dhcp4_messages.mes

# Copyright (C) 2012-2024 Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

$NAMESPACE isc::dhcp

% DHCP4_ACTIVATE_INTERFACE activating interface %1
This message is printed when DHCPv4 server enabled an interface to be used
to receive DHCPv4 traffic. IPv4 socket on this interface will be opened once
Interface Manager starts up procedure of opening sockets.

% DHCP4_ALREADY_RUNNING %1 already running? %2
This is an error message that occurs when the DHCPv4 server encounters
a pre-existing PID file which contains the PID of a running process.
This most likely indicates an attempt to start a second instance of
the server using the same configuration file.  It is possible, though
unlikely that the PID file is a remnant left behind by a server crash or
power failure and the PID it contains refers to a process other than
the server.  In such an event, it would be necessary to manually remove
the PID file.  The first argument is the DHCPv4 process name, the
second contains the PID and PID file.

% DHCP4_BUFFER_RECEIVED received buffer from %1:%2 to %3:%4 over interface %5
This debug message is logged when the server has received a packet
over the socket. When the message is logged the contents of the received
packet hasn't been parsed yet. The only available information is the
interface and the source and destination IPv4 addresses/ports.

% DHCP4_BUFFER_RECEIVE_FAIL error on attempt to receive packet: %1
The DHCPv4 server tried to receive a packet but an error
occurred during this attempt. The reason for the error is included in
the message.

% DHCP4_BUFFER_UNPACK parsing buffer received from %1 to %2 over interface %3
This debug message is issued when the server starts parsing the received
buffer holding the DHCPv4 message. The arguments specify the source and
destination IPv4 addresses as well as the interface over which the buffer has
been received.

% DHCP4_BUFFER_WAIT_SIGNAL signal received while waiting for next packet
This debug message is issued when the server was waiting for the
packet, but the wait has been interrupted by the signal received
by the process. The signal will be handled before the server starts
waiting for next packets.

% DHCP4_CB_ON_DEMAND_FETCH_UPDATES_FAIL error on demand attempt to fetch configuration updates from the configuration backend(s): %1
This error message is issued when the server attempted to fetch
configuration updates from the database and this on demand attempt failed.
The sole argument which is returned to the config-backend-pull command
caller too contains the reason for failure.

% DHCP4_CB_PERIODIC_FETCH_UPDATES_FAIL error on periodic attempt to fetch configuration updates from the configuration backend(s): %1
This error message is issued when the server attempted to fetch
configuration updates from the database and this periodic attempt failed.
The server will re-try according to the configured value of the
config-fetch-wait-time parameter. The sole argument contains the
reason for failure.

% DHCP4_CB_PERIODIC_FETCH_UPDATES_RETRIES_EXHAUSTED maximum number of configuration fetch attempts: 10, has been exhausted without success
This error indicates that the server has made a number of unsuccessful
periodic attempts to fetch configuration updates from a configuration backend.
The server will continue to operate but won't make any further attempts
to fetch configuration updates. The administrator must fix the configuration
in the database and reload (or restart) the server.

% DHCP4_CLASSES_ASSIGNED %1: client packet has been assigned on %2 message to the following classes: %3
This debug message informs that incoming packet has been assigned to specified
classes. This is a normal behavior and indicates successful operation.
The first argument specifies the client and transaction identification
information. The second argument specifies the DHCPv4 message type. The third
argument includes all classes to which the packet has been assigned.

% DHCP4_CLASSES_ASSIGNED_AFTER_SUBNET_SELECTION %1: client packet has been assigned to the following classes: %2
This debug message informs that incoming packet has been assigned to specified
classes. This is a normal behavior and indicates successful operation.
The first argument specifies the client and transaction identification
information. The second argument includes all classes to which the packet has
been assigned.

% DHCP4_CLASS_ASSIGNED %1: client packet has been assigned to the following class: %2
This debug message informs that incoming packet has been assigned to specified
class. This is a normal behavior and indicates successful operation.
The first argument specifies the client and transaction identification
information. The second argument includes the new class to which the
packet has been assigned.

% DHCP4_CLASS_UNCONFIGURED %1: client packet belongs to an unconfigured class: %2
This debug message informs that incoming packet belongs to a class
which cannot be found in the configuration. Either a hook written
before the classification was added to Kea is used, or class naming is
inconsistent.

% DHCP4_CLASS_UNDEFINED required class %1 has no definition
This debug message informs that a class is listed for required evaluation but
has no definition.

% DHCP4_CLASS_UNTESTABLE required class %1 has no test expression
This debug message informs that a class was listed for required evaluation but
its definition does not include a test expression to evaluate.

% DHCP4_CLIENTID_IGNORED_FOR_LEASES %1: not using client identifier for lease allocation for subnet %2
This debug message is issued when the server is processing the DHCPv4 message
for which client identifier will not be used when allocating new lease or
renewing existing lease. The server is explicitly configured to not use
client identifier to lookup existing leases for the client and will not
record client identifier in the lease database. This mode of operation
is useful when clients don't use stable client identifiers, e.g. multi
stage booting. The first argument includes the client and transaction
identification information. The second argument specifies the identifier
of the subnet where the client is connected and for which this mode of
operation is configured on the server.

% DHCP4_CLIENT_FQDN_DATA %1: Client sent FQDN option: %2
This debug message includes the detailed information extracted from the
Client FQDN option sent in the query. The first argument includes the
client and transaction identification information. The second argument
specifies the detailed information about the FQDN option received
by the server.

% DHCP4_CLIENT_FQDN_PROCESS %1: processing Client FQDN option
This debug message is issued when the server starts processing the Client
FQDN option sent in the client's query. The argument includes the
client and transaction identification information.

% DHCP4_CLIENT_HOSTNAME_DATA %1: client sent Hostname option: %2
This debug message includes the detailed information extracted from the
Hostname option sent in the query. The first argument includes the
client and transaction identification information. The second argument
specifies the hostname carried in the Hostname option sent by the
client.

% DHCP4_CLIENT_HOSTNAME_MALFORMED %1: client hostname option malformed: %2
This debug message is issued when the DHCP server was unable to process the
the hostname option sent by the client because the content is malformed.
The first argument includes the client and transaction identification
information. The second argument contains a description of the data error.

% DHCP4_CLIENT_HOSTNAME_PROCESS %1: processing client's Hostname option
This debug message is issued when the server starts processing the Hostname
option sent in the client's query. The argument includes the client and
transaction identification information.

% DHCP4_CLIENT_NAME_PROC_FAIL %1: failed to process the fqdn or hostname sent by a client: %2
This debug message is issued when the DHCP server was unable to process the
FQDN or Hostname option sent by a client. This is likely because the client's
name was malformed or due to internal server error. The first argument
contains the client and transaction identification information. The
second argument holds the detailed description of the error.

