Dies ist eine alte Version des Dokuments!
DHCPv4|v6-Server mit DHCP ISC Kea unter Arch Linux einrichten und nutzen
under construction - an dem Artikel wird gerade gefeilt … coming soon!
Zum Einsatz in unserer Umgebung wird der Kea DHCP-Server kommen, der Nachfolger des ISC DHCP Servers der Ende 2022 das Ende seines Lebenszyklus erreichte und nicht weiterentwickelt wurde. Das Nachfolgeprodukt ist nun der moderne Open Source DHCPv4 & DHCPv6 Server Kea.
Im wesentlichen unterscheidet sich Kea von seinem Vorgänger unter anderem durch sein modulares Komponentenbasierenden Design, welches mit sog. Hooks-Modulen leicht erweiterbar ist. Kea stellt einzelne Daemons zur Verfügung die entweder gemeinsam oder auch getrennt genutzt werden können. So enthält Kea einen Daemon für einen DHCPv4-Server, einen DHCPv6-Server und ein dynamisches Modul für DNS. Die Konfiguration des Kea-Servers erfolgt mit Hilfe einer JSON-Konfigurationsdatei. Mit Hilfe der REST-API können zur Laufzeit jederzeit während des Betriebs Änderungen des Daemons vorgenommen werden, ohne dass der Daemon neu gestartet werden muss. Optional kann beim Kea Server auch ein WEB-UI ein grafisches Dashboard genutzt werden zur Überwachung mehrerer Kea-Instanzen. Neben der Dateibasierenden Variante können die ganzen Konfigurationsoptionen auch optional in einer PostgreSQL oder Maria-mySQL-Datenbank vorgehalten werden.
In der nachfolgenden WIKI-Artikel wollen wir uns nun eingehender mit der Installation und Konfiguration unseres Kea DHCP Servers für für DHCPv4 und DHCPv6 beschäftigen. In dem Konfigurationsbeispiel wird dem Kea-Daemon die Verwaltung und Verteilung der Intranet-Adressen der Zone intra.nausch.org
übertragen. Dieses Subnetz umfasst nachfolgende Adressbereiche - zum besseren Verständnis sind in der Tabelle auch exemplarische zwei Hosts mit den entsprechenden Adressen vermerkt:
Subnetz (ID) | Subnetz (Use) | Subnetz Addresse - | Host Address-Range (global Unicast) | Host - | IPv4 - | Link-Local-Scope - | Site-Local-Scope - | Global-Scope - |
---|---|---|---|---|---|---|---|---|
7 | Intra | 2003:a:e0d:7607::/64 | 2003:a:e0d:7607:: | |||||
pml010102 | 10.0.10.102 | fd00::7:10:0:10:102 | fe80::7:10:ff:fe10:102 | 2003:a:e0d:7607:10:0:10:102 |
||||
vml010110 | 10.0.10.110 | fd00::7:10:0:10:110 | fe80::7:10:ff:fe10:110 | 2003:a:e0d:7607:10:0:10:110 |
Grundsätzliches
DHCPv4-Adressvergabe
Der grundsätzliche Ablauf bei der Adress-Anfrage folgt dabei folgendem Schema. Die Kommunikation zwischen dem Server (Port 67) und dem Klienten (Port 68) erfolgte mittels UPD1).
Beim Booten des Klienten frägt dieser mit einer DHCPDISCOVER-Nachricht via Broadcast nach seiner Konfiguration. Zu diesem Zeitpunkt besitzt er noch keine eigene IP-Adresse und er kennt auch noch nicht, in welchem Netz er sich befindet. Lediglich seine MAC2)-Adresse seines Netzwerkinterfaces ist ihm bekannt. Aus diesem Grund sendet er ein Broadcastpaket mit der Quelladresse 0.0.0.0 und an die Zieladresse 255.255.255.255.
Sep 12 21:34:12 nss dhcpd: DHCPDISCOVER from 00:04:13:23:3f:b5 via eth0
Dieses Broadcast-Paket beantwortet nun der DHCP-Server mit einer DHCPOFFER-Nachricht. Das Antwortpaket beinhaltet bereits als Zieladresse die IP, welche der Klient in Zukunft bekommen soll. Da bei der vorherigen Anfrage des Klienten, dieser seine eigene MAC-Adresse mitschickte, kann nun auf diese Weise die DHCPOFFER-Nachricht ihr Ziel finden.
Sep 12 21:34:12 nss dhcpd: DHCPOFFER on 192.168.10.61 to 00:04:13:23:3f:b5 via eth0
Der Klient hat also vom DHCP-Server ein sogenanntes Angebot (offer) bekommen und entscheidet nun, ob es für ihn so in Ordnung ist. Trifft dies zu, sendet er eine DHCPREQUEST-Nachricht, an den DHCP-Server um diesen mitzuteilen, daß er diese Konfiguration nutzen will.
Sep 12 21:34:12 nss dhcpd: DHCPREQUEST for 192.168.10.61 (192.168.10.1) from 00:04:13:23:3f:b5 via eth0
Der DHCP-Server bestätigt dies und sendet eine DHCPACK-Nachricht, somit besitzt der Klient nun seine eigene IP-Adresse und kennt ggf. noch weitere Parameter für seine weitere Netzwerkkommunkation.
Sep 12 21:34:12 nss dhcpd: DHCPACK on 192.168.10.61 to 00:04:13:23:3f:b5 via eth0
Der gesamte erfolgreiche Ablauf aus Sicht des DHCP-Servers entspricht folgendem Diagramm.
Im syslog des DHCP-Servers wird der Ablauf wie folgt festgehalten:
Sep 12 21:34:12 nss dhcpd: DHCPDISCOVER from 00:04:13:23:3f:b5 via eth0 Sep 12 21:34:12 nss dhcpd: DHCPOFFER on 192.168.10.61 to 00:04:13:23:3f:b5 via eth0 Sep 12 21:34:12 nss dhcpd: DHCPREQUEST for 192.168.10.61 (192.168.10.1) from 00:04:13:23:3f:b5 via eth0 Sep 12 21:34:12 nss dhcpd: DHCPACK on 192.168.10.61 to 00:04:13:23:3f:b5 via eth0
Sollte die ganze Prozedur Fehl schlagen, z.B. weil der Klient herausgefunden hat, daß die IP-Adresse doppelt vergeben ist, sendet er eine DHCPDECLINE-Nachricht an der Server. Im Falle einer DHCPDECLINE-Nachricht, sperrt der Server die Adresse für die interne Vergabe und die gesamte Vergabeprozedur beginnt erneut von vorne.
Zusammen mit seiner IP-Adresse erhält der Klient in der DHCPACK-Nachricht auch eine Lease-Time mitgeteilt, welche ihm mitteilt, wie lange die IP-Adresse für ihn reserviert ist. Im RFC Standard wurde definiert, daß der Klient nach der Hälfte der Lease-Time einen erneuten DHCPREQUEST sendet. So teilt er dem Server mit, daß er weiterhin die für ihn reservierte IP-Adresse behalten möchte. Nach Erhalt dieser Nachricht sendet der DHCP-Server eine identische DHCPACK-Nachricht an den Client zurück, in der dann die aktuelle neue Lease-Time mitgeteilt wird. Die IP-Adresse ist somit verlängert und der DCHP-Refresh ist komplett. Sollte der Klient es versäumen eine Verlängerung zu beantragen, muss er die Konfiguration des Netzwerkinterfaces verwerfen und der DHCP-Request startet erneut mit einer DHCPDISCOVER-Nachricht.
