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+// This is a basic configuration for the Kea DHCPv6 server. Subnet declarations
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+// are mostly commented out and no interfaces are listed. Therefore, the servers
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+// will not listen or respond to any queries.
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+// The basic configuration must be extended to specify interfaces on which
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+// the servers should listen. There are a number of example options defined.
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+// These probably don't make any sense in your network. Make sure you at least
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+// update the following, before running this example in your network:
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+// - change the network interface names
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+// - change the subnets to match your actual network
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+// - change the option values to match your network
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+//
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+// This is just a very basic configuration. Kea comes with large suite (over 30)
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+// of configuration examples and extensive Kea User's Guide. Please refer to
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+// those materials to get better understanding of what this software is able to
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+// do. Comments in this configuration file sometimes refer to sections for more
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+// details. These are section numbers in Kea User's Guide. The version matching
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+// your software should come with your Kea package, but it is also available
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+// on Kea web page (http://kea.isc.org, click User's Guide, direct link for
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+// stable version is http://kea.isc.org/docs/kea-guide.html).
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+{
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+
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+// DHCPv6 configuration starts here. This section will be read by DHCPv6 server
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+// and will be ignored by other components.
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+"Dhcp6": {
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+ // Add names of your network interfaces to listen on.
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+ "interfaces-config": {
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+ // You typically want to put specific interface names here, e.g. eth0
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+ // but you can also specify unicast addresses (e.g. eth0/2001:db8::1) if
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+ // you want your server to handle unicast traffic in addition to
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+ // multicast. (DHCPv6 is a multicast based protocol).
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+ "interfaces": [ ]
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+ },
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+
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+ // Kea support control channel, which is a way to receive management commands
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+ // while the server is running. This is a Unix domain socket that receives
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+ // commands formatted in JSON, e.g. config-set (which sets new configuration),
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+ // config-reload (which tells Kea to reload its configuration from file),
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+ // statistic-get (to retrieve statistics) and many more. For detailed
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+ // description, see Sections 9.12, 16 and 15.
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+ "control-socket": {
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+ "socket-type": "unix",
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+ "socket-name": "/tmp/kea-dhcp6-ctrl.sock"
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+ },
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+
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+ // Use Memfile lease database backend to store leases in a CSV file.
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+ // Depending on how Kea was compiled, it may also support SQL databases
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+ // (MySQL and/or PostgreSQL) and even Cassandra. Those database backends
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+ // require more parameters, like name, host and possibly user and password.
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+ // There are dedicated examples for each backend. See Section 8.2.2 "Lease
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+ // Storage" for details.
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+ "lease-database": {
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+ "type": "memfile"
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+ },
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+
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+ // Kea allows storing host reservations in a database. If your network is
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+ // small or you have few reservations, it's probably easier to keep them
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+ // in the configuration file. If your network is large, it's usually better
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+ // to use database for it. To enable it, uncomment the following:
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+ // "hosts-database": {
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+ // "type": "mysql",
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+ // "name": "kea",
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+ // "user": "kea",
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+ // "password": "kea",
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+ // "host": "localhost",
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+ // "port": 3306
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+ // },
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+ // See Section 8.2.3 "Hosts storage" for details.
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+
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+ // Setup reclamation of the expired leases and leases affinity.
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+ // Expired leases will be reclaimed every 10 seconds. Every 25
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+ // seconds reclaimed leases, which have expired more than 3600
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+ // seconds ago, will be removed. The limits for leases reclamation
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+ // are 100 leases or 250 ms for a single cycle. A warning message
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+ // will be logged if there are still expired leases in the
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+ // database after 5 consecutive reclamation cycles.
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+ "expired-leases-processing": {
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+ "reclaim-timer-wait-time": 10,
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+ "flush-reclaimed-timer-wait-time": 25,
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+ "hold-reclaimed-time": 3600,
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+ "max-reclaim-leases": 100,
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+ "max-reclaim-time": 250,
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+ "unwarned-reclaim-cycles": 5
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+ },
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+
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+ // These parameters govern global timers. Addresses will be assigned with
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+ // preferred and valid lifetimes being 3000 and 4000, respectively. Client
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+ // is told to start renewing after 1000 seconds. If the server does not
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+ // respond after 2000 seconds since the lease was granted, a client is
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+ // supposed to start REBIND procedure (emergency renewal that allows
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+ // switching to a different server).
