// This is an example configuration file for DHCPv6 server in Kea.
// It provides parameters controlling processing of expired leases,
// a.k.a. leases reclamation.

{ "Dhcp6":

{
// Kea is told to listen on eth0 interface only.
  "interfaces-config": {
    "interfaces": [ "eth0" ]
  },

// We need to specify the database used to store leases. As of
// June 2022, three database backends are supported: MySQL,
// PostgreSQL and the in-memory database, Memfile.
// We'll use memfile because it doesn't require any prior set up.
// Note, we're setting the maximum number of row read errors to 100,
// (defaults to 0, meaning unlimited).
  "lease-database": {
      "type": "memfile",
      "lfc-interval": 3600,
      "max-row-errors": 100
  },

// The following parameters control processing expired leases. Expired leases
// will be reclaimed periodically according to the "reclaim-timer-wait-time"
// parameter. Reclaimed leases will be held in the database for 1800s to
// facilitate lease affinity. After this period the leases will be removed.
// The frequency of removal is controlled by the
// "flush-reclaimed-timer-wait-time" parameter. The lease reclamation
// routine will process at most 500 leases or will last for at most
// 100ms, during a single run. If there are still some unreclaimed
// leases after 10 attempts, a warning message is issued.
// If both "flush-reclaimed-timer-wait-time" and "hold-reclaimed-time" are not
// 0, when the client sends a release message the lease is expired instead of
// being deleted from lease storage.
  "expired-leases-processing": {
    "reclaim-timer-wait-time": 5,
    "hold-reclaimed-time": 1800,
    "flush-reclaimed-timer-wait-time": 10,
    "max-reclaim-leases": 500,
    "max-reclaim-time": 100,
    "unwarned-reclaim-cycles": 10
  },

// Addresses will be assigned with preferred and valid lifetimes
// being 3000 and 4000, respectively. Client is told to start
// renewing after 1000 seconds. If the server does not respond
// after 2000 seconds since the lease was granted, client is supposed
// to start REBIND procedure (emergency renewal that allows switching
// to a different server).
  "preferred-lifetime": 3000,
  "valid-lifetime": 4000,
  "renew-timer": 1000,
  "rebind-timer": 2000,

// The following list defines subnets. Each subnet consists of at
// least subnet and pool entries.
  "subnet6": [
    {
      "id": 1,
      "pools": [ { "pool": "2001:db8:1::/80" } ],
      "subnet": "2001:db8:1::/64",
      "interface": "eth0"
    }
  ],

// 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"
        }
    ]
}

}