chore: remove all IPv6 functionality

tasks/routing.yaml

@@ -4,20 +4,30 @@
   community.general.apk:
     name:
       - "iptables"
-      - "ip6tables"
     state: "present"
     update_cache: true
 
-- name: "enable ipv4 forwarding"
+- name: "configure ipv4 forwarding"
   ansible.posix.sysctl:
-    name: "net.ipv4.ip_forward"
+    name: "net.ipv4.conf.all.forwarding"
     value: "1"
-    sysctl_set: true
-    state: present
+    state: "present"
+    sysctl_file: "/etc/sysctl.conf"
+    reload: false
 
-- name: "enable ipv6 forwarding"
+- name: "disable ipv4 redirects and source routing"
   ansible.posix.sysctl:
-    name: "net.ipv6.conf.all.forwarding"
-    value: "1"
-    sysctl_set: true
-    state: present
+    name: "{{ item.name }}"
+    value: "{{ item.value }}"
+    state: "present"
+    sysctl_file: "/etc/sysctl.conf"
+    reload: false
+  loop:
+    - name: "net.ipv4.conf.all.accept_redirects"
+      value: "0"
+    - name: "net.ipv4.conf.all.send_redirects"
+      value: "0"
+    - name: "net.ipv4.conf.all.accept_source_route"
+      value: "0"
+    - name: "net.ipv4.conf.all.log_martians"
+      value: "0"