Beim Herunterfahren eines Klienten kann dieser dem Server mit einer DHCPRELEASE-Nachricht den Server informieren, damit dieser die Adresse wieder freigeben kann.
Sep 12 21:58:17 nss dhcpd: DHCPRELEASE of 192.168.10.238 from 00:17:a4:7d:26:1a (hpc6180) via eth0 (found)
Der Klient hat aber auch die Möglichkeit, seine zuletzt zugewiesene IP-Adresse über den Reboot hinweg zu „merken“. Dies kann z.B. dann der Fall sein, wenn die Lease-Time, noch nicht abgelaufen ist, oder dem Klienten eine feste IP-Adresse zugeteilt wurde. Dann entfallen die Initialisierungsschritte und der Klient schickt direkt eine DHCPREQUEST-Nachricht an den DHCP-Server. Dieser bestätigt entweder die Anfrage oder sendet eine DHCPNAK-Nachricht um dem Klienten mitzuteilen, daß dieser seine gespeicherten Konfigurationen zu löschen, und die Anfrage komplett von vorne zu beginnen hat.
Sep 12 22:01:13 nss dhcpd: DHCPREQUEST for 192.168.10.15 from 00:17:a4:7d:26:1a via eth0 Sep 12 22:01:13 nss dhcpd: DHCPACK on 192.168.10.15 to 00:17:a4:7d:26:1a via eth0
DHCPv6-Adressvergabe
t.b.d.
Installation
Die Installation und Konfiguration des DHCP-Servers gestaltet sich relativ einfach. Bei der Installation des Kea-Paketes verwenden wir unter Arch Linux den Paketmanager pacman
.
- Als User:
$ sudo pacman -S kea
- Als Nutzer mit Root-Rechten entsprechend:
# pacman -S kea
Paketinhalt
Was uns das Paket kea alles in das System unseres Arch Linux Server gebracht hat, können wir wie folgt abfragen:
# pacman -Qil kea
Name : kea Version : 2.4.1-1 Description : High-performance, extensible DHCP server engine from ISC, supporting both DHCPv4 and DHCPv6 Architecture : x86_64 URL : https://kea.isc.org Licenses : MPL2 Groups : None Provides : None Depends On : log4cplus mariadb-libs openssl postgresql-libs Optional Deps : mariadb: lease information database postgresql: lease information database python: to use kea-shell [installed] krb5: Kerberos support [installed] kea-docs: user and developer documentation Required By : None Optional For : None Conflicts With : None Replaces : None Installed Size : 22.61 MiB Packager : Robin Candau <antiz@archlinux.org> Build Date : Tue 28 Nov 2023 05:52:25 PM CET Install Date : Sat 02 Mar 2024 08:35:27 PM CET Install Reason : Explicitly installed Install Script : No Validated By : Signature kea /etc/ kea /etc/kea/ kea /etc/kea/kea-ctrl-agent.conf kea /etc/kea/kea-dhcp-ddns.conf kea /etc/kea/kea-dhcp4.conf kea /etc/kea/kea-dhcp6.conf kea /etc/kea/keactrl.conf kea /usr/ kea /usr/bin/ kea /usr/bin/kea-admin kea /usr/bin/kea-ctrl-agent kea /usr/bin/kea-dhcp-ddns kea /usr/bin/kea-dhcp4 kea /usr/bin/kea-dhcp6 kea /usr/bin/kea-lfc kea /usr/bin/kea-msg-compiler kea /usr/bin/kea-shell kea /usr/bin/keactrl kea /usr/bin/perfdhcp kea /usr/include/ kea /usr/include/kea/ kea /usr/include/kea/asiodns/ kea /usr/include/kea/asiodns/asiodns_messages.h kea /usr/include/kea/asiodns/io_fetch.h kea /usr/include/kea/asiodns/logger.h kea /usr/include/kea/asiolink/ kea /usr/include/kea/asiolink/addr_utilities.h kea /usr/include/kea/asiolink/asio_wrapper.h kea /usr/include/kea/asiolink/asiolink.h kea /usr/include/kea/asiolink/botan_boost_tls.h kea /usr/include/kea/asiolink/botan_boost_wrapper.h kea /usr/include/kea/asiolink/botan_tls.h kea /usr/include/kea/asiolink/common_tls.h kea /usr/include/kea/asiolink/crypto_tls.h kea /usr/include/kea/asiolink/dummy_io_cb.h kea /usr/include/kea/asiolink/interval_timer.h kea /usr/include/kea/asiolink/io_acceptor.h kea /usr/include/kea/asiolink/io_address.h kea /usr/include/kea/asiolink/io_asio_socket.h kea /usr/include/kea/asiolink/io_endpoint.h kea /usr/include/kea/asiolink/io_error.h kea /usr/include/kea/asiolink/io_service.h kea /usr/include/kea/asiolink/io_service_signal.h kea /usr/include/kea/asiolink/io_service_thread_pool.h kea /usr/include/kea/asiolink/io_socket.h kea /usr/include/kea/asiolink/openssl_tls.h kea /usr/include/kea/asiolink/process_spawn.h kea /usr/include/kea/asiolink/tcp_acceptor.h kea /usr/include/kea/asiolink/tcp_endpoint.h kea /usr/include/kea/asiolink/tcp_socket.h kea /usr/include/kea/asiolink/tls_acceptor.h kea /usr/include/kea/asiolink/tls_socket.h kea /usr/include/kea/asiolink/udp_endpoint.h kea /usr/include/kea/asiolink/udp_socket.h kea /usr/include/kea/asiolink/unix_domain_socket.h kea /usr/include/kea/asiolink/unix_domain_socket_acceptor.h kea /usr/include/kea/asiolink/unix_domain_socket_endpoint.h kea /usr/include/kea/cc/ kea /usr/include/kea/cc/base_stamped_element.h kea /usr/include/kea/cc/cfg_to_element.h kea /usr/include/kea/cc/command_interpreter.h kea /usr/include/kea/cc/data.h kea /usr/include/kea/cc/dhcp_config_error.h kea /usr/include/kea/cc/element_value.h kea /usr/include/kea/cc/json_feed.h kea /usr/include/kea/cc/server_tag.h kea /usr/include/kea/cc/simple_parser.h kea /usr/include/kea/cc/stamped_element.h kea /usr/include/kea/cc/stamped_value.h kea /usr/include/kea/cc/user_context.h kea /usr/include/kea/cfgrpt/ kea /usr/include/kea/cfgrpt/config_report.h kea /usr/include/kea/config.h kea /usr/include/kea/config/ kea /usr/include/kea/config/base_command_mgr.h kea /usr/include/kea/config/client_connection.h kea /usr/include/kea/config/cmds_impl.h kea /usr/include/kea/config/command_mgr.h kea /usr/include/kea/config/config_log.h kea /usr/include/kea/config/config_messages.h kea /usr/include/kea/config/hooked_command_mgr.h kea /usr/include/kea/config/timeouts.h kea /usr/include/kea/config_backend/ kea /usr/include/kea/config_backend/base_config_backend.h kea /usr/include/kea/config_backend/base_config_backend_mgr.h kea /usr/include/kea/config_backend/base_config_backend_pool.h kea /usr/include/kea/config_backend/constants.h kea /usr/include/kea/cryptolink/ kea /usr/include/kea/cryptolink/crypto_hash.h