Section 8: administration and privileged commands
sfq – Stochastic Fairness Queueing Synopsis tc qdisc … [ divisor hashtablesize ] [ limit packets ] [ perturb seconds ] [ quantum bytes ] [ flows number ] [ depth number ] [ headdrop ] [ redflowlimit bytes ] [ min bytes ] [ max bytes ] [ avpkt bytes ] [ burst packets…
sfb – Stochastic Fair Blue Synopsis tc qdisc … blue rehash milliseconds db milliseconds limit packets max packets target packets increment float decrement float penalty_rate packets per second penalty_burst packets Description Stochastic Fair Blue is a classless qdisc to manage congestion based on packet loss and link utilization history while trying to prevent non-responsive flows…
sample – packet sampling tc action Synopsis tc … action sample rate RATE group GROUP [ trunc SIZE ] [ index INDEX ] tc … action sample index INDEX Description The sample action allows sampling packets matching classifier. The packets are chosen randomly according to the rate parameter, and are sampled using the psample generic…
route – route traffic control filter Synopsis tc filter … route [ from REALM | fromif TAG ] [ to REALM ] [ classid CLASSID ] [ action ACTION_SPEC ] Description Match packets based on routing table entries. This filter centers around the possibility to assign a realm to routing table entries. For any packet…
red – Random Early Detection Synopsis tