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   systemd.network    ( 5 )

конфигурация сети (Network configuration)
  Name  |  Synopsis  |  Description  |  Match section options  |  [link] section options  |  [sr-iov] section options  |  Network section options  |  [address] section options  |  [neighbor] section options  |  [ipv6addresslabel] section options  |  [routingpolicyrule] section options  |  [nexthop] section options  |  [route] section options  |  Dhcpv4 section options  |  Dhcpv6 section options  |  [dhcpv6prefixdelegation] section options  |  [ipv6acceptra] section options  |  [dhcpserver] section options  |  [dhcpserverstaticlease] section options  |  [ipv6sendra] section options  |  [ipv6prefix] section options  |  [ipv6routeprefix] section options  |  [bridge] section options  |  [bridgefdb] section options  |  [bridgemdb] section options  |  [lldp] section options  |    [can] section options    |  [qdisc] section options  |  [networkemulator] section options  |  [tokenbucketfilter] section options  |  [pie] section options  |  [flowqueuepie] section options  |  [stochasticfairblue] section options  |  [stochasticfairnessqueueing] section options  |  [bfifo] section options  |  [pfifo] section options  |  [pfifoheaddrop] section options  |  [pfifofast] section options  |  [cake] section options  |  [controlleddelay] section options  |  [deficitroundrobinscheduler] section options  |  [deficitroundrobinschedulerclass] section options  |  [enhancedtransmissionselection] section options  |  [genericrandomearlydetection] section options  |  [fairqueueingcontrolleddelay] section options  |  [fairqueueing] section options  |  [triviallinkequalizer] section options  |  [hierarchytokenbucket] section options  |  [hierarchytokenbucketclass] section options  |  [heavyhitterfilter] section options  |  [quickfairqueueing] section options  |  [quickfairqueueingclass] section options  |  [bridgevlan] section options  |  Examples  |  See also  |  Note  |

[CAN] SECTION OPTIONS

The [CAN] section manages the Controller Area Network (CAN bus) and accepts the following keys:

BitRate= The bitrate of CAN device in bits per second. The usual SI prefixes (K, M) with the base of 1000 can be used here. Takes a number in the range 1...4294967295.

SamplePoint= Optional sample point in percent with one decimal (e.g. "75%", "87.5%") or permille (e.g. "875‰"). This will be ignored when BitRate= is unspecified.

TimeQuantaNSec=, PropagationSegment=, PhaseBufferSegment1=, PhaseBufferSegment2=, SyncJumpWidth= Specifies the time quanta, propagation segment, phase buffer segment 1 and 2, and the synchronization jump width, which allow to define the CAN bit-timing in a hardware independent format as proposed by the Bosch CAN 2.0 Specification. TimeQuantaNSec= takes a timespan in nanoseconds. PropagationSegment=, PhaseBufferSegment1=, PhaseBufferSegment2=, and SyncJumpWidth= take number of time quantum specified in TimeQuantaNSec= and must be an unsigned integer in the range 0...4294967295. These settings except for SyncJumpWidth= will be ignored when BitRate= is specified.

DataBitRate=, DataSamplePoint= The bitrate and sample point for the data phase, if CAN-FD is used. These settings are analogous to the BitRate= and SamplePoint= keys.

DataTimeQuantaNSec=, DataPropagationSegment=, DataPhaseBufferSegment1=, DataPhaseBufferSegment2=, DataSyncJumpWidth= Specifies the time quanta, propagation segment, phase buffer segment 1 and 2, and the synchronization jump width for the data phase, if CAN-FD is used. These settings are analogous to the TimeQuantaNSec= or related settings.

FDMode= Takes a boolean. When "yes", CAN-FD mode is enabled for the interface. Note, that a bitrate and optional sample point should also be set for the CAN-FD data phase using the DataBitRate= and DataSamplePoint= keys, or DataTimeQuanta= and related settings.

FDNonISO= Takes a boolean. When "yes", non-ISO CAN-FD mode is enabled for the interface. When unset, the kernel's default will be used.

RestartSec= Automatic restart delay time. If set to a non-zero value, a restart of the CAN controller will be triggered automatically in case of a bus-off condition after the specified delay time. Subsecond delays can be specified using decimals (e.g. "0.1s") or a "ms" or "us" postfix. Using "infinity" or "0" will turn the automatic restart off. By default automatic restart is disabled.

Termination= Takes a boolean or a termination resistor value in ohm in the range 0–65535. When "yes", the termination resistor is set to 120 ohm. When "no" or "0" is set, the termination resistor is disabled. When unset, the kernel's default will be used.

TripleSampling= Takes a boolean. When "yes", three samples (instead of one) are used to determine the value of a received bit by majority rule. When unset, the kernel's default will be used.

BusErrorReporting= Takes a boolean. When "yes", reporting of CAN bus errors is activated (those include single bit, frame format, and bit stuffing errors, unable to send dominant bit, unable to send recessive bit, bus overload, active error announcement, error occurred on transmission). When unset, the kernel's default will be used. Note: in case of a CAN bus with a single CAN device, sending a CAN frame may result in a huge number of CAN bus errors.

ListenOnly= Takes a boolean. When "yes", listen-only mode is enabled. When the interface is in listen-only mode, the interface neither transmit CAN frames nor send ACK bit. Listen-only mode is important to debug CAN networks without interfering with the communication or acknowledge the CAN frame. When unset, the kernel's default will be used.

Loopback= Takes a boolean. When "yes", loopback mode is enabled. When the loopback mode is enabled, the interface treats messages transmitted by itself as received messages. The loopback mode is important to debug CAN networks. When unset, the kernel's default will be used.

OneShot= Takes a boolean. When "yes", one-shot mode is enabled. When unset, the kernel's default will be used.

PresumeAck= Takes a boolean. When "yes", the interface will ignore missing CAN ACKs. When unset, the kernel's default will be used.

ClassicDataLengthCode= Takes a boolean. When "yes", the interface will handle the 4bit data length code (DLC). When unset, the kernel's default will be used.