kea /usr/include/kea/cryptolink/crypto_hmac.h kea /usr/include/kea/cryptolink/crypto_rng.h kea /usr/include/kea/cryptolink/cryptolink.h kea /usr/include/kea/cryptolink/openssl_common.h kea /usr/include/kea/cryptolink/openssl_compat.h kea /usr/include/kea/d2srv/ kea /usr/include/kea/d2srv/d2_cfg_mgr.h kea /usr/include/kea/d2srv/d2_config.h kea /usr/include/kea/d2srv/d2_log.h kea /usr/include/kea/d2srv/d2_messages.h kea /usr/include/kea/d2srv/d2_simple_parser.h kea /usr/include/kea/database/ kea /usr/include/kea/database/audit_entry.h kea /usr/include/kea/database/backend_selector.h kea /usr/include/kea/database/database_connection.h kea /usr/include/kea/database/db_exceptions.h kea /usr/include/kea/database/db_log.h kea /usr/include/kea/database/db_messages.h kea /usr/include/kea/database/dbaccess_parser.h kea /usr/include/kea/database/server.h kea /usr/include/kea/database/server_collection.h kea /usr/include/kea/database/server_selector.h kea /usr/include/kea/dhcp/ kea /usr/include/kea/dhcp/classify.h kea /usr/include/kea/dhcp/dhcp4.h kea /usr/include/kea/dhcp/dhcp6.h kea /usr/include/kea/dhcp/docsis3_option_defs.h kea /usr/include/kea/dhcp/duid.h kea /usr/include/kea/dhcp/duid_factory.h kea /usr/include/kea/dhcp/hwaddr.h kea /usr/include/kea/dhcp/iface_mgr.h kea /usr/include/kea/dhcp/iface_mgr_error_handler.h kea /usr/include/kea/dhcp/libdhcp++.h kea /usr/include/kea/dhcp/opaque_data_tuple.h kea /usr/include/kea/dhcp/option.h kea /usr/include/kea/dhcp/option4_addrlst.h kea /usr/include/kea/dhcp/option4_client_fqdn.h kea /usr/include/kea/dhcp/option6_addrlst.h kea /usr/include/kea/dhcp/option6_auth.h kea /usr/include/kea/dhcp/option6_client_fqdn.h kea /usr/include/kea/dhcp/option6_ia.h kea /usr/include/kea/dhcp/option6_iaaddr.h kea /usr/include/kea/dhcp/option6_iaprefix.h kea /usr/include/kea/dhcp/option6_pdexclude.h kea /usr/include/kea/dhcp/option6_status_code.h kea /usr/include/kea/dhcp/option_custom.h kea /usr/include/kea/dhcp/option_data_types.h kea /usr/include/kea/dhcp/option_definition.h kea /usr/include/kea/dhcp/option_int.h kea /usr/include/kea/dhcp/option_int_array.h kea /usr/include/kea/dhcp/option_opaque_data_tuples.h kea /usr/include/kea/dhcp/option_space.h kea /usr/include/kea/dhcp/option_space_container.h kea /usr/include/kea/dhcp/option_string.h kea /usr/include/kea/dhcp/option_vendor.h kea /usr/include/kea/dhcp/option_vendor_class.h kea /usr/include/kea/dhcp/packet_queue.h kea /usr/include/kea/dhcp/packet_queue_mgr.h kea /usr/include/kea/dhcp/packet_queue_mgr4.h kea /usr/include/kea/dhcp/packet_queue_mgr6.h kea /usr/include/kea/dhcp/packet_queue_ring.h kea /usr/include/kea/dhcp/pkt.h kea /usr/include/kea/dhcp/pkt4.h kea /usr/include/kea/dhcp/pkt4o6.h kea /usr/include/kea/dhcp/pkt6.h kea /usr/include/kea/dhcp/pkt_filter.h kea /usr/include/kea/dhcp/pkt_filter6.h kea /usr/include/kea/dhcp/pkt_filter_inet.h kea /usr/include/kea/dhcp/pkt_filter_inet6.h kea /usr/include/kea/dhcp/pkt_filter_lpf.h kea /usr/include/kea/dhcp/pkt_template.h kea /usr/include/kea/dhcp/protocol_util.h kea /usr/include/kea/dhcp/socket_info.h kea /usr/include/kea/dhcp/std_option_defs.h kea /usr/include/kea/dhcp_ddns/ kea /usr/include/kea/dhcp_ddns/dhcp_ddns_log.h kea /usr/include/kea/dhcp_ddns/dhcp_ddns_messages.h kea /usr/include/kea/dhcp_ddns/ncr_io.h kea /usr/include/kea/dhcp_ddns/ncr_msg.h kea /usr/include/kea/dhcp_ddns/ncr_udp.h kea /usr/include/kea/dhcpsrv/ kea /usr/include/kea/dhcpsrv/alloc_engine.h kea /usr/include/kea/dhcpsrv/alloc_engine_log.h kea /usr/include/kea/dhcpsrv/alloc_engine_messages.h kea /usr/include/kea/dhcpsrv/allocation_state.h kea /usr/include/kea/dhcpsrv/allocator.h kea /usr/include/kea/dhcpsrv/base_host_data_source.h kea /usr/include/kea/dhcpsrv/cache_host_data_source.h kea /usr/include/kea/dhcpsrv/callout_handle_store.h kea /usr/include/kea/dhcpsrv/cb_ctl_dhcp.h kea /usr/include/kea/dhcpsrv/cb_ctl_dhcp4.h kea /usr/include/kea/dhcpsrv/cb_ctl_dhcp6.h kea /usr/include/kea/dhcpsrv/cfg_4o6.h kea /usr/include/kea/dhcpsrv/cfg_consistency.h kea /usr/include/kea/dhcpsrv/cfg_db_access.h kea /usr/include/kea/dhcpsrv/cfg_duid.h kea /usr/include/kea/dhcpsrv/cfg_expiration.h kea /usr/include/kea/dhcpsrv/cfg_globals.h kea /usr/include/kea/dhcpsrv/cfg_host_operations.h kea /usr/include/kea/dhcpsrv/cfg_hosts.h kea /usr/include/kea/dhcpsrv/cfg_hosts_util.h kea /usr/include/kea/dhcpsrv/cfg_iface.h kea /usr/include/kea/dhcpsrv/cfg_mac_source.h kea /usr/include/kea/dhcpsrv/cfg_multi_threading.h kea /usr/include/kea/dhcpsrv/cfg_option.h kea /usr/include/kea/dhcpsrv/cfg_option_def.h kea /usr/include/kea/dhcpsrv/cfg_rsoo.h kea /usr/include/kea/dhcpsrv/cfg_shared_networks.h kea /usr/include/kea/dhcpsrv/cfg_subnets4.h kea /usr/include/kea/dhcpsrv/cfg_subnets6.h kea /usr/include/kea/dhcpsrv/cfgmgr.h kea /usr/include/kea/dhcpsrv/client_class_def.h kea /usr/include/kea/dhcpsrv/config_backend_dhcp4.h kea /usr/include/kea/dhcpsrv/config_backend_dhcp4_mgr.h kea /usr/include/kea/dhcpsrv/config_backend_dhcp6.h kea /usr/include/kea/dhcpsrv/config_backend_dhcp6_mgr.h kea /usr/include/kea/dhcpsrv/config_backend_pool_dhcp4.h kea /usr/include/kea/dhcpsrv/config_backend_pool_dhcp6.h kea /usr/include/kea/dhcpsrv/csv_lease_file4.h kea /usr/include/kea/dhcpsrv/csv_lease_file6.h kea /usr/include/kea/dhcpsrv/d2_client_cfg.h kea /usr/include/kea/dhcpsrv/d2_client_mgr.h kea /usr/include/kea/dhcpsrv/db_type.h kea /usr/include/kea/dhcpsrv/dhcp4o6_ipc.h kea /usr/include/kea/dhcpsrv/dhcpsrv_exceptions.h kea /usr/include/kea/dhcpsrv/dhcpsrv_log.h kea /usr/include/kea/dhcpsrv/dhcpsrv_messages.h kea /usr/include/kea/dhcpsrv/flq_allocation_state.h kea /usr/include/kea/dhcpsrv/flq_allocator.h kea /usr/include/kea/dhcpsrv/host.h kea /usr/include/kea/dhcpsrv/host_container.h kea /usr/include/kea/dhcpsrv/host_data_source_factory.h kea /usr/include/kea/dhcpsrv/host_mgr.h kea /usr/include/kea/dhcpsrv/hosts_log.h kea /usr/include/kea/dhcpsrv/hosts_messages.h kea /usr/include/kea/dhcpsrv/ip_range.h kea /usr/include/kea/dhcpsrv/ip_range_permutation.h kea /usr/include/kea/dhcpsrv/iterative_allocation_state.h kea /usr/include/kea/dhcpsrv/iterative_allocator.h kea /usr/include/kea/dhcpsrv/key_from_key.h kea /usr/include/kea/dhcpsrv/lease.h kea /usr/include/kea/dhcpsrv/lease_file_loader.h kea /usr/include/kea/dhcpsrv/lease_file_stats.h kea /usr/include/kea/dhcpsrv/lease_mgr.h kea /usr/include/kea/dhcpsrv/lease_mgr_factory.h kea /usr/include/kea/dhcpsrv/memfile_lease_limits.h kea /usr/include/kea/dhcpsrv/memfile_lease_mgr.h kea /usr/include/kea/dhcpsrv/memfile_lease_storage.h kea /usr/include/kea/dhcpsrv/mysql_host_data_source.h kea /usr/include/kea/dhcpsrv/mysql_lease_mgr.h kea /usr/include/kea/dhcpsrv/ncr_generator.h kea /usr/include/kea/dhcpsrv/network.h kea /usr/include/kea/dhcpsrv/network_state.h kea /usr/include/kea/dhcpsrv/parsers/ kea /usr/include/kea/dhcpsrv/parsers/base_network_parser.h kea /usr/include/kea/dhcpsrv/parsers/client_class_def_parser.h kea /usr/include/kea/dhcpsrv/parsers/dhcp_parsers.h kea /usr/include/kea/dhcpsrv/parsers/dhcp_queue_control_parser.h kea /usr/include/kea/dhcpsrv/parsers/duid_config_parser.h kea /usr/include/kea/dhcpsrv/parsers/expiration_config_parser.h kea /usr/include/kea/dhcpsrv/parsers/host_reservation_parser.h kea /usr/include/kea/dhcpsrv/parsers/host_reservations_list_parser.h kea /usr/include/kea/dhcpsrv/parsers/ifaces_config_parser.h kea /usr/include/kea/dhcpsrv/parsers/multi_threading_config_parser.h kea /usr/include/kea/dhcpsrv/parsers/option_data_parser.h kea /usr/include/kea/dhcpsrv/parsers/sanity_checks_parser.h kea 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/usr/include/kea/log/buffer_appender_impl.h kea /usr/include/kea/log/interprocess/ kea /usr/include/kea/log/interprocess/interprocess_sync.h kea /usr/include/kea/log/interprocess/interprocess_sync_file.h kea /usr/include/kea/log/interprocess/interprocess_sync_null.h kea /usr/include/kea/log/log_dbglevels.h kea /usr/include/kea/log/log_formatter.h kea /usr/include/kea/log/log_messages.h kea /usr/include/kea/log/logger.h kea /usr/include/kea/log/logger_impl.h kea /usr/include/kea/log/logger_level.h kea /usr/include/kea/log/logger_level_impl.h kea /usr/include/kea/log/logger_manager.h kea /usr/include/kea/log/logger_manager_impl.h kea /usr/include/kea/log/logger_name.h kea /usr/include/kea/log/logger_specification.h kea /usr/include/kea/log/logger_support.h kea /usr/include/kea/log/logger_unittest_support.h kea /usr/include/kea/log/logimpl_messages.h kea /usr/include/kea/log/macros.h kea /usr/include/kea/log/message_dictionary.h kea /usr/include/kea/log/message_exception.h kea /usr/include/kea/log/message_initializer.h kea /usr/include/kea/log/message_reader.h kea /usr/include/kea/log/message_types.h kea /usr/include/kea/log/output_option.h kea /usr/include/kea/mysql/ kea /usr/include/kea/mysql/mysql_binding.h kea /usr/include/kea/mysql/mysql_connection.h kea /usr/include/kea/mysql/mysql_constants.h kea /usr/include/kea/pgsql/ kea /usr/include/kea/pgsql/pgsql_connection.h kea /usr/include/kea/pgsql/pgsql_exchange.h kea /usr/include/kea/process/ kea /usr/include/kea/process/cb_ctl_base.h kea /usr/include/kea/process/config_base.h kea /usr/include/kea/process/config_ctl_info.h kea /usr/include/kea/process/config_ctl_parser.h kea /usr/include/kea/process/d_cfg_mgr.h kea /usr/include/kea/process/d_controller.h kea /usr/include/kea/process/d_log.h kea /usr/include/kea/process/d_process.h kea /usr/include/kea/process/daemon.h kea /usr/include/kea/process/log_parser.h kea /usr/include/kea/process/logging_info.h kea /usr/include/kea/process/process_messages.h kea 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/usr/share/kea/api/config-reload.json kea /usr/share/kea/api/config-set.json kea /usr/share/kea/api/config-test.json kea /usr/share/kea/api/config-write.json kea /usr/share/kea/api/dhcp-disable.json kea /usr/share/kea/api/dhcp-enable.json kea /usr/share/kea/api/extended-info4-upgrade.json kea /usr/share/kea/api/gss-tsig-get-all.json kea /usr/share/kea/api/gss-tsig-get.json kea /usr/share/kea/api/gss-tsig-key-del.json kea /usr/share/kea/api/gss-tsig-key-expire.json kea /usr/share/kea/api/gss-tsig-key-get.json kea /usr/share/kea/api/gss-tsig-list.json kea /usr/share/kea/api/gss-tsig-purge-all.json kea /usr/share/kea/api/gss-tsig-purge.json kea /usr/share/kea/api/gss-tsig-rekey-all.json kea /usr/share/kea/api/gss-tsig-rekey.json kea /usr/share/kea/api/ha-continue.json kea /usr/share/kea/api/ha-heartbeat.json kea /usr/share/kea/api/ha-maintenance-cancel.json kea /usr/share/kea/api/ha-maintenance-notify.json kea /usr/share/kea/api/ha-maintenance-start.json kea /usr/share/kea/api/ha-reset.json kea /usr/share/kea/api/ha-scopes.json kea /usr/share/kea/api/ha-sync-complete-notify.json kea /usr/share/kea/api/ha-sync.json kea /usr/share/kea/api/lease4-add.json kea /usr/share/kea/api/lease4-del.json kea /usr/share/kea/api/lease4-get-all.json kea /usr/share/kea/api/lease4-get-by-client-id.json kea /usr/share/kea/api/lease4-get-by-hostname.json kea /usr/share/kea/api/lease4-get-by-hw-address.json kea /usr/share/kea/api/lease4-get-page.json kea /usr/share/kea/api/lease4-get.json kea /usr/share/kea/api/lease4-resend-ddns.json kea /usr/share/kea/api/lease4-update.json kea /usr/share/kea/api/lease4-wipe.json kea /usr/share/kea/api/lease4-write.json kea /usr/share/kea/api/lease6-add.json kea /usr/share/kea/api/lease6-bulk-apply.json kea /usr/share/kea/api/lease6-del.json kea /usr/share/kea/api/lease6-get-all.json kea /usr/share/kea/api/lease6-get-by-duid.json kea /usr/share/kea/api/lease6-get-by-hostname.json kea /usr/share/kea/api/lease6-get-page.json kea /usr/share/kea/api/lease6-get.json kea /usr/share/kea/api/lease6-resend-ddns.json kea /usr/share/kea/api/lease6-update.json kea /usr/share/kea/api/lease6-wipe.json kea /usr/share/kea/api/lease6-write.json kea /usr/share/kea/api/leases-reclaim.json kea /usr/share/kea/api/libreload.json kea /usr/share/kea/api/list-commands.json kea /usr/share/kea/api/network4-add.json kea /usr/share/kea/api/network4-del.json kea /usr/share/kea/api/network4-get.json kea /usr/share/kea/api/network4-list.json kea /usr/share/kea/api/network4-subnet-add.json kea /usr/share/kea/api/network4-subnet-del.json kea /usr/share/kea/api/network6-add.json kea /usr/share/kea/api/network6-del.json kea /usr/share/kea/api/network6-get.json kea /usr/share/kea/api/network6-list.json kea /usr/share/kea/api/network6-subnet-add.json kea /usr/share/kea/api/network6-subnet-del.json kea /usr/share/kea/api/remote-class4-del.json kea /usr/share/kea/api/remote-class4-get-all.json kea /usr/share/kea/api/remote-class4-get.json kea /usr/share/kea/api/remote-class4-set.json kea /usr/share/kea/api/remote-class6-del.json kea /usr/share/kea/api/remote-class6-get-all.json kea /usr/share/kea/api/remote-class6-get.json kea /usr/share/kea/api/remote-class6-set.json kea /usr/share/kea/api/remote-global-parameter4-del.json kea /usr/share/kea/api/remote-global-parameter4-get-all.json kea /usr/share/kea/api/remote-global-parameter4-get.json kea /usr/share/kea/api/remote-global-parameter4-set.json kea /usr/share/kea/api/remote-global-parameter6-del.json kea /usr/share/kea/api/remote-global-parameter6-get-all.json kea /usr/share/kea/api/remote-global-parameter6-get.json kea /usr/share/kea/api/remote-global-parameter6-set.json kea /usr/share/kea/api/remote-network4-del.json kea /usr/share/kea/api/remote-network4-get.json kea /usr/share/kea/api/remote-network4-list.json kea /usr/share/kea/api/remote-network4-set.json kea /usr/share/kea/api/remote-network6-del.json kea /usr/share/kea/api/remote-network6-get.json kea /usr/share/kea/api/remote-network6-list.json kea /usr/share/kea/api/remote-network6-set.json kea /usr/share/kea/api/remote-option-def4-del.json kea /usr/share/kea/api/remote-option-def4-get-all.json kea /usr/share/kea/api/remote-option-def4-get.json kea /usr/share/kea/api/remote-option-def4-set.json kea /usr/share/kea/api/remote-option-def6-del.json kea /usr/share/kea/api/remote-option-def6-get-all.json kea /usr/share/kea/api/remote-option-def6-get.json kea /usr/share/kea/api/remote-option-def6-set.json kea /usr/share/kea/api/remote-option4-global-del.json kea /usr/share/kea/api/remote-option4-global-get-all.json kea /usr/share/kea/api/remote-option4-global-get.json kea /usr/share/kea/api/remote-option4-global-set.json kea /usr/share/kea/api/remote-option4-network-del.json kea /usr/share/kea/api/remote-option4-network-set.json kea /usr/share/kea/api/remote-option4-pool-del.json kea /usr/share/kea/api/remote-option4-pool-set.json kea /usr/share/kea/api/remote-option4-subnet-del.json kea /usr/share/kea/api/remote-option4-subnet-set.json kea /usr/share/kea/api/remote-option6-global-del.json kea /usr/share/kea/api/remote-option6-global-get-all.json kea /usr/share/kea/api/remote-option6-global-get.json kea /usr/share/kea/api/remote-option6-global-set.json kea /usr/share/kea/api/remote-option6-network-del.json kea /usr/share/kea/api/remote-option6-network-set.json kea /usr/share/kea/api/remote-option6-pd-pool-del.json kea /usr/share/kea/api/remote-option6-pd-pool-set.json kea /usr/share/kea/api/remote-option6-pool-del.json kea /usr/share/kea/api/remote-option6-pool-set.json kea /usr/share/kea/api/remote-option6-subnet-del.json kea /usr/share/kea/api/remote-option6-subnet-set.json kea /usr/share/kea/api/remote-server4-del.json kea /usr/share/kea/api/remote-server4-get-all.json kea /usr/share/kea/api/remote-server4-get.json kea /usr/share/kea/api/remote-server4-set.json kea /usr/share/kea/api/remote-server6-del.json kea /usr/share/kea/api/remote-server6-get-all.json kea /usr/share/kea/api/remote-server6-get.json kea /usr/share/kea/api/remote-server6-set.json kea /usr/share/kea/api/remote-subnet4-del-by-id.json kea /usr/share/kea/api/remote-subnet4-del-by-prefix.json kea /usr/share/kea/api/remote-subnet4-get-by-id.json kea /usr/share/kea/api/remote-subnet4-get-by-prefix.json kea /usr/share/kea/api/remote-subnet4-list.json kea /usr/share/kea/api/remote-subnet4-set.json kea /usr/share/kea/api/remote-subnet6-del-by-id.json kea /usr/share/kea/api/remote-subnet6-del-by-prefix.json kea /usr/share/kea/api/remote-subnet6-get-by-id.json kea /usr/share/kea/api/remote-subnet6-get-by-prefix.json kea /usr/share/kea/api/remote-subnet6-list.json kea /usr/share/kea/api/remote-subnet6-set.json kea /usr/share/kea/api/reservation-add.json kea /usr/share/kea/api/reservation-del.json kea /usr/share/kea/api/reservation-get-all.json kea /usr/share/kea/api/reservation-get-by-address.json kea /usr/share/kea/api/reservation-get-by-hostname.json kea /usr/share/kea/api/reservation-get-by-id.json kea /usr/share/kea/api/reservation-get-page.json kea /usr/share/kea/api/reservation-get.json kea /usr/share/kea/api/reservation-update.json kea /usr/share/kea/api/server-tag-get.json kea /usr/share/kea/api/shutdown.json kea /usr/share/kea/api/stat-lease4-get.json kea /usr/share/kea/api/stat-lease6-get.json kea /usr/share/kea/api/statistic-get-all.json kea /usr/share/kea/api/statistic-get.json kea /usr/share/kea/api/statistic-remove-all.json kea /usr/share/kea/api/statistic-remove.json kea /usr/share/kea/api/statistic-reset-all.json kea /usr/share/kea/api/statistic-reset.json kea /usr/share/kea/api/statistic-sample-age-set-all.json kea /usr/share/kea/api/statistic-sample-age-set.json kea /usr/share/kea/api/statistic-sample-count-set-all.json kea /usr/share/kea/api/statistic-sample-count-set.json kea /usr/share/kea/api/status-get.json kea /usr/share/kea/api/subnet4-add.json kea /usr/share/kea/api/subnet4-del.json kea /usr/share/kea/api/subnet4-delta-add.json kea /usr/share/kea/api/subnet4-delta-del.json kea /usr/share/kea/api/subnet4-get.json kea /usr/share/kea/api/subnet4-list.json kea /usr/share/kea/api/subnet4-update.json kea /usr/share/kea/api/subnet6-add.json kea /usr/share/kea/api/subnet6-del.json kea /usr/share/kea/api/subnet6-delta-add.json kea /usr/share/kea/api/subnet6-delta-del.json kea /usr/share/kea/api/subnet6-get.json kea /usr/share/kea/api/subnet6-list.json kea /usr/share/kea/api/subnet6-update.json kea /usr/share/kea/api/version-get.json kea /usr/share/kea/scripts/ kea /usr/share/kea/scripts/admin-utils.sh kea /usr/share/kea/scripts/mysql/ kea /usr/share/kea/scripts/mysql/dhcpdb_create.mysql kea /usr/share/kea/scripts/mysql/dhcpdb_drop.mysql kea /usr/share/kea/scripts/mysql/upgrade_001.0_to_002.0.sh kea /usr/share/kea/scripts/mysql/upgrade_002.0_to_003.0.sh kea /usr/share/kea/scripts/mysql/upgrade_003.0_to_004.0.sh kea /usr/share/kea/scripts/mysql/upgrade_004.0_to_004.1.sh kea /usr/share/kea/scripts/mysql/upgrade_004.1_to_005.0.sh kea /usr/share/kea/scripts/mysql/upgrade_005.0_to_005.1.sh kea /usr/share/kea/scripts/mysql/upgrade_005.1_to_005.2.sh kea /usr/share/kea/scripts/mysql/upgrade_005.2_to_006.0.sh kea /usr/share/kea/scripts/mysql/upgrade_006.0_to_007.0.sh kea /usr/share/kea/scripts/mysql/upgrade_007.0_to_008.0.sh kea /usr/share/kea/scripts/mysql/upgrade_008.0_to_008.1.sh kea /usr/share/kea/scripts/mysql/upgrade_008.1_to_008.2.sh kea /usr/share/kea/scripts/mysql/upgrade_008.2_to_009.0.sh kea /usr/share/kea/scripts/mysql/upgrade_009.0_to_009.1.sh kea /usr/share/kea/scripts/mysql/upgrade_009.1_to_009.2.sh kea /usr/share/kea/scripts/mysql/upgrade_009.2_to_009.3.sh kea /usr/share/kea/scripts/mysql/upgrade_009.3_to_009.4.sh kea /usr/share/kea/scripts/mysql/upgrade_009.4_to_009.5.sh kea /usr/share/kea/scripts/mysql/upgrade_009.5_to_009.6.sh kea /usr/share/kea/scripts/mysql/upgrade_009.6_to_010.0.sh kea /usr/share/kea/scripts/mysql/upgrade_010_to_011.sh kea /usr/share/kea/scripts/mysql/upgrade_011_to_012.sh kea /usr/share/kea/scripts/mysql/upgrade_012_to_013.sh kea /usr/share/kea/scripts/mysql/upgrade_013_to_014.sh kea /usr/share/kea/scripts/mysql/upgrade_014_to_015.sh kea /usr/share/kea/scripts/mysql/upgrade_015_to_016.sh kea /usr/share/kea/scripts/mysql/upgrade_016_to_017.sh kea /usr/share/kea/scripts/mysql/upgrade_017_to_018.sh kea /usr/share/kea/scripts/mysql/upgrade_018_to_019.sh kea /usr/share/kea/scripts/mysql/wipe_data.sh kea /usr/share/kea/scripts/pgsql/ kea /usr/share/kea/scripts/pgsql/dhcpdb_create.pgsql kea /usr/share/kea/scripts/pgsql/dhcpdb_drop.pgsql kea /usr/share/kea/scripts/pgsql/upgrade_001.0_to_002.0.sh kea /usr/share/kea/scripts/pgsql/upgrade_002.0_to_003.0.sh kea /usr/share/kea/scripts/pgsql/upgrade_003.0_to_003.1.sh kea /usr/share/kea/scripts/pgsql/upgrade_003.1_to_003.2.sh kea /usr/share/kea/scripts/pgsql/upgrade_003.2_to_003.3.sh kea /usr/share/kea/scripts/pgsql/upgrade_003.3_to_004.0.sh kea /usr/share/kea/scripts/pgsql/upgrade_004.0_to_005.0.sh kea /usr/share/kea/scripts/pgsql/upgrade_005.0_to_005.1.sh kea /usr/share/kea/scripts/pgsql/upgrade_005.1_to_006.0.sh kea /usr/share/kea/scripts/pgsql/upgrade_006.0_to_006.1.sh kea /usr/share/kea/scripts/pgsql/upgrade_006.1_to_006.2.sh kea /usr/share/kea/scripts/pgsql/upgrade_006.2_to_007.0.sh kea /usr/share/kea/scripts/pgsql/upgrade_007_to_008.sh kea /usr/share/kea/scripts/pgsql/upgrade_008_to_009.sh kea /usr/share/kea/scripts/pgsql/upgrade_009_to_010.sh kea /usr/share/kea/scripts/pgsql/upgrade_010_to_011.sh kea /usr/share/kea/scripts/pgsql/upgrade_011_to_012.sh kea /usr/share/kea/scripts/pgsql/upgrade_012_to_013.sh kea /usr/share/kea/scripts/pgsql/upgrade_013_to_014.sh kea /usr/share/kea/scripts/pgsql/upgrade_014_to_015.sh kea /usr/share/kea/scripts/pgsql/upgrade_015_to_016.sh kea /usr/share/kea/scripts/pgsql/upgrade_016_to_017.sh kea /usr/share/kea/scripts/pgsql/upgrade_017_to_018.sh kea /usr/share/kea/scripts/pgsql/wipe_data.sh kea /var/ kea /var/lib/ kea /var/lib/kea/ kea /var/log/
Dokumentation
Eine ausführliche Onlinedokumentation des modernen Open Source DHCPv4 & DHCPv6 Server Kea findet sich auf der entsprechenden Dokumentationsseite bei Read the Docs → https://kea.readthedocs.io/en/latest/ .
Konfiguration
Die Konfiguration unseres DHCPv4 und DHCPv6-Servers wie auch des Controll-Agenten und ggf. des Kea DHCP DDNS Daemaons erfolgt über JSON-Konfigurationsdateien im Verzeichnis /etc/kea/
.
DHCPv4 Server
Zunächst wollen wir uns eingehend mit der Konfiguration unseres DHCPv4-Daemons befassen. Die zugehörige Original-Dokumentation findet sich im Abschnitt 8.2. DHCPv4 Server Configuration.
In unserer Betriebsumgebung haben wir folgende Rahmenbedingungen für unseren DHCPv4-Server:
- Netzwerkinterface :
Unser DHCPv4-Daemon soll auf dem Netzwerkinterfaceeth1
auf entsprechende Adressanfragen lauschen und ausliefern. - Leases :
In unserer Beispielumgebung sollen die Leases unserer Clients in einer Datei vorgehalten werden. Optional wäre auch die Speicherung in einer Marais-/mySQL-Datenbank oder in einer PostgreSQL-Datenbank denkbar. Aber im ersten Schritt wollen wir uns mal mit einer Ablage in einer Datei begnügen.
Bei der Installation unseres Kea-Servers wurde uns eine entsprechende Musterkonfigurations-Datei bereits mitgeliefert.
# less /etc/kea/kea-dhcp4.conf
// This is a basic configuration for the Kea DHCPv4 server. Subnet declarations // are mostly commented out and no interfaces are listed. Therefore, the servers // will not listen or respond to any queries. // The basic configuration must be extended to specify interfaces on which // the servers should listen. There are a number of example options defined. // These probably don't make any sense in your network. Make sure you at least // update the following, before running this example in your network: // - change the network interface names // - change the subnets to match your actual network // - change the option values to match your network // // This is just a very basic configuration. Kea comes with large suite (over 30) // of configuration examples and extensive Kea User's Guide. Please refer to // those materials to get better understanding of what this software is able to // do. Comments in this configuration file sometimes refer to sections for more // details. These are section numbers in Kea User's Guide. The version matching // your software should come with your Kea package, but it is also available // in ISC's Knowledgebase (https://kea.readthedocs.io; the direct link for // the stable version is https://kea.readthedocs.io/). // // This configuration file contains only DHCPv4 server's configuration. // If configurations for other Kea services are also included in this file they // are ignored by the DHCPv4 server. { // DHCPv4 configuration starts here. This section will be read by DHCPv4 server // and will be ignored by other components. "Dhcp4": { // Add names of your network interfaces to listen on. "interfaces-config": { // See section 8.2.4 for more details. You probably want to add just // interface name (e.g. "eth0" or specific IPv4 address on that // interface name (e.g. "eth0/192.0.2.1"). "interfaces": [ ] // Kea DHCPv4 server by default listens using raw sockets. This ensures // all packets, including those sent by directly connected clients // that don't have IPv4 address yet, are received. However, if your // traffic is always relayed, it is often better to use regular // UDP sockets. If you want to do that, uncomment this line: // "dhcp-socket-type": "udp" }, // Kea supports control channel, which is a way to receive management // commands while the server is running. This is a Unix domain socket that // receives commands formatted in JSON, e.g. config-set (which sets new // configuration), config-reload (which tells Kea to reload its // configuration from file), statistic-get (to retrieve statistics) and many // more. For detailed description, see Sections 8.8, 16 and 15. "control-socket": { "socket-type": "unix", "socket-name": "/tmp/kea4-ctrl-socket" }, // Use Memfile lease database backend to store leases in a CSV file. // Depending on how Kea was compiled, it may also support SQL databases // (MySQL and/or PostgreSQL). Those database backends require more // parameters, like name, host and possibly user and password. // There are dedicated examples for each backend. See Section 7.2.2 "Lease // Storage" for details. "lease-database": { // Memfile is the simplest and easiest backend to use. It's an in-memory // C++ database that stores its state in CSV file. "type": "memfile", "lfc-interval": 3600 }, // Kea allows storing host reservations in a database. If your network is // small or you have few reservations, it's probably easier to keep them // in the configuration file. If your network is large, it's usually better // to use database for it. To enable it, uncomment the following: // "hosts-database": { // "type": "mysql", // "name": "kea", // "user": "kea", // "password": "kea", // "host": "localhost", // "port": 3306 // }, // See Section 7.2.3 "Hosts storage" for details. // Setup reclamation of the expired leases and leases affinity. // Expired leases will be reclaimed every 10 seconds. Every 25 // seconds reclaimed leases, which have expired more than 3600 // seconds ago, will be removed. The limits for leases reclamation // are 100 leases or 250 ms for a single cycle. A warning message // will be logged if there are still expired leases in the // database after 5 consecutive reclamation cycles. // 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 the lease storage. "expired-leases-processing": { "reclaim-timer-wait-time": 10, "flush-reclaimed-timer-wait-time": 25, "hold-reclaimed-time": 3600, "max-reclaim-leases": 100, "max-reclaim-time": 250, "unwarned-reclaim-cycles": 5 }, // Global timers specified here apply to all subnets, unless there are // subnet specific values defined in particular subnets. "renew-timer": 900, "rebind-timer": 1800, "valid-lifetime": 3600, // Many additional parameters can be specified here: // - option definitions (if you want to define vendor options, your own // custom options or perhaps handle standard options // that Kea does not support out of the box yet) // - client classes // - hooks // - ddns information (how the DHCPv4 component can reach a DDNS daemon) // // Some of them have examples below, but there are other parameters. // Consult Kea User's Guide to find out about them. // These are global options. They are going to be sent when a client // requests them, unless overwritten with values in more specific scopes. // The scope hierarchy is: // - global (most generic, can be overwritten by class, subnet or host) // - class (can be overwritten by subnet or host) // - subnet (can be overwritten by host) // - host (most specific, overwrites any other scopes) // // Not all of those options make sense. Please configure only those that // are actually useful in your network. // // For a complete list of options currently supported by Kea, see // Section 7.2.8 "Standard DHCPv4 Options". Kea also supports // vendor options (see Section 7.2.10) and allows users to define their // own custom options (see Section 7.2.9). "option-data": [ // When specifying options, you typically need to specify // one of (name or code) and data. The full option specification // covers name, code, space, csv-format and data. // space defaults to "dhcp4" which is usually correct, unless you // use encapsulate options. csv-format defaults to "true", so // this is also correct, unless you want to specify the whole // option value as long hex string. For example, to specify // domain-name-servers you could do this: // { // "name": "domain-name-servers", // "code": 6, // "csv-format": "true", // "space": "dhcp4", // "data": "192.0.2.1, 192.0.2.2" // } // but it's a lot of writing, so it's easier to do this instead: { "name": "domain-name-servers", "data": "192.0.2.1, 192.0.2.2" }, // Typically people prefer to refer to options by their names, so they // don't need to remember the code names. However, some people like // to use numerical values. For example, option "domain-name" uses // option code 15, so you can reference to it either by // "name": "domain-name" or "code": 15. { "code": 15, "data": "example.org" }, // Domain search is also a popular option. It tells the client to // attempt to resolve names within those specified domains. For // example, name "foo" would be attempted to be resolved as // foo.mydomain.example.com and if it fails, then as foo.example.com { "name": "domain-search", "data": "mydomain.example.com, example.com" }, // String options that have a comma in their values need to have // it escaped (i.e. each comma is preceded by two backslashes). // That's because commas are reserved for separating fields in // compound options. At the same time, we need to be conformant // with JSON spec, that does not allow "\,". Therefore the // slightly uncommon double backslashes notation is needed. // Legal JSON escapes are \ followed by "\/bfnrt character // or \u followed by 4 hexadecimal numbers (currently Kea // supports only \u0000 to \u00ff code points). // CSV processing translates '\\' into '\' and '\,' into ',' // only so for instance '\x' is translated into '\x'. But // as it works on a JSON string value each of these '\' // characters must be doubled on JSON input. { "name": "boot-file-name", "data": "EST5EDT4\\,M3.2.0/02:00\\,M11.1.0/02:00" }, // Options that take integer values can either be specified in // dec or hex format. Hex format could be either plain (e.g. abcd) // or prefixed with 0x (e.g. 0xabcd). { "name": "default-ip-ttl", "data": "0xf0" } // Note that Kea provides some of the options on its own. In particular, // it sends IP Address lease type (code 51, based on valid-lifetime // parameter, Subnet mask (code 1, based on subnet definition), Renewal // time (code 58, based on renew-timer parameter), Rebind time (code 59, // based on rebind-timer parameter). ], // Other global parameters that can be defined here are option definitions // (this is useful