% DHCP4_CONFIG_COMPLETE DHCPv4 server has completed configuration: %1
This is an informational message announcing the successful processing of a
new configuration. It is output during server startup, and when an updated
configuration is committed by the administrator.  Additional information
may be provided.

% DHCP4_CONFIG_FETCH Fetching configuration data from config backends.
This is an informational message emitted when the DHCPv4 server about to begin
retrieving configuration data from one or more configuration backends.

% DHCP4_CONFIG_LOAD_FAIL configuration error using file: %1, reason: %2
This error message indicates that the DHCPv4 configuration has failed.
If this is an initial configuration (during server's startup) the server
will fail to start. If this is a dynamic reconfiguration attempt the
server will continue to use an old configuration.

% DHCP4_CONFIG_NEW_SUBNET a new subnet has been added to configuration: %1
This is an informational message reporting that the configuration has
been extended to include the specified IPv4 subnet.

% DHCP4_CONFIG_OPTION_DUPLICATE multiple options with the code %1 added to the subnet %2
This warning message is issued on an attempt to configure multiple options
with the same option code for a particular subnet. Adding multiple options
is uncommon for DHCPv4, but is not prohibited.

% DHCP4_CONFIG_PACKET_QUEUE DHCPv4 packet queue info after configuration: %1
This informational message is emitted during DHCPv4 server configuration,
immediately after configuring the DHCPv4 packet queue.  The information
shown depends upon the packet queue type selected.

% DHCP4_CONFIG_RECEIVED received configuration %1
A debug message listing the configuration received by the DHCPv4 server.
The source of that configuration depends on used configuration backend.

% DHCP4_CONFIG_START DHCPv4 server is processing the following configuration: %1
This is a debug message that is issued every time the server receives a
configuration. That happens at start up and also when a server configuration
change is committed by the administrator.

% DHCP4_CONFIG_SYNTAX_WARNING configuration syntax warning: %1
This warning message indicates that the DHCPv4 configuration had a minor
syntax error. The error was displayed and the configuration parsing resumed.

% DHCP4_CONFIG_UNRECOVERABLE_ERROR DHCPv4 server new configuration failed with an error which cannot be recovered
This fatal error message is issued when a new configuration raised an error
which cannot be recovered. A correct configuration must be applied as soon
as possible as the server is no longer working.
The configuration can be fixed in several ways. If the control channel
is open, config-set with a valid configuration can be
used. Alternatively, the original config file on disk could be fixed
and SIGHUP signal could be sent (or the config-reload command
issued). Finally, the server could be restarted completely.

% DHCP4_CONFIG_UNSUPPORTED_OBJECT DHCPv4 server configuration includes an unsupported object: %1
This error message is issued when the configuration includes an unsupported
object (i.e. a top level element).

% DHCP4_CONFIG_UPDATE updated configuration received: %1
A debug message indicating that the DHCPv4 server has received an
updated configuration from the Kea configuration system.

% DHCP4_DB_RECONNECT_DISABLED database reconnect is disabled: max-reconnect-tries %1, reconnect-wait-time %2
This is an informational message indicating that connectivity to either the
lease or host database or both and that automatic reconnect is not enabled.

% DHCP4_DB_RECONNECT_FAILED maximum number of database reconnect attempts: %1, has been exhausted without success
This error indicates that the server failed to reconnect to the lease and/or
host database(s) after making the maximum configured number of reconnect
attempts. This might cause the server to shut down as specified in the
configuration. Loss of connectivity is typically a network or database server
issue.

% DHCP4_DB_RECONNECT_LOST_CONNECTION database connection lost.
This info message indicates that the connection has been lost and the dhcp
service might have been disabled, as specified in the configuration, in order to
try to recover the connection.

% DHCP4_DB_RECONNECT_NO_DB_CTL unexpected error in database reconnect
This is an error message indicating a programmatic error that should not
occur. It prohibits the server from attempting to reconnect to its
databases if connectivity is lost, and the server exits. This error
should be reported.

% DHCP4_DB_RECONNECT_SUCCEEDED database connection recovered.
This info message indicates that the connection has been recovered and the dhcp
service has been restored.

% DHCP4_DDNS_REQUEST_SEND_FAILED failed sending a request to kea-dhcp-ddns, error: %1,  ncr: %2
This error message indicates that DHCP4 server attempted to send a DDNS
update request to the DHCP-DDNS server.  This is most likely a configuration or
networking error.

% DHCP4_DEACTIVATE_INTERFACE deactivate interface %1
This message is printed when DHCPv4 server disables an interface from being
used to receive DHCPv4 traffic. Sockets on this interface will not be opened
by the Interface Manager until interface is enabled.

% DHCP4_DECLINE_FAIL %1: error on decline lease for address %2: %3
This error message indicates that the software failed to decline a
lease from the lease database due to an error during a database
operation. The first argument includes the client and the transaction
identification information. The second argument holds the IPv4 address
which decline was attempted. The last one contains the reason for
failure.

% DHCP4_DECLINE_LEASE Received DHCPDECLINE for addr %1 from client %2. The lease will be unavailable for %3 seconds.
This informational message is printed when a client received an address, but
discovered that it is being used by some other device and notified the server by
sending a DHCPDECLINE message. The server checked that this address really was
leased to the client and marked this address as unusable for a certain
amount of time. This message may indicate a misconfiguration in a network,
as there is either a buggy client or more likely a device that is using an
address that it is not supposed to. The server will fully recover from this
situation, but if the underlying problem of a misconfigured or rogue device
is not solved, this address may be declined again in the future.

% DHCP4_DECLINE_LEASE_MISMATCH Received DHCPDECLINE for addr %1 from client %2, but the data doesn't match: received hwaddr: %3, lease hwaddr: %4, received client-id: %5, lease client-id: %6
This informational message means that a client attempted to report his address
as declined (i.e. used by unknown entity). The server has information about
a lease for that address, but the client's hardware address or client identifier
does not match the server's stored information. The client's request will be ignored.

% DHCP4_DECLINE_LEASE_NOT_FOUND Received DHCPDECLINE for addr %1 from client %2, but no such lease found.
This warning message indicates that a client reported that his address was
detected as a duplicate (i.e. another device in the network is using this address).
However, the server does not have a record for this address. This may indicate
a client's error or a server's purged database.

% DHCP4_DEFERRED_OPTION_MISSING %1: cannot find deferred option code %2 in the query
This debug message is printed when a deferred option cannot be found in
the query.

% DHCP4_DEFERRED_OPTION_UNPACK_FAIL %1: An error unpacking the deferred option %2: %3
A debug message issued when deferred unpacking of an option failed, making it
to be left unpacked in the packet. The first argument is the option code,
the second the error.

% DHCP4_DEVELOPMENT_VERSION This software is a development branch of Kea. It is not recommended for production use.
This warning message is displayed when the version is a development
(vs stable) one: the second number of the version is odd.

% DHCP4_DHCP4O6_BAD_PACKET %1: received malformed DHCPv4o6 packet: %2
A malformed DHCPv4o6 packet was received.

% DHCP4_DHCP4O6_HOOK_SUBNET4_SELECT_DROP %1: packet was dropped, because a callout set the next step to 'drop'
This debug message is printed when a callout installed on the
subnet4_select hook point sets the next step to 'drop' value. For this particular hook
point, the setting to that value instructs the server to drop the received
packet. The argument specifies the client and transaction identification
information.

% DHCP4_DHCP4O6_HOOK_SUBNET4_SELECT_SKIP %1: no subnet was selected, because a callout set the next skip flag
This debug message is printed when a callout installed on the
subnet4_select hook point sets the next step to SKIP value. For this particular hook
point, the setting of the flag instructs the server not to choose a
subnet, an action that severely limits further processing; the server
will be only able to offer global options - no addresses will be assigned.
The argument specifies the client and transaction identification
information.

% DHCP4_DHCP4O6_PACKET_RECEIVED received DHCPv4o6 packet from DHCPv4 server (type %1) for %2 on interface %3
This debug message is printed when the server is receiving a DHCPv4o6
from the DHCPv4 server over inter-process communication.

% DHCP4_DHCP4O6_PACKET_SEND %1: trying to send packet %2 (type %3) to %4 port %5 on interface %6 encapsulating %7: %8 (type %9)
The arguments specify the client identification information (HW address
and client identifier), DHCPv6 message name and type, source IPv6
address and port, and interface name, DHCPv4 client identification,
message name and type.

% DHCP4_DHCP4O6_PACKET_SEND_FAIL %1: failed to send DHCPv4o6 packet: %2
This error is output if the IPv4 DHCP server fails to send an
DHCPv4o6 message to the IPv6 DHCP server. The reason for the
error is included in the message.

% DHCP4_DHCP4O6_RECEIVE_FAIL failed to receive DHCPv4o6: %1
This debug message indicates the inter-process communication with the
DHCPv6 server failed. The reason for the error is included in
the message.

% DHCP4_DHCP4O6_RECEIVING receiving DHCPv4o6 packet from DHCPv6 server
This debug message is printed when the server is receiving a DHCPv4o6
from the DHCPv6 server over inter-process communication socket.

% DHCP4_DHCP4O6_RESPONSE_DATA %1: responding with packet %2 (type %3), packet details: %4
A debug message including the detailed data about the packet being
sent to the DHCPv6 server to be forwarded to the client. The first
argument contains the client and the transaction identification
information. The second and third argument contains the packet name
and type respectively. The fourth argument contains detailed packet
information.

% DHCP4_DHCP4O6_SUBNET_DATA %1: the selected subnet details: %2
This debug message includes the details of the subnet selected for
the client. The first argument includes the client and the
transaction identification information. The second arguments
includes the subnet details.

% DHCP4_DHCP4O6_SUBNET_SELECTED %1: the subnet with ID %2 was selected for client assignments
This is a debug message noting the selection of a subnet to be used for
address and option assignment. Subnet selection is one of the early
steps in the processing of incoming client message. The first
argument includes the client and the transaction identification
information. The second argument holds the selected subnet id.

% DHCP4_DHCP4O6_SUBNET_SELECTION_FAILED %1: failed to select subnet for the client
This debug message indicates that the server failed to select the
subnet for the client which has sent a message to the server.
The server will not be able to offer any lease to the client and
will drop its message if the received message was DHCPDISCOVER,
and will send DHCPNAK if the received message was DHCPREQUEST.
The argument includes the client and the transaction identification
information.

% DHCP4_DISCOVER %1: server is processing DHCPDISCOVER with hint=%2
This is a debug message that indicates the processing of a received DHCPDISCOVER
message. The first argument contains the client and the transaction
identification information. The second argument may hold the hint for the server
about the address that the client would like to have allocated.
If there is no hint, the argument should provide the text indicating
that the hint hasn't been sent.

% DHCP4_DYNAMIC_RECONFIGURATION initiate server reconfiguration using file: %1, after receiving SIGHUP signal or config-reload command
This is the info message logged when the DHCPv4 server starts reconfiguration
as a result of receiving SIGHUP signal or config-reload command.

% DHCP4_DYNAMIC_RECONFIGURATION_FAIL dynamic server reconfiguration failed with file: %1
This is a fatal error message logged when the dynamic reconfiguration of the
DHCP server failed.

% DHCP4_DYNAMIC_RECONFIGURATION_SUCCESS dynamic server reconfiguration succeeded with file: %1
This is info message logged when the dynamic reconfiguration of the DHCP server
succeeded.

% DHCP4_EMPTY_HOSTNAME %1: received empty hostname from the client, skipping processing of this option
This debug message is issued when the server received an empty Hostname option
from a client. Server does not process empty Hostname options and therefore
option is skipped. The argument holds the client and transaction identification
information.

% DHCP4_FLEX_ID %1: flexible identifier generated for incoming packet: %2
This debug message is printed when host reservation type is set to flexible identifier
and the expression specified in its configuration generated (was evaluated to)
an identifier for incoming packet. This debug message is mainly intended as a
debugging assistance for flexible identifier.

% DHCP4_GENERATE_FQDN %1: client did not send a FQDN or hostname; FQDN will be generated for the client
This debug message is issued when the server did not receive a Hostname option
from the client and hostname generation is enabled.  This provides a means to
create DNS entries for unsophisticated clients.

% DHCP4_HANDLE_SIGNAL_EXCEPTION An exception was thrown while handing signal: %1
This error message is printed when an ISC or standard exception was raised during signal
processing. This likely indicates a coding error and should be reported to ISC.

% DHCP4_HOOK_BUFFER_RCVD_DROP received buffer from %1 to %2 over interface %3 was dropped because a callout set the drop flag
This debug message is printed when a callout installed on buffer4_receive
hook point set the drop flag. For this particular hook point, the
setting of the flag by a callout instructs the server to drop the packet.
The arguments specify the source and destination IPv4 address as well as
the name of the interface over which the buffer has been received.

% DHCP4_HOOK_BUFFER_RCVD_SKIP received buffer from %1 to %2 over interface %3 is not parsed because a callout set the next step to SKIP.
This debug message is printed when a callout installed on
buffer4_receive hook point set the next step to SKIP. For this particular hook
point, this value set by a callout instructs the server to
not parse the buffer because it was already parsed by the hook. The
arguments specify the source and destination IPv4 address as well as
the name of the interface over which the buffer has been received.

