
-
-NOTE: Pi's radvd (deployed by the `gateway` role) takes over sending RAs with `AdvDefaultPreference high`.
-All LAN devices use Pi as their IPv6 default router → traffic routes VPN or direct mode.
-Pi keeps IPv6 connectivity via the static route to FritzBox set in Step 1.
diff --git a/roles/pihole/defaults/main.yml b/roles/pihole/defaults/main.yml
index d980c67c..e9d72266 100644
--- a/roles/pihole/defaults/main.yml
+++ b/roles/pihole/defaults/main.yml
@@ -2,12 +2,8 @@
 pihole_password: "{{ ('changeme' | hash('sha256') | hash('sha256'))[:64] }}"
 pihole_totp_secret: "CHANGEME"
 pihole_dns:
-  # Cloudflare
-  - "1.1.1.1"
-  - "2606:4700:4700::1111"
-  # Google
-  - "8.8.8.8"
-  - "2001:4860:4860:0:0:0:0:8888"
+  - "1.1.1.1" # Cloudflare
+  - "8.8.8.8" # Google
 pihole_interface: "eth0"
 pihole_dns_blocking_enabled: true
 pihole_dhcp_enabled: false
diff --git a/roles/pihole/meta/argument_specs.yml b/roles/pihole/meta/argument_specs.yml
index 40662436..c86fd5a0 100644
--- a/roles/pihole/meta/argument_specs.yml
+++ b/roles/pihole/meta/argument_specs.yml
@@ -15,12 +15,8 @@ argument_specs:
         description: "The list of DNS servers to use as upstreams"
         elements: "str"
         default:
-          # Cloudflare
-          - "1.1.1.1"
-          - "2606:4700:4700::1111"
-          # Google
-          - "8.8.8.8"
-          - "2001:4860:4860:0:0:0:0:8888"
+          - "1.1.1.1" # Cloudflare
+          - "8.8.8.8" # Google
       pihole_interface:
         type: "str"
         description: "The interface to bind the pi-hole on"
diff --git a/roles/pihole/tasks/main.yml b/roles/pihole/tasks/main.yml
index ccd4bd9f..63e034d8 100644
--- a/roles/pihole/tasks/main.yml
+++ b/roles/pihole/tasks/main.yml
@@ -1,8 +1,8 @@
 ---
-- name: "Validate network_ipv*_dns params"
+- name: "Validate network_ipv4_dns param"
   ansible.builtin.fail:
-    msg: "Pihole role cannot work when network_ipv4_dns or network_ipv6_dns are defined"
-  when: network_ipv4_dns is defined or network_ipv6_dns is defined
+    msg: "Pihole role cannot work when network_ipv4_dns is defined"
+  when: network_ipv4_dns is defined
 
 - name: "Validate pihole_dhcp_* params"
   ansible.builtin.assert: