docs: improved documentation

readme.md

@@ -27,13 +27,33 @@ unbound_zones:
   - zone: "internal.example.com"
     type: "static"
     records:
+
+      # A records (default type)
       - name: "server1.internal.example.com"
         value: "10.0.1.10"
+
+      # AAAA record
       - name: "server2.internal.example.com"
-        value: "10.0.1.11"
+        type: "AAAA"
+        value: "2001:db8::1"
+
+      # CNAME record
+      - name: "internal.example.com"
+        type: "CNAME"
+        value: "server1.internal.example.com"
+
+      # MX record
+      - name: "internal.example.com"
+        type: "MX"
+        priority: 10
+        value: "mail.internal.example.com"
+
+      # TXT record
       - name: "internal.example.com"
         type: "TXT"
         value: "v=spf1 include:internal.example.com ~all"
+
+      # SRV record
       - name: "_sip._tcp.internal.example.com"
         type: "SRV"
         priority: 10
@@ -53,3 +73,22 @@ unbound_zones:
 | `TXT` | `name`, `value`, `type` | Text record |
 | `SRV` | `name`, `value`, `type`, `priority`, `weight`, `port` | Service locator |
 | `PTR` | `name`, `value`, `type` | Pointer record |
+
+## Reverse DNS
+
+Reverse DNS (PTR) records are **automatically generated** for IPv4 A records in the following networks:
+
+- `192.168.x.x/16`
+- `10.8.x.x/16`
+- `10.0.x.x/16`
+
+**IPv6 reverse DNS is not auto-generated.** Use manual PTR records in a dedicated zone instead:
+
+```yaml
+- zone: "8.b.d.0.1.0.0.2.ip6.arpa"
+  type: "static"
+  records:
+    - name: "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa"
+      type: "PTR"
+      value: "server1.internal.example.com"
+```