% DHCP4_HOOK_BUFFER_SEND_SKIP %1: prepared response is dropped because a callout set the next step to SKIP.
This debug message is printed when a callout installed on buffer4_send
hook point set the next step to SKIP. For this particular hook point, the
SKIP value set by a callout instructs the server to drop the packet.
Server completed all the processing (e.g. may have assigned, updated
or released leases), but the response will not be send to the client.

% DHCP4_HOOK_DDNS_UPDATE A hook has updated the DDNS parameters: hostname %1=>%2, forward update %3=>%4, reverse update %5=>%6
This message indicates that there was a hook called on ddns4_update hook point
and that hook updated the DDNS update parameters: hostname, or whether to
conduct forward (A record) or reverse (PTR record) DDNS updates.

% DHCP4_HOOK_DECLINE_SKIP Decline4 hook callouts set status to DROP, ignoring packet.
This message indicates that the server received DHCPDECLINE message, it was verified
to be correct and matching server's lease information. The server called hooks
for decline4 hook point and one of the callouts set next step status to DROP.
The server will now abort processing of the packet as if it was never
received. The lease will continue to be assigned to this client.

% DHCP4_HOOK_LEASE4_OFFER_ARGUMENT_MISSING hook callouts did not set an argument as expected %1 for %2
This error message is printed when none of the callouts installed on the
lease4_offer hook point set an expected argument in the callout status.
This is a programming error in the installed hook libraries.  Details of
the argument and the query in process at the time are provided log arguments.

% DHCP4_HOOK_LEASE4_OFFER_DROP %1: packet is dropped, because a callout set the next step to DROP
This debug message is printed when a callout installed on the lease4_offer
hook point sets the next step to DROP.

% DHCP4_HOOK_LEASE4_OFFER_PARK %1: packet is parked, because a callout set the next step to PARK
This debug message is printed when a callout installed on the lease4_offer
hook point sets the next step to PARK.

% DHCP4_HOOK_LEASE4_OFFER_PARKING_LOT_FULL The parked-packet-limit %1, has been reached, dropping query: %2
This debug message occurs when the parking lot used to hold client queries
while the hook library work for them completes has reached or exceeded the
limit set by the parked-packet-limit global parameter. This can occur when
kea-dhcp4 is using hook libraries (e.g. ping-check) that implement the
"lease4_offer" callout and client queries are arriving faster than
those callouts can fulfill them.

% DHCP4_HOOK_LEASE4_RELEASE_SKIP %1: lease was not released because a callout set the next step to SKIP
This debug message is printed when a callout installed on lease4_release
hook point set the next step status to SKIP. For this particular hook point, the
value set by a callout instructs the server to not release a lease.

% DHCP4_HOOK_LEASES4_COMMITTED_DROP %1: packet is dropped, because a callout set the next step to DROP
This debug message is printed when a callout installed on the leases4_committed
hook point sets the next step to DROP.

% DHCP4_HOOK_LEASES4_COMMITTED_PARK %1: packet is parked, because a callout set the next step to PARK
This debug message is printed when a callout installed on the leases4_committed
hook point sets the next step to PARK.

% DHCP4_HOOK_LEASES4_COMMITTED_PARKING_LOT_FULL The parked-packet-limit %1, has been reached, dropping query: %2
This debug message occurs when the parking lot used to hold client queries
while the hook library work for them completes has reached or exceeded the
limit set by the parked-packet-limit global parameter. This can occur when
kea-dhcp4 is using hook libraries (e.g. HA) that implement the
"leases4-committed" callout and client queries are arriving faster than
those callouts can fulfill them.

% DHCP4_HOOK_PACKET_RCVD_SKIP %1: packet is dropped, because a callout set the next step to SKIP
This debug message is printed when a callout installed on the pkt4_receive
hook point sets the next step to SKIP. For this particular hook point, the
value setting of the flag instructs the server to drop the packet.

% DHCP4_HOOK_PACKET_SEND_DROP %1: prepared DHCPv4 response was not sent because a callout set the next ste to DROP
This debug message is printed when a callout installed on the pkt4_send
hook point set the next step to DROP. For this particular hook point, the setting
of the value by a callout instructs the server to drop the packet. This
effectively means that the client will not get any response, even though
the server processed client's request and acted on it (e.g. possibly
allocated a lease). The argument specifies the client and transaction
identification information.

% DHCP4_HOOK_PACKET_SEND_SKIP %1: prepared response is not sent, because a callout set the next stp to SKIP
This debug message is printed when a callout installed on the pkt4_send
hook point sets the next step to SKIP. For this particular hook point, this
setting instructs the server to drop the packet. This means that
the client will not get any response, even though the server processed
client's request and acted on it (e.g. possibly allocated a lease).

% DHCP4_HOOK_SUBNET4_SELECT_4O6_PARKING_LOT_FULL The parked-packet-limit %1, has been reached, dropping query: %2
This debug message occurs when the parking lot used to hold client queries
while the hook library work for them completes has reached or exceeded the
limit set by the parked-packet-limit global parameter. This can occur when
kea-dhcp4 is using hook libraries (e.g. radius) that implement the
"subnet4_select" callout and DHCP4O6 client queries are arriving faster than
those callouts can fulfill them.

% DHCP4_HOOK_SUBNET4_SELECT_DROP %1: packet was dropped, because a callout set the next step to 'drop'
This debug message is printed when a callout installed on the
subnet4_select hook point sets the next step to 'drop' value. For this particular hook
point, the setting to that value instructs the server to drop the received
packet. The argument specifies the client and transaction identification
information.

% DHCP4_HOOK_SUBNET4_SELECT_PARK %1: packet was parked
This debug message is printed when a callout installed on the
subnet4_select hook point set the park flag. The argument holds the
client and transaction identification information.

% DHCP4_HOOK_SUBNET4_SELECT_PARKING_LOT_FULL The parked-packet-limit %1, has been reached, dropping query: %2
This debug message occurs when the parking lot used to hold client queries
while the hook library work for them completes has reached or exceeded the
limit set by the parked-packet-limit global parameter. This can occur when
kea-dhcp4 is using hook libraries (e.g. radius) that implement the
"subnet4_select" callout and client queries are arriving faster than
those callouts can fulfill them.

% DHCP4_HOOK_SUBNET4_SELECT_SKIP %1: no subnet was selected, because a callout set the next skip flag
This debug message is printed when a callout installed on the
subnet4_select hook point sets the next step to SKIP value. For this particular hook
point, the setting of the flag instructs the server not to choose a
subnet, an action that severely limits further processing; the server
will be only able to offer global options - no addresses will be assigned.
The argument specifies the client and transaction identification
information.

% DHCP4_INFORM_DIRECT_REPLY %1: DHCPACK in reply to the DHCPINFORM will be sent directly to %2 over %3
This debug message is issued when the DHCPACK will be sent directly to the
client, rather than via a relay. The first argument contains the client
and transaction identification information. The second argument contains
the client's IPv4 address to which the response will be sent. The third
argument contains the local interface name.

% DHCP4_INIT_FAIL failed to initialize Kea server: %1
The server has failed to initialize. This may be because the configuration
was not successful, or it encountered any other critical error on startup.
Attached error message provides more details about the issue.

% DHCP4_INIT_REBOOT %1: client is in INIT-REBOOT state and requests address %2
This informational message is issued when the client is in the INIT-REBOOT
state and is requesting an IPv4 address it is using to be allocated for it.
The first argument includes the client and transaction identification
information. The second argument specifies the requested IPv4 address.

% DHCP4_LEASE_ALLOC %1: lease %2 has been allocated for %3 seconds
This informational message indicates that the server successfully granted a
lease in response to client's DHCPREQUEST message. The lease information will
be sent to the client in the DHCPACK message. The first argument contains the
client and the transaction identification information. The second argument
contains the allocated IPv4 address. The third argument is the validity
lifetime.

% DHCP4_LEASE_OFFER %1: lease %2 will be offered
This informational message indicates that the server has found the lease to be
offered to the client. It is up to the client to choose one server out of
those which offered leases and continue allocation with that server.
The first argument specifies the client and the transaction identification
information. The second argument specifies the IPv4 address to be offered.

% DHCP4_LEASE_REUSE %1: lease %2 has been reused for %3 seconds
This informational message indicates that the server successfully reused a
lease in response to client's message. The lease information will
be sent to the client in the DHCPACK message. The first argument contains the
client and the transaction identification information. The second argument
contains the allocated IPv4 address. The third argument is the validity
lifetime.

% DHCP4_MULTI_THREADING_INFO enabled: %1, number of threads: %2, queue size: %3
This is a message listing some information about the multi-threading parameters
with which the server is running.

% DHCP4_NCR_CREATION_FAILED %1: failed to generate name change requests for DNS: %2
This message indicates that server was unable to generate NameChangeRequests
which should be sent to the kea-dhcp_ddns module to create
new DNS records for the lease being acquired or to update existing records
for the renewed lease. The first argument contains the client and transaction
identification information. The second argument includes the reason for the
failure.

% DHCP4_NOT_RUNNING DHCPv4 server is not running
A warning message is issued when an attempt is made to shut down the
DHCPv4 server but it is not running.

% DHCP4_NO_LEASE_INIT_REBOOT %1: no lease for address %2 requested by INIT-REBOOT client
This debug message is issued when the client being in the INIT-REBOOT state
requested an IPv4 address but this client is unknown. The server will not
respond. The first argument includes the client and the transaction id
identification information. The second argument includes the IPv4 address
requested by the client.

% DHCP4_NO_SOCKETS_OPEN no interface configured to listen to DHCP traffic
This warning message is issued when current server configuration specifies
no interfaces that server should listen on, or specified interfaces are not
configured to receive the traffic.

% DHCP4_OPEN_CONFIG_DB Opening configuration database: %1
This message is printed when the DHCPv4 server is attempting to open a
configuration database.  The database access string with password redacted
is logged.

% DHCP4_OPEN_SOCKET opening service sockets on port %1
A debug message issued during startup, this indicates that the DHCPv4
server is about to open sockets on the specified port.

% DHCP4_OPEN_SOCKETS_FAILED maximum number of open service sockets attempts: %1, has been exhausted without success
This error indicates that the server failed to bind service sockets after making
the maximum configured number of reconnect attempts. This might cause the server
to shut down as specified in the configuration.

% DHCP4_OPEN_SOCKETS_NO_RECONNECT_CTL unexpected error in bind service sockets.
This is an error message indicating a programmatic error that should not occur.
It prohibits the server from attempting to bind to its service sockets if they
are unavailable, and the server exits. This error should be reported.

% DHCP4_OPEN_SOCKET_FAIL failed to open socket: %1
A warning message issued when IfaceMgr fails to open and bind a socket. The reason
for the failure is appended as an argument of the log message.

% DHCP4_PACKET_DROP_0001 %1: failed to parse packet from %2 to %3, received over interface %4, reason: %5, %6
The DHCPv4 server has received a packet that it is unable to
interpret. The reason why the packet is invalid is included in the message.

% DHCP4_PACKET_DROP_0002 %1, from interface %2: no suitable subnet configured for a direct client
This info message is logged when received a message from a directly connected
client but there is no suitable subnet configured for the interface on
which this message has been received. The IPv4 address assigned on this
interface must belong to one of the configured subnets. Otherwise
received message is dropped.

% DHCP4_PACKET_DROP_0003 %1, from interface %2: it contains a foreign server identifier
This debug message is issued when received DHCPv4 message is dropped because
it is addressed to a different server, i.e. a server identifier held by
this message doesn't match the identifier used by our server. The arguments
of this message hold the name of the transaction id and interface on which
the message has been received.

% DHCP4_PACKET_DROP_0004 %1, from interface %2: missing msg-type option
This is a debug message informing that incoming DHCPv4 packet did not
have mandatory DHCP message type option and thus was dropped. The
arguments specify the client and transaction identification information,
as well as the interface on which the message has been received.

% DHCP4_PACKET_DROP_0005 %1: unrecognized type %2 in option 53
This debug message indicates that the message type carried in DHCPv4 option
53 is unrecognized by the server. The valid message types are listed
on the IANA website: http://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#message-type-53.
The message will not be processed by the server. The arguments specify
the client and transaction identification information, as well as the
received message type.

% DHCP4_PACKET_DROP_0006 %1: unsupported DHCPv4 message type %2
This debug message indicates that the message type carried in DHCPv4 option
53 is valid but the message will not be processed by the server. This includes
messages being normally sent by the server to the client, such as DHCPOFFER,
DHCPACK, DHCPNAK etc. The first argument specifies the client and transaction
identification information. The second argument specifies the message type.

% DHCP4_PACKET_DROP_0007 %1: failed to process packet: %2
This is a general catch-all message indicating that the processing of a
received packet failed.  The reason is given in the message.  The server
will not send a response but will instead ignore the packet. The first
argument contains the client and transaction identification information.
The second argument includes the details of the error.

% DHCP4_PACKET_DROP_0008 %1: DHCP service is globally disabled
This debug message is issued when a packet is dropped because the DHCP service
has been temporarily disabled. This affects all received DHCP packets. The
service may be enabled by the "dhcp-enable" control command or automatically
after a specified amount of time since receiving "dhcp-disable" command.

% DHCP4_PACKET_DROP_0009 %1: Option 53 missing (no DHCP message type), is this a BOOTP packet?
This debug message is issued when a packet is dropped because it did contain
option 53 and thus has no DHCP message type. The most likely explanation is
that it was BOOTP packet.

