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+// This is an example configuration file for the DHCPv6 server in Kea.
+// The purpose of this example is to showcase how clients can be classified.
+
+{ "Dhcp6":
+
+{
+// Kea is told to listen on eth0 interface only.
+  "interfaces-config": {
+    "interfaces": [ "eth0" ]
+  },
+
+// Let's use the simplest backend: memfile and use some reasonable values
+// for timers. They are of no concern for the classification demonstration.
+  "lease-database": {
+      "type": "memfile",
+      "lfc-interval": 3600
+  },
+  "renew-timer": 1000,
+  "rebind-timer": 2000,
+  "preferred-lifetime": 3000,
+  "valid-lifetime": 4000,
+
+// This list defines several classes that incoming packets can be assigned to.
+// One packet can belong to zero or more classes.
+  "client-classes": [
+
+// This class is required by the second subnet and is evaluated only
+// if it is required. The test expression returns true.
+// Note it is not possible to depend on cable-modems class because it
+// is not yet defined.
+  {
+      "name": "second_subnet",
+      "only-if-required": true,
+      "test": "member('ALL')",
+      "option-data": [{
+          "name": "dns-servers",
+          "data": "2001:db8::1"
+      }]
+  },
+
+// Let's classify all incoming RENEW (message type 5) to a separate
+// class.
+  {
+      "name": "renews",
+      "test": "pkt6.msgtype == 5"
+  },
+
+// Let's pick cable modems. In this simple example we'll assume the device
+// is a cable modem if it sends a vendor option with enterprise-id equal
+// to 4491.
+  {
+      "name": "cable-modems",
+      "test": "vendor.enterprise == 4491"
+  },
+
+// Both a cable modem (by evaluation or host reservation) and has a host
+// reservation.
+  {
+      "name": "cable-modem-hosts",
+      "test": "member('cable-modems') and member('KNOWN')"
+  }
+
+  ],
+
+
+// The following list defines subnets. Each subnet consists of at
+// least subnet and pool entries.
+  "subnet6": [
+    {
+        "pools": [ { "pool": "2001:db8:1::/80" } ],
+        "subnet": "2001:db8:1::/64",
+        "client-class": "cable-modems",
+        "interface": "eth0"
+    },
+// The following subnet contains a class reservation for a client using
+// DUID 01:02:03:04:05:0A:0B:0C:0D:0E. This client will always be assigned
+// to this class.
+    {
+        "pools": [ { "pool": "2001:db8:2::/80" } ],
+        "subnet": "2001:db8:2::/64",
+        "reservations": [
+        {
+            "duid": "01:02:03:04:05:0A:0B:0C:0D:0E",
+            "client-classes": [ "cable-modems" ]
+        } ],
+        "interface": "eth0",
+        "require-client-classes": [ "second_subnet" ]
+    },
+// The following subnet contains a pool with a class constraint: only
+// clients which belong to the class are allowed to use this pool.
+    {
+        "pools": [
+           {
+               "pool": "2001:db8:4::/80",
+               "client-class": "cable-modems"
+           } ],
+         "subnet": "2001:db8:4::/64",
+         "interface": "eth1"
+    },
+// This subnet is divided in two pools for unknown and known
+// (i.e. which have a reservation) clients. The built-in KNOWN and
+// UNKNOWN classes are set or not at host reservation lookup (KNOWN if
+// this returns something, UNKNOWN if this finds nothing) and client
+// classes depending on it are evaluated.
+// This happens after subnet selection and before address allocation
+// from pools.
+    {
+        "pools": [
+            {
+               "pool": "2001:db8:8::/64",
+               "client-class": "UNKNOWN"
+            },
+            {
+               "pool": "2001:db8:9::/64",
+               "client-class": "KNOWN"
+           }
+        ],
+        "subnet": "2001:db8:8::/46",
+        "reservations": [
+            {  "hw-address": "00:00:00:11:22:33", "hostname": "h1" },
+            {  "hw-address": "00:00:00:44:55:66", "hostname": "h4" },
+            {  "hw-address": "00:00:00:77:88:99", "hostname": "h7" },
+            {  "hw-address": "00:00:00:aa:bb:cc", "hostname": "ha" }
+        ]
+    }
+
+  ],
+
+// The following configures logging. It assumes that messages with at
+// least informational level (info, warn, error and fatal) should be
+// logged to stdout.
+    "loggers": [
+        {
+            "name": "kea-dhcp6",
+            "output_options": [
+                {
+                    "output": "stdout"
+                }
+            ],
+            "debuglevel": 0,
+            "severity": "INFO"
+        }
+    ]
+}
+
+}