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+ "renew-timer": 1000,
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+ "rebind-timer": 2000,
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+ "preferred-lifetime": 3000,
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+ "valid-lifetime": 4000,
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+
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+ // These are global options. They are going to be sent when a client requests
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+ // them, unless overwritten with values in more specific scopes. The scope
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+ // hierarchy is:
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+ // - global
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+ // - subnet
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+ // - class
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+ // - host
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+ //
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+ // Not all of those options make sense. Please configure only those that
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+ // are actually useful in your network.
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+ //
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+ // For a complete list of options currently supported by Kea, see
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+ // Section 8.2.9 "Standard DHCPv6 Options". Kea also supports
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+ // vendor options (see Section 7.2.10) and allows users to define their
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+ // own custom options (see Section 7.2.9).
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+ "option-data": [
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+ // When specifying options, you typically need to specify
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+ // one of (name or code) and data. The full option specification
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+ // covers name, code, space, csv-format and data.
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+ // space defaults to "dhcp6" which is usually correct, unless you
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+ // use encapsulate options. csv-format defaults to "true", so
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+ // this is also correct, unless you want to specify the whole
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+ // option value as long hex string. For example, to specify
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+ // domain-name-servers you could do this:
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+ // {
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+ // "name": "dns-servers",
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+ // "code": 23,
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+ // "csv-format": "true",
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+ // "space": "dhcp6",
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+ // "data": "2001:db8:2::45, 2001:db8:2::100"
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+ // }
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+ // but it's a lot of writing, so it's easier to do this instead:
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+ {
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+ "name": "dns-servers",
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+ "data": "2001:db8:2::45, 2001:db8:2::100"
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+ },
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+
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+ // Typically people prefer to refer to options by their names, so they
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+ // don't need to remember the code names. However, some people like
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+ // to use numerical values. For example, DHCPv6 can optionally use
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+ // server unicast communication, if extra option is present. Option
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+ // "unicast" uses option code 12, so you can reference to it either
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+ // by "name": "unicast" or "code": 12. If you enable this option,
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+ // you really should also tell the server to listen on that address
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+ // (see interfaces-config/interfaces list above).
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+ {
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+ "code": 12,
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+ "data": "2001:db8::1"
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+ },
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+
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+ // String options that have a comma in their values need to have
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+ // it escaped (i.e. each comma is preceded by two backslashes).
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+ // That's because commas are reserved for separating fields in
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+ // compound options. At the same time, we need to be conformant
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+ // with JSON spec, that does not allow "\,". Therefore the
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+ // slightly uncommon double backslashes notation is needed.
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+
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+ // Legal JSON escapes are \ followed by "\/bfnrt character
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+ // or \u followed by 4 hexadecimal numbers (currently Kea
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+ // supports only \u0000 to \u00ff code points).
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+ // CSV processing translates '\\' into '\' and '\,' into ','
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+ // only so for instance '\x' is translated into '\x'. But
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+ // as it works on a JSON string value each of these '\'
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+ // characters must be doubled on JSON input.
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+ {
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+ "name": "new-posix-timezone",
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+ "data": "EST5EDT4\\,M3.2.0/02:00\\,M11.1.0/02:00"
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+ },
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+
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+ // Options that take integer values can either be specified in
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+ // dec or hex format. Hex format could be either plain (e.g. abcd)
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+ // or prefixed with 0x (e.g. 0xabcd).
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+ {
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+ "name": "preference",
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+ "data": "0xf0"
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+ },
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+
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+ // A few options are encoded in (length, string) tuples
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+ // which can be defined using only strings as the CSV
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+ // processing computes lengths.
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+ {
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+ "name": "bootfile-param",
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+ "data": "root=/dev/sda2, quiet, splash"
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+ }
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+ ],
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+
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+ // Below an example of a simple IPv6 subnet declaration. Uncomment to enable
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+ // it. This is a list, denoted with [ ], of structures, each denoted with
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+ // { }. Each structure describes a single subnet and may have several
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+ // parameters. One of those parameters is "pools" that is also a list of
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+ // structures.
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+ "subnet6": [
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+ {
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+ // This defines the whole subnet. Kea will use this information to
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+ // determine where the clients are connected. This is the whole
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+ // subnet in your network. This is mandatory parameter for each
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+ // subnet.
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+ "subnet": "2001:db8:1::/64",
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+
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+ // Pools define the actual part of your subnet that is governed
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+ // by Kea. Technically this is optional parameter, but it's
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+ // almost always needed for DHCP to do its job. If you omit it,
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+ // clients won't be able to get addresses, unless there are
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+ // host reservations defined for them.
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+ "pools": [ { "pool": "2001:db8:1::/80" } ],
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+
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+ // Kea supports prefix delegation (PD). This mechanism delegates
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+ // whole prefixes, instead of single addresses. You need to specify
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+ // a prefix and then size of the delegated prefixes that it will
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+ // be split into. This example below tells Kea to use
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+ // 2001:db8:1::/56 prefix as pool and split it into /64 prefixes.
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+ // This will give you 256 (2^(64-56)) prefixes.
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+ "pd-pools": [
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+ {
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+ "prefix": "2001:db8:8::",
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+ "prefix-len": 56,
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+ "delegated-len": 64
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+
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+ // Kea also supports excluded prefixes. This advanced option
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+ // is explained in Section 9.2.9. Please make sure your
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+ // excluded prefix matches the pool it is defined in.
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+ // "excluded-prefix": "2001:db8:8:0:80::",
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+ // "excluded-prefix-len": 72
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+ }
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+ ],
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+ "option-data": [
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+ // You can specify additional options here that are subnet
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+ // specific. Also, you can override global options here.
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+ {
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+ "name": "dns-servers",
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+ "data": "2001:db8:2::dead:beef, 2001:db8:2::cafe:babe"
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+ }
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+ ],
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+
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+ // Host reservations can be defined for each subnet.
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+ //
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+ // Note that reservations are subnet-specific in Kea. This is
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+ // different than ISC DHCP. Keep that in mind when migrating
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+ // your configurations.
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+ "reservations": [
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+ // This is a simple host reservation. The host with DUID matching
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+ // the specified value will get an address of 2001:db8:1::100.
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+ {
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+ "duid": "01:02:03:04:05:0A:0B:0C:0D:0E",
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+ "ip-addresses": [ "2001:db8:1::100" ]
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+ },
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+
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+ // This is similar to the previous one, but this time the
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+ // reservation is done based on hardware/MAC address. The server
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+ // will do its best to extract the hardware/MAC address from
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+ // received packets (see 'mac-sources' directive for
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+ // details). This particular reservation also specifies two
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+ // extra options to be available for this client. If there are
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+ // options with the same code specified in a global, subnet or
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+ // class scope, the values defined at host level take
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+ // precedence.
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+ {
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+ "hw-address": "00:01:02:03:04:05",
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+ "ip-addresses": [ "2001:db8:1::101" ],
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+ "option-data": [
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+ {
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+ "name": "dns-servers",
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+ "data": "3000:1::234"
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+ },
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+ {
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+ "name": "nis-servers",
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+ "data": "3000:1::234"
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+ }],
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+
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+ // This client will be automatically added to certain
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+ // classes.
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+ "client-classes": [ "special_snowflake", "office" ]
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+ },
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+
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+ // This is a bit more advanced reservation. The client with the
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+ // specified DUID will get a reserved address, a reserved prefix
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+ // and a hostname. This reservation is for an address that it
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+ // not within the dynamic pool. Finally, this reservation
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+ // features vendor specific options for CableLabs, which happen
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+ // to use enterprise-id 4491. Those particular values will be
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+ // returned only to the client that has a DUID matching this
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+ // reservation.
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+ {
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+ "duid": "01:02:03:04:05:06:07:08:09:0A",
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+ "ip-addresses": [ "2001:db8:1:cafe::1" ],
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+ "prefixes": [ "2001:db8:2:abcd::/64" ],
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+ "hostname": "foo.example.com",
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+ "option-data": [
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+ {
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+ "name": "vendor-opts",
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+ "data": "4491"
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+ },
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+ {
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+ "name": "tftp-servers",
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+ "space": "vendor-4491",
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+ "data": "3000:1::234"
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+ }
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+ ]
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+ },
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+
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+ // This reservation is using flexible identifier. Instead of
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+ // relying on specific field, sysadmin can define an expression
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+ // similar to what is used for client classification,
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+ // e.g. substring(relay[0].option[17],0,6). Then, based on the
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+ // value of that expression for incoming packet, the reservation
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+ // is matched. Expression can be specified either as hex or
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+ // plain text using single quotes.
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+
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+ // Note: flexible identifier requires flex_id hook library to be
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+ // loaded to work.
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+ {
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+ "flex-id": "'somevalue'",
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+ "ip-addresses": [ "2001:db8:1:cafe::2" ]
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+ }
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+ ]
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+ }
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+ // More subnets can be defined here.
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+ // {
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+ // "subnet": "2001:db8:2::/64",
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+ // "pools": [ { "pool": "2001:db8:2::/80" } ]
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+ // },
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+ // {
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+ // "subnet": "2001:db8:3::/64",
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+ // "pools": [ { "pool": "2001:db8:3::/80" } ]
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+ // },
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+ // {
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+ // "subnet": "2001:db8:4::/64",
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+ // "pools": [ { "pool": "2001:db8:4::/80" } ]
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+ // }
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+ ]
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+
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+ // Client-classes can be defined here. See "client-classes" in Dhcp4 for
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+ // an example.
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+
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+ // Hook libraries can be defined here. See "hooks-libraries" example in
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+ // Dhcp4.
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+
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+ // DDNS information (how the DHCPv6 component can reach a DDNS daemon)
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+
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+},
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+
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+// Logging configuration starts here. Kea uses different loggers to log various
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+// activities. For details (e.g. names of loggers), see Chapter 18.
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+"Logging":
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+{
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+ "loggers": [
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+ {
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+ // This section affects kea-dhcp4, which is the base logger for DHCPv4
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+ // component. It tells DHCPv4 server to write all log messages (on
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+ // severity INFO or more) to a file.
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+ "name": "kea-dhcp4",
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+ "output_options": [
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+ {
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+ // Specifies the output file. There are several special values
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+ // supported:
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+ // - stdout (prints on standard output)
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+ // - stderr (prints on standard error)
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+ // - syslog (logs to syslog)
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+ // - syslog:name (logs to syslog using specified name)
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+ // Any other value is considered a name of a time
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+ "output": "@localstatedir@/log/kea-dhcp4.log"
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+
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+ // This governs whether the log output is flushed to disk after
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+ // every write.
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+ // "flush": false,
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+
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+ // This specifies the maximum size of the file before it is
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+ // rotated.
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+ // "maxsize": 1048576,
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+
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+ // This specifies the maximum number of rotated files to keep.
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+ // "maxver": 8
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+ }
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+ ],
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+ // This specifies the severity of log messages to keep. Supported values
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+ // are: FATAL, ERROR, WARN, INFO, DEBUG
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+ "severity": "INFO",
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+
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+ // If DEBUG level is specified, this value is used. 0 is least verbose,
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+ // 99 is most verbose. Be cautious, Kea can generate lots and lots
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+ // of logs if told to do so.
|
|
|
+ "debuglevel": 0
|
|
|
+ },
|
|
|
+ {
|
|
|
+ // This specifies the logging for kea-dhcp6 logger, i.e. all logs
|
|
|
+ // generated by Kea DHCPv6 server.
|
|
|
+ "name": "kea-dhcp6",
|
|
|
+ "output_options": [
|
|
|
+ {
|
|
|
+ "output": "@localstatedir@/log/kea-dhcp6.log"
|
|
|
+ }
|
|
|
+ ],
|
|
|
+ "severity": "INFO",
|
|
|
+ "debuglevel": 0
|
|
|
+ },
|
|
|
+ {
|
|
|
+ // This specifies the logging for D2 (DHCP-DDNS) daemon.
|
|
|
+ "name": "kea-dhcp-ddns",
|
|
|
+ "output_options": [
|
|
|
+ {
|
|
|
+ "output": "@localstatedir@/log/kea-ddns.log"
|
|
|
+ }
|
|
|
+ ],
|
|
|
+ "severity": "INFO",
|
|
|
+ "debuglevel": 0
|
|
|
+ },
|
|
|
+ {
|
|
|
+ "name": "kea-ctrl-agent",
|
|
|
+ "output_options": [
|
|
|
+ {
|
|
|
+ "output": "@localstatedir@/log/kea-ctrl-agent.log"
|
|
|
+ }
|
|
|
+ ],
|
|
|
+ "severity": "INFO",
|
|
|
+ "debuglevel": 0
|
|
|
+ }
|
|
|
+ ]
|
|
|
+}
|
|
|
+}
|
Marcin Siodelski