% DHCP4_PACKET_DROP_0010 dropped as member of the special class 'DROP': %1, %2
This debug message is emitted when an incoming packet was classified
into the special class 'DROP' and dropped. The packet details are displayed.

% DHCP4_PACKET_DROP_0011 dropped as sent by the same client than a packet being processed by another thread: dropped %1, %2 by thread %3 as duplicate of %4, %5 processed by %6
Currently multi-threading processing avoids races between packets sent by
a client using the same client id option by dropping new packets until
processing is finished.
Packet details and thread identifiers are included for both packets in
this warning message.

% DHCP4_PACKET_DROP_0012 dropped as sent by the same client than a packet being processed by another thread: dropped %1, %2 by thread %3 as duplicate of %4, %5 processed by %6
Currently multi-threading processing avoids races between packets sent by
a client using the same hardware address by dropping new packets until
processing is finished.
Packet details and thread identifiers are included for both packets in
this warning message.

% DHCP4_PACKET_DROP_0013 dropped as member of the special class 'DROP' after host reservation lookup: %1, %2
This debug message is emitted when an incoming packet was classified
after host reservation lookup into the special class 'DROP' and dropped.
The packet details are displayed.

% DHCP4_PACKET_DROP_0014 dropped as member of the special class 'DROP' after early global host reservations lookup: %1, %2
This debug message is emitted when an incoming packet was classified
after early global host reservations lookup into the special class 'DROP'
and dropped. The packet details are displayed.

% DHCP4_PACKET_NAK_0001 %1: failed to select a subnet for incoming packet, src %2, type %3
This error message is output when a packet was received from a subnet
for which the DHCPv4 server has not been configured. The most probable
cause is a misconfiguration of the server. The first argument contains
the client and transaction identification information. The second argument
contains the source IPv4 address of the packet. The third argument contains
the name of the received packet.

% DHCP4_PACKET_NAK_0002 %1: invalid address %2 requested by INIT-REBOOT
This debug message is issued when the client being in the INIT-REBOOT state
requested an IPv4 address which is not assigned to him. The server will respond
to this client with DHCPNAK. The first argument contains the client and
the transaction identification information. The second arguments holds the
IPv4 address requested by the client.

% DHCP4_PACKET_NAK_0003 %1: failed to advertise a lease, client sent ciaddr %2, requested-ip-address %3
This message indicates that the server has failed to offer a lease to
the specified client after receiving a DISCOVER message from it. There are
many possible reasons for such a failure. The first argument contains
the client and the transaction identification information. The second
argument contains the IPv4 address in the ciaddr field. The third
argument contains the IPv4 address in the requested-ip-address option
(if present).

% DHCP4_PACKET_NAK_0004 %1: failed to grant a lease, client sent ciaddr %2, requested-ip-address %3
This message indicates that the server failed to grant a lease to the
specified client after receiving a REQUEST message from it.  There are many
possible reasons for such a failure. Additional messages will indicate the
reason. The first argument contains the client and the transaction
identification information. The second argument contains the IPv4 address
in the ciaddr field. The third argument contains the IPv4 address in the
requested-ip-address option (if present).

% DHCP4_PACKET_OPTIONS_SKIPPED %1: An error unpacking an option, caused subsequent options to be skipped: %2
A debug message issued when an option failed to unpack correctly, making it
impossible to unpack the remaining options in the packet.  The server will
server will still attempt to service the packet.

% DHCP4_PACKET_OPTION_UNPACK_FAIL An error unpacking the option %1: %2
A debug message issued when an option failed to unpack correctly, making it
to be left unpacked in the packet. The first argument is the option code,
the second the error.

% DHCP4_PACKET_PACK %1: preparing on-wire format of the packet to be sent
This debug message is issued when the server starts preparing the on-wire
format of the packet to be sent back to the client. The argument specifies
the client and the transaction identification information.

% DHCP4_PACKET_PACK_FAIL %1: preparing on-wire-format of the packet to be sent failed %2
This error message is issued when preparing an on-wire format of the packet
has failed. The first argument identifies the client and the DHCP transaction.
The second argument includes the error string.

% DHCP4_PACKET_PROCESS_EXCEPTION %1: exception occurred during packet processing
This error message indicates that a non-standard exception was raised
during packet processing that was not caught by other, more specific
exception handlers. This packet will be dropped and the server will
continue operation.

% DHCP4_PACKET_PROCESS_EXCEPTION_MAIN exception occurred during packet processing
This error message indicates that a non-standard exception was raised
during packet processing that was not caught by other, more specific
exception handlers. This packet will be dropped and the server will
continue operation. This error message may appear in main server processing
loop.

% DHCP4_PACKET_PROCESS_STD_EXCEPTION %1: exception occurred during packet processing: %2
This error message indicates that a standard exception was raised
during packet processing that was not caught by other, more specific
exception handlers. This packet will be dropped and the server will
continue operation.

% DHCP4_PACKET_PROCESS_STD_EXCEPTION_MAIN exception occurred during packet processing: %1
This error message indicates that a standard exception was raised
during packet processing that was not caught by other, more specific
exception handlers. This packet will be dropped and the server will
continue operation. This error message may appear in main server processing
loop.

% DHCP4_PACKET_QUEUE_FULL multi-threading packet queue is full
A debug message noting that the multi-threading packet queue is full so
the oldest packet of the queue was dropped to make room for the received one.

% DHCP4_PACKET_RECEIVED %1: %2 (type %3) received from %4 to %5 on interface %6
An INFO message noting that the server has received the specified type of
packet on the specified interface. The first argument specifies the
client and transaction identification information. The second and third
argument specify the name of the DHCPv4 message and its numeric type
respectively. The remaining arguments specify the source IPv4 address,
destination IPv4 address and the name of the interface on which the
message has been received.

% DHCP4_PACKET_SEND %1: trying to send packet %2 (type %3) from %4:%5 to %6:%7 on interface %8
An INFO message noting that the server is attempting to send the specified
type of packet.  The arguments specify the client identification information
(HW address and client identifier), DHCP message name and type, source IPv4
address and port, destination IPv4 address and port and the interface name.

This debug message is issued when the server is trying to send the
response to the client. When the server is using an UDP socket
to send the packet there are cases when this operation may be
unsuccessful and no error message will be displayed. One such situation
occurs when the server is unicasting the response to the 'ciaddr' of
a DHCPINFORM message. This often requires broadcasting an ARP
message to obtain the link layer address of the unicast destination.
If broadcast ARP messages are blocked in the network, according to
the firewall policy, the ARP message will not cause a response.
Consequently, the response to the DHCPINFORM will not be sent.
Since the ARP communication is under the OS control, Kea is not
notified about the drop of the packet which it is trying to send
and it has no means to display an error message.

% DHCP4_PACKET_SEND_FAIL %1: failed to send DHCPv4 packet: %2
This error is output if the DHCPv4 server fails to send an assembled
DHCP message to a client. The first argument includes the client and
the transaction identification information. The second argument includes
the reason for failure.

% DHCP4_PARSER_COMMIT_EXCEPTION parser failed to commit changes
On receipt of message containing details to a change of the DHCPv4
server configuration, a set of parsers were successfully created, but one
of them failed to commit its changes due to a low-level system exception
being raised.  Additional messages may be output indicating the reason.

% DHCP4_PARSER_COMMIT_FAIL parser failed to commit changes: %1
On receipt of message containing details to a change of the DHCPv4
server configuration, a set of parsers were successfully created, but
one of them failed to commit its changes.  The reason for the failure
is given in the message.

% DHCP4_PARSER_EXCEPTION failed to create or run parser for configuration element %1
On receipt of message containing details to a change of its configuration,
the DHCPv4 server failed to create a parser to decode the contents of
the named configuration element, or the creation succeeded but the parsing
actions and committal of changes failed.  The message has been output in
response to a non-Kea exception being raised.  Additional messages
may give further information.

% DHCP4_PARSER_FAIL failed to create or run parser for configuration element %1: %2
On receipt of message containing details to a change of its configuration,
the DHCPv4 server failed to create a parser to decode the contents
of the named configuration element, or the creation succeeded but the
parsing actions and committal of changes failed.  The reason for the
failure is given in the message.

% DHCP4_POST_ALLOCATION_NAME_UPDATE_FAIL %1: failed to update hostname %2 in a lease after address allocation: %3
This message indicates the failure when trying to update the lease and/or
options in the server's response with the hostname generated by the server
or reserved for the client belonging to a shared network. The latter is
the case when the server dynamically switches to another subnet (than
initially selected for allocation) from the same shared network.

% DHCP4_QUERY_DATA %1, packet details: %2
A debug message printing the details of the received packet. The first
argument includes the client and the transaction identification
information.

% DHCP4_QUERY_LABEL received query: %1
This information message indicates that a query was received. It displays
the client and the transaction identification information.

% DHCP4_RECLAIM_EXPIRED_LEASES_FAIL failed to reclaim expired leases: %1
This error message indicates that the reclaim expired leases operation failed
and provides the cause of failure.

% DHCP4_RECOVERED_STASHED_RELAY_AGENT_INFO recovered for query %1 relay agent option from lease %2: %3
This debug message indicates that agent options were stashed in the lease for
the client address of the request and were recovered. The first argument
includes the request information, the second the client address and the last
argument the content of the dhcp-agent-options option.

% DHCP4_RELEASE %1: address %2 was released properly.
This informational message indicates that an address was released properly. It
is a normal operation during client shutdown. The first argument includes
the client and transaction identification information. The second argument
includes the released IPv4 address.

% DHCP4_RELEASE_DELETED %1: address %2 was deleted on release.
This informational message indicates that an address was deleted on release. It
is a normal operation during client shutdown. The first argument includes the
client and transaction identification information. The second argument includes
the released IPv4 address.

% DHCP4_RELEASE_EXCEPTION %1: while trying to release address %2 an exception occurred: %3
This message is output when an error was encountered during an attempt
to process a DHCPRELEASE message. The error will not affect the client,
which does not expect any response from the server for DHCPRELEASE
messages. Depending on the nature of problem, it may affect future
server operation. The first argument includes the client and the
transaction identification information. The second argument
includes the IPv4 address which release was attempted. The last
argument includes the detailed error description.

% DHCP4_RELEASE_EXPIRED %1: address %2 expired on release.
This informational message indicates that an address expired on release. It is
a normal operation during client shutdown. The first argument includes the
client and transaction identification information. The second argument includes
the released IPv4 address.

% DHCP4_RELEASE_FAIL %1: failed to remove lease for address %2
This error message indicates that the software failed to remove a
lease from the lease database. It is probably due to an error during a
database operation: resolution will most likely require administrator
intervention (e.g. check if DHCP process has sufficient privileges to
update the database). It may also be triggered if a lease was manually
removed from the database during RELEASE message processing. The
first argument includes the client and the transaction identification
information. The second argument holds the IPv4 address which release
was attempted.

% DHCP4_RELEASE_FAIL_NO_LEASE %1: client is trying to release non-existing lease %2
This debug message is printed when client attempts to release a lease,
but no such lease is known to the server. The first argument contains
the client and transaction identification information. The second
argument contains the IPv4 address which the client is trying to
release.

% DHCP4_RELEASE_FAIL_WRONG_CLIENT %1: client is trying to release the lease %2 which belongs to a different client
This debug message is issued when a client is trying to release the
lease for the address which is currently used by another client, i.e.
the 'client identifier' or 'chaddr' doesn't match between the client
and the lease. The first argument includes the client and the
transaction identification information. The second argument specifies
the leased address.

% DHCP4_REQUEST %1: server is processing DHCPREQUEST with hint=%2
This is a debug message that indicates the processing of a received DHCPREQUEST
message. The first argument contains the client and the transaction
identification information. The second argument may hold the hint for the server
about the address that the client would like to have allocated.
If there is no hint, the argument should provide the text indicating
that the hint hasn't been sent.

% DHCP4_RESERVATIONS_LOOKUP_FIRST_ENABLED Multi-threading is enabled and host reservations lookup is always performed first.
This is a message informing that host reservations lookup is performed before
lease lookup when multi-threading is enabled overwriting configured value.

% DHCP4_RESERVED_HOSTNAME_ASSIGNED %1: server assigned reserved hostname %2
This debug message is issued when the server found a hostname reservation
for a client and uses this reservation in a hostname option sent back
to this client. The reserved hostname is qualified with a value
of 'ddns-qualifying-suffix' parameter, if this parameter is specified.

% DHCP4_RESPONSE_DATA %1: responding with packet %2 (type %3), packet details: %4
A debug message including the detailed data about the packet being sent
to the client. The first argument contains the client and the transaction
identification information. The second and third argument contains the
packet name and type respectively. The fourth argument contains detailed
packet information.

% DHCP4_RESPONSE_FQDN_DATA %1: including FQDN option in the server's response: %2
This debug message is issued when the server is adding the Client FQDN
option in its response to the client. The first argument includes the
client and transaction identification information. The second argument
includes the details of the FQDN option being included. Note that the
name carried in the FQDN option may be modified by the server when
the lease is acquired for the client.

% DHCP4_RESPONSE_HOSTNAME_DATA %1: including Hostname option in the server's response: %2
This debug message is issued when the server is adding the Hostname
option in its response to the client. The first argument includes the
client and transaction identification information. The second argument
includes the details of the FQDN option being included. Note that the
name carried in the Hostname option may be modified by the server when
the lease is acquired for the client.

% DHCP4_RESPONSE_HOSTNAME_GENERATE %1: server has generated hostname %2 for the client
This debug message includes the auto-generated hostname which will be used
for the client which message is processed. Hostnames may need to be generated
when required by the server's configuration or when the client hasn't
supplied its hostname. The first argument includes the client and the
transaction identification information. The second argument holds the
generated hostname.

% DHCP4_SERVER_FAILED server failed: %1
The DHCPv4 server has encountered a fatal error and is terminating.
The reason for the failure is included in the message.

% DHCP4_SERVER_INITIATED_DECLINE %1: Lease for addr %2 has been found to be already in use. The lease will be unavailable for %3 seconds.
This informational message is printed when the server has detected via
ICMP ECHO (i.e. ping check) or other means that a lease which should be
free to offer is actually in use. This message may indicate a misconfiguration
in a network or more likely a device that is using an address that it is not
supposed to use. The server will fully recover from this situation, but if
the underlying problem of a misconfigured or rogue device is not solved, this
address may be declined again in the future.

% DHCP4_SERVER_INITIATED_DECLINE_ADD_FAILED %1: error adding a lease for address %2
This error message indicates that the server failed to add a DECLINED lease to
the lease store. The first argument includes the client and the transaction
identification information. The second argument holds the IPv4 address for which
the decline was attempted.

% DHCP4_SERVER_INITIATED_DECLINE_FAILED %1: error on server-initiated decline lease for address %2: %3
This error message indicates that the software failed to decline a
lease from the lease database due to an error during a database
operation. The first argument includes the client and the transaction
identification information. The second argument holds the IPv4 address
for which the decline was attempted. The last one contains the reason of
failure.

% DHCP4_SERVER_INITIATED_DECLINE_RESOURCE_BUSY %1: error declining a lease for address %2
This error message indicates that while one server thread was attempting to mark
a lease as DECLINED, it was already locked by another thread. The first argument
includes the client and the transaction identification information.  The second
argument holds the IPv4 address for which the decline was attempted.

% DHCP4_SERVER_INITIATED_DECLINE_UPDATE_FAILED %1: error updating lease for address %2
This error message indicates that the server failed to update a lease in the
lease store to the DECLINED state. The first argument includes the client and
the transaction identification information. The second argument holds the IPv4
address for which the decline was attempted.

% DHCP4_SHUTDOWN server shutdown
The DHCPv4 server has terminated normally.

% DHCP4_SHUTDOWN_REQUEST shutdown of server requested
This debug message indicates that a shutdown of the DHCPv4 server has
been requested via a call to the 'shutdown' method of the core Dhcpv4Srv
object.

% DHCP4_SRV_CONSTRUCT_ERROR error creating Dhcpv4Srv object, reason: %1
This error message indicates that during startup, the construction of a
core component within the DHCPv4 server (the Dhcpv4 server object)
has failed.  As a result, the server will exit.  The reason for the
failure is given within the message.

% DHCP4_SRV_D2STOP_ERROR error stopping IO with DHCP_DDNS during shutdown: %1
This error message indicates that during shutdown, an error occurred while
stopping IO between the DHCPv4 server and the DHCP_DDNS server.  This is
probably due to a programmatic error is not likely to impact either server
upon restart.  The reason for the failure is given within the message.

% DHCP4_SRV_DHCP4O6_ERROR error stopping IO with DHCPv4o6 during shutdown: %1
This error message indicates that during shutdown, an error occurred while
stopping IO between the DHCPv4 server and the DHCPv4o6 server.  This is
probably due to a programmatic error is not likely to impact either server
upon restart.  The reason for the failure is given within the message.

% DHCP4_SRV_UNLOAD_LIBRARIES_ERROR error unloading hooks libraries during shutdown: %1
This error message indicates that during shutdown, unloading hooks
libraries failed to close them. If the list of libraries is empty it is
a programmatic error in the server code. If it is not empty it could be
a programmatic error in one of the hooks libraries which could lead to
a crash during finalization.

% DHCP4_STARTED Kea DHCPv4 server version %1 started
This informational message indicates that the DHCPv4 server has
processed all configuration information and is ready to process
DHCPv4 packets.  The version is also printed.

% DHCP4_STARTING Kea DHCPv4 server version %1 (%2) starting
This informational message indicates that the DHCPv4 server has
processed any command-line switches and is starting. The version
is also printed.

% DHCP4_START_INFO pid: %1, server port: %2, client port: %3, verbose: %4
This is a debug message issued during the DHCPv4 server startup.
It lists some information about the parameters with which the server
is running.

% DHCP4_SUBNET_DATA %1: the selected subnet details: %2
This debug message includes the details of the subnet selected for
the client. The first argument includes the client and the
transaction identification information. The second arguments
includes the subnet details.

% DHCP4_SUBNET_DYNAMICALLY_CHANGED %1: changed selected subnet %2 to subnet %3 from shared network %4 for client assignments
This debug message indicates that the server is using another subnet
than initially selected for client assignments. This newly selected
subnet belongs to the same shared network as the original subnet.
Some reasons why the new subnet was selected include: address pool
exhaustion in the original subnet or the fact that the new subnet
includes some static reservations for this client.

% DHCP4_SUBNET_SELECTED %1: the subnet with ID %2 was selected for client assignments
This is a debug message noting the selection of a subnet to be used for
address and option assignment. Subnet selection is one of the early
steps in the processing of incoming client message. The first
argument includes the client and the transaction identification
information. The second argument holds the selected subnet id.

% DHCP4_SUBNET_SELECTION_FAILED %1: failed to select subnet for the client
This debug message indicates that the server failed to select the
subnet for the client which has sent a message to the server.
The server will not be able to offer any lease to the client and
will drop its message if the received message was DHCPDISCOVER,
and will send DHCPNAK if the received message was DHCPREQUEST.
The argument includes the client and the transaction identification
information.

% DHCP4_TESTING_MODE_SEND_TO_SOURCE_ENABLED All packets will be send to source address of an incoming packet - use only for testing
This message is printed then KEA_TEST_SEND_RESPONSES_TO_SOURCE
environment variable is set. It's causing Kea to send packets to
source address of incoming packet. Usable just in testing environment
to simulate multiple subnet traffic from single source.

% DHCP4_UNKNOWN_ADDRESS_REQUESTED %1: client requested an unknown address, client sent ciaddr %2, requested-ip-address %3
This message indicates that the client requested an address that does
not belong to any dynamic pools managed by this server.  The first argument
contains the client and the transaction identification information.
The second argument contains the IPv4 address in the ciaddr field. The
third argument contains the IPv4 address in the requested-ip-address
option (if present).