kea/doc/examples/kea4/reservations.json

# This is an example configuration file for the DHCPv4 server in Kea.
# It contains one subnet in which there are two static address reservations
# for the clients identified by the MAC addresses.
{ "Dhcp4":

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

# We need to specify lease type. As of May 2014, three backends are supported:
# memfile, mysql and pgsql. We'll just use memfile, because it doesn't require
# any prior set up.
  "lease-database": {
    "type": "memfile"
  },

# Addresses will be assigned with valid lifetimes being 4000. 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).
  "valid-lifetime": 4000,

# Renew and rebind timers are commented out. This implies that options
# 58 and 59 will not be sent to the client. In this case it is up to
# the client to pick the timer values according to RFC2131. Uncomment the
# timers to send these options to the client.
#  "renew-timer": 1000,
#  "rebind-timer": 2000,


# Kea supports reservations by several different types of identifiers:
# hw-address (hardware/MAC address of the client), duid (DUID inserted by the
# client), client-id (client identifier inserted by the client) and circuit-id
# (circuit identifier inserted by the relay agent). When told to do so, Kea can
# check for all of those identifier types, but it takes a costly database lookup
# to do so. It is therefore useful from a performance perspective to use only
# the reservation types that are actually used in a given network.

# The example below is not optimal from a performance perspective, but it
# nicely showcases the host reservation capabilities. Please use the minimum
# set of identifier types used in your network.
"host-reservation-identifiers": [ "circuit-id", "hw-address", "duid", "client-id" ],

# Define a subnet with four reservations. Some of the reservations belong
# to the dynamic pool. Kea is able to handle this case, but it is not
# recommended from a performance perspective, as Kea would not only need to
# check if a given address is free, but also whether it is reserved.
# To avoid this check, one can change reservation-mode to out-of-pool, rather
# than 'all'. If a subnet does not have reservations at all, the reservation
# lookup can be skipped altogether (reservation-mode is set to 'disabled').

# Note that the second reservation is for an address which is within the
# range of the pool of the dynamically allocated address. The server will
# exclude this address from this pool and only assign it to the client which
# has a reservation for it.
  "subnet4": [
    {
       "pools": [ { "pool":  "192.0.2.1 - 192.0.2.200" } ],
       "subnet": "192.0.2.0/24",
       "interface": "eth0",
        "reservations": [

# This is a reservation for a specific hardware/MAC address. It's a very
# simple reservation: just an address and nothing else.
         {
             "hw-address": "1a:1b:1c:1d:1e:1f",
             "ip-address": "192.0.2.202"
         },

# This is a reservation for a specific client-id. It also shows
# the this client will get a reserved hostname. A hostname can be defined
# for any identifier type, not just client-id.
         {
             "client-id": "01:11:22:33:44:55:66",
             "ip-address": "192.0.2.100",
             "hostname": "special-snowflake"
         },

# The third reservation is based on DUID. This reservation also
# defines special option values for this particular client. If
# the domain-name-servers option would have been defined on a global,
# subnet or class level, the host specific values take preference.
         {
             "duid": "01:02:03:04:05",
             "ip-address": "192.0.2.203",
             "option-data": [ {
                 "name": "domain-name-servers",
                 "data": "10.1.1.202,10.1.1.203"
             } ]
         },

# The fourth reservation is based on circuit-id. This is an option inserted
# by the relay agent that forwards the packet from client to the server.
# In this example the host is also assigned vendor specific options.
         {
             "client-id": "01:11:22:33:44:55:66",
             "ip-address": "192.0.2.204",
             "option-data": [
                 {
                     "name": "vivso-suboptions",
                     "data": "4491"
                 },
                 {
                     "name": "tftp-servers",
                     "space": "vendor-4491",
                     "data": "10.1.1.202,10.1.1.203"
                 }
             ]
         }
       ]
    }
  ]
},

# The following configures logging. It assumes that messages with at least
# informational level (info, warn, error) will will be logged to stdout.
"Logging": {
    "loggers": [
        {
            "name": "kea-dhcp4",
            "output_options": [
                {
                    "output": "stdout"
                }
            ],
            "severity": "INFO"
        }
    ]
}

}