Section 8: administration and privileged commands
gate – Stream Gate Action Synopsis tc … action gate [ base-time BASETIME ] [ clockid CLOCKID ] sched-entry <gate state> <interval 1> [ <internal priority> <max octets> ] sched-entry <gate state> <interval 2> [ <internal priority> <max octets> ] sched-entry <gate state> <interval 3> [ <internal priority> <max octets> ]…
fw – fwmark traffic control filter Synopsis tc filter … fw [ classid CLASSID ] [ action ACTION_SPEC ] Description the fw filter allows to classify packets based on a previously set fwmark by iptables. If it is identical to the filter’s handle, the filter matches. iptables allows to mark single packets with the MARK…
FQ-PIE – Flow Queue Proportional Integral controller Enhanced Synopsis tc qdisc … fq_pie [ limit PACKETS ] [ flows NUMBER ] [ target TIME ] [ tupdate TIME ] [ alpha NUMBER ] [ beta NUMBER ] [ quantum BYTES ] [ memory_limit BYTES ] [ ecn_prob PERENTAGE ] [ [no]ecn ] [ [no]bytemode ] [ [no_]dq_rate_estimator ] Description FQ-PIE (Flow Queuing with Proportional Integral controller Enhanced) is a queuing discipline that combines Flow Queuing with the PIE AQM scheme. FQ-PIE uses a Jenkins hash function to…
CoDel – Fair Queuing (FQ) with Controlled Delay (CoDel) Synopsis tc qdisc … fq_codel [ limit PACKETS ] [ flows NUMBER ] [ target TIME ] [ interval TIME ] [ quantum BYTES ] [ ecn | noecn ] [ ce_threshold TIME ] [ memory_limit BYTES ] Description FQ_Codel (Fair Queuing Controlled Delay) is queuing…
FQ – Fair Queue traffic policing Synopsis tc qdisc … fq [ limit PACKETS ] [ flow_limit PACKETS ] [ quantum BYTES ] [ initial_quantum BYTES ] [ maxrate RATE ] [ buckets NUMBER ] [ orphan_mask NUMBER ] [ pacing | nopacing ] [ ce_threshold TIME ] Description FQ (Fair Queue) is a classless…
flower – flow based traffic control filter Synopsis tc filter … flower [ MATCH_LIST ] [ action ACTION_SPEC ] [ classid CLASSID ] [ hw_tc TCID ] MATCH_LIST := [ MATCH_LIST ] MATCH MATCH := { indev ifname | verbose | skip_sw | skip_hw | { dst_mac | src_mac } MASKED_LLADDR | vlan_id VID |…
flow – flow based traffic control filter Synopsis Mapping mode: tc filter … flow map key KEY [ OPS ] [ OPTIONS ] Hashing mode: tc filter … flow hash keys KEY_LIST [ perturb secs ] [ OPTIONS ] OPS := [ OPS ] OP OPTIONS := [ divisor NUM ] [ baseclass ID ]…
ETS – Enhanced Transmission Selection scheduler Synopsis tc qdisc … ets [ bands number ] [ strict number ] [ quanta bytes bytes bytes… ] [ priomap band band band… ] tc class … ets [ quantum bytes ] Description The Enhanced Transmission Selection scheduler is a classful queuing discipline that merges functionality of PRIO…
ETF – Earliest TxTime First (ETF) Qdisc Synopsis tc qdisc … dev dev parent classid [ handle major: ] etf clockid clockid [ delta delta_nsecs ] [ deadline_mode ] [ offload ] Description The ETF (Earliest TxTime First) qdisc allows applications to control the instant when a packet should be dequeued from the traffic control…
ematch – extended matches for use with "basic", "cgroup" or "flow" filters Synopsis tc filter add .. basic match EXPR .. flowid .. EXPR := TERM [ { and | or } EXPR ] TERM := [ not ] { MATCH | ‘(‘ EXPR ‘)’ } MATCH := module ‘(‘ ARGS ‘)’ ARGS := ARG1…
drr – deficit round robin scheduler Synopsis tc qdisc … add drr [ quantum bytes ] Description The Deficit Round Robin Scheduler is a classful queuing discipline as a more flexible replacement for Stochastic Fairness Queuing. Unlike SFQ, there are no built-in queues — you need to add classes and then set up filters to…
ctinfo – tc connmark processing action Synopsis tc … action ctinfo [ dscp MASK [STATEMASK] ] [ cpmark [MASK] ] [ zone ZONE ] [ CONTROL ] [ index <INDEX> ] Description CTINFO (Conntrack Information) is a tc action for retrieving data from conntrack marks into various fields. At present it has two independent processing…
ct – tc connection tracking action Synopsis tc … action ct commit [ force ] [ zone ZONE ] [ mark MASKED_MARK ] [ label MASKED_LABEL ] [ nat NAT_SPEC ] tc … action ct [ nat ] [ zone ZONE ] tc … action ct clear Description The ct action is a tc action…
csum – checksum update action Synopsis tc … action csum UPDATE UPDATE := TARGET [ UPDATE ] TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | sctp | SWEETS } SWEETS := { and | or | + } Description The csum action triggers checksum recalculation of specified packet…
connmark – netfilter connmark retriever action Synopsis tc … action connmark [ zone u16_zone_index ] [ CONTROL ] [ index u32_index ] CONTROL := { reclassify | pipe | drop | continue | ok } Description The connmark action is used to restore the connection’s mark value into the packet’s fwmark. Options zone u16_zone_index Specify…
CoDel – Controlled-Delay Active Queue Management algorithm Synopsis tc qdisc … codel [ limit PACKETS ] [ target TIME ] [ interval TIME ] [ ecn | noecn ] [ ce_threshold TIME ] Description CoDel (pronounced "coddle") is an adaptive "no-knobs" active queue management algorithm (AQM) scheme that was developed to address the shortcomings of…
choke – choose and keep scheduler Synopsis tc qdisc … choke limit packets min packets max packets avpkt bytes burst packets [ ecn ] [ bandwidth rate ] probability chance Description CHOKe (CHOose and Keep for responsive flows, CHOose and Kill for unresponsive flows) is a classless qdisc designed to both identify and penalize flows…
cgroup – control group based traffic control filter Synopsis tc filter … cgroup [ match EMATCH_TREE ] [ action ACTION_SPEC ] Description This filter serves as a hint to tc that the assigned class ID of the net_cls control group the process the packet originates from belongs to should be used for classification. Obviously, it…
CBS – Credit Based Shaper (CBS) Qdisc Synopsis tc qdisc … dev dev parent classid [ handle major: ] cbs idleslope idleslope sendslope sendslope hicredit hicredit locredit locredit [ offload 0|1 ] Description The CBS (Credit Based Shaper) qdisc implements the shaping algorithm defined by the IEEE 802.1Q-2014 Section 8.6.8.2, which applies a well defined…
CBQ – Class Based Queueing Synopsis tc qdisc … dev dev ( parent classid | root) [ handle major: ] cbq [ allot bytes ] avpkt bytes bandwidth rate [ cell bytes ] [ ewma log ] [ mpu bytes ] tc class … dev dev parent major:[minor] [ classid major:minor ] cbq allot bytes…