if you want to use vendor options, your own custom // options or perhaps handle options that Kea does not handle out of the box // yet). // You can also define classes. If classes are defined, incoming packets // may be assigned to specific classes. A client class can represent any // group of devices that share some common characteristic, e.g. Windows // devices, iphones, broken printers that require special options, etc. // Based on the class information, you can then allow or reject clients // to use certain subnets, add special options for them or change values // of some fixed fields. "client-classes": [ { // This specifies a name of this class. It's useful if you need to // reference this class. "name": "voip", // This is a test. It is an expression that is being evaluated on // each incoming packet. It is supposed to evaluate to either // true or false. If it's true, the packet is added to specified // class. See Section 12 for a list of available expressions. There // are several dozens. Section 8.2.14 for more details for DHCPv4 // classification and Section 9.2.19 for DHCPv6. "test": "substring(option[60].hex,0,6) == 'Aastra'", // If a client belongs to this class, you can define extra behavior. // For example, certain fields in DHCPv4 packet will be set to // certain values. "next-server": "192.0.2.254", "server-hostname": "hal9000", "boot-file-name": "/dev/null" // You can also define option values here if you want devices from // this class to receive special options. } ], // Another thing possible here are hooks. Kea supports a powerful mechanism // that allows loading external libraries that can extract information and // even influence how the server processes packets. Those libraries include // additional forensic logging capabilities, ability to reserve hosts in // more flexible ways, and even add extra commands. For a list of available // hook libraries, see https://gitlab.isc.org/isc-projects/kea/wikis/Hooks-available. // "hooks-libraries": [ // { // // Forensic Logging library generates forensic type of audit trail // // of all devices serviced by Kea, including their identifiers // // (like MAC address), their location in the network, times // // when they were active etc. // "library": "/usr/lib/kea/hooks/libdhcp_legal_log.so", // "parameters": { // "path": "/var/lib/kea", // "base-name": "kea-forensic4" // } // }, // { // // Flexible identifier (flex-id). Kea software provides a way to // // handle host reservations that include addresses, prefixes, // // options, client classes and other features. The reservation can // // be based on hardware address, DUID, circuit-id or client-id in // // DHCPv4 and using hardware address or DUID in DHCPv6. However, // // there are sometimes scenario where the reservation is more // // complex, e.g. uses other options that mentioned above, uses part // // of specific options or perhaps even a combination of several // // options and fields to uniquely identify a client. Those scenarios // // are addressed by the Flexible Identifiers hook application. // "library": "/usr/lib/kea/hooks/libdhcp_flex_id.so", // "parameters": { // "identifier-expression": "relay4[2].hex" // } // } // ], // Below an example of a simple IPv4 subnet declaration. Uncomment to enable // it. This is a list, denoted with [ ], of structures, each denoted with // { }. Each structure describes a single subnet and may have several // parameters. One of those parameters is "pools" that is also a list of // structures. "subnet4": [ { // This defines the whole subnet. Kea will use this information to // determine where the clients are connected. This is the whole // subnet in your network. // Subnet identifier should be unique for each subnet. "id": 1, // This is mandatory parameter for each subnet. "subnet": "192.0.2.0/24", // Pools define the actual part of your subnet that is governed // by Kea. Technically this is optional parameter, but it's // almost always needed for DHCP to do its job. If you omit it, // clients won't be able to get addresses, unless there are // host reservations defined for them. "pools": [ { "pool": "192.0.2.1 - 192.0.2.200" } ], // These are options that are subnet specific. In most cases, // you need to define at least routers option, as without this // option your clients will not be able to reach their default // gateway and will not have Internet connectivity. "option-data": [ { // For each IPv4 subnet you most likely need to specify at // least one router. "name": "routers", "data": "192.0.2.1" } ], // Kea offers host reservations mechanism. 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). // // Kea also support flexible identifier (flex-id), which lets you // specify an expression that is evaluated for each incoming packet. // Resulting value is then used for as an identifier. // // Note that reservations are subnet-specific in Kea. This is // different than ISC DHCP. Keep that in mind when migrating // your configurations. "reservations": [ // This is a reservation for a specific hardware/MAC address. // It's a rather simple reservation: just an address and nothing // else. { "hw-address": "1a:1b:1c:1d:1e:1f", "ip-address": "192.0.2.201" }, // 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": "192.0.2.202", "hostname": "special-snowflake" }, // The third reservation is based on DUID. This reservation defines // a 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. // // When using reservations, it is useful to configure // reservations-global, reservations-in-subnet, // reservations-out-of-pool (subnet specific parameters) // and host-reservation-identifiers (global parameter). { "client-id": "01:12:23:34:45:56:67", "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" } ] }, // This reservation is for a client that needs specific DHCPv4 // fields to be set. Three supported fields are next-server, // server-hostname and boot-file-name { "client-id": "01:0a:0b:0c:0d:0e:0f", "ip-address": "192.0.2.205", "next-server": "192.0.2.1", "server-hostname": "hal9000", "boot-file-name": "/dev/null" }, // This reservation is using flexible identifier. Instead of // relying on specific field, sysadmin can define an expression // similar to what is used for client classification, // e.g. substring(relay[0].option[17],0,6). Then, based on the // value of that expression for incoming packet, the reservation // is matched. Expression can be specified either as hex or // plain text using single quotes. // // Note: flexible identifier requires flex_id hook library to be // loaded to work. { "flex-id": "'s0mEVaLue'", "ip-address": "192.0.2.206" } // You can add more reservations here. ] // You can add more subnets there. } ], // There are many, many more parameters that DHCPv4 server is able to use. // They were not added here to not overwhelm people with too much // information at once. // Logging configuration starts here. Kea uses different loggers to log various // activities. For details (e.g. names of loggers), see Chapter 18. "loggers": [ { // This section affects kea-dhcp4, which is the base logger for DHCPv4 // component. It tells DHCPv4 server to write all log messages (on // severity INFO or more) to a file. "name": "kea-dhcp4", "output_options": [ { // Specifies the output file. There are several special values // supported: // - stdout (prints on standard output) // - stderr (prints on standard error) // - syslog (logs to syslog) // - syslog:name (logs to syslog using specified name) // Any other value is considered a name of the file "output": "/var/log/kea-dhcp4.log" // Shorter log pattern suitable for use with systemd, // avoids redundant information // "pattern": "%-5p %m\n", // This governs whether the log output is flushed to disk after // every write. // "flush": false, // This specifies the maximum size of the file before it is // rotated. // "maxsize": 1048576, // This specifies the maximum number of rotated files to keep. // "maxver": 8 } ], // This specifies the severity of log messages to keep. Supported values // are: FATAL, ERROR, WARN, INFO, DEBUG "severity": "INFO", // If DEBUG level is specified, this value is used. 0 is least verbose, // 99 is most verbose. Be cautious, Kea can generate lots and lots // of logs if told to do so. "debuglevel": 0 } ] } }
Bevor wir nun aber unseren Kea-DHCPv4-Daemon individuell nach unseren Bedürfnissen hin anpassen, werden wir zunächst die im Paket mitgelieferte Original-Konfigurationsdatei /etc/kea/kea-dhcp4.conf
für spätere Referenzen sichern.
# cp -a /etc/kea/kea-dhcp4.conf /etc/kea/kea-dhcp4.conf.orig
So können wir später bei etwaigen Bedarf Vergleiche zur originalen Konfigurationsdatei mit unserer individuellen Konfigurationsdatei anstreben, wie in diesem Beispiel hier:
# vimdiff /etc/kea/kea-dhcp4.conf /etc/kea/kea-dhcp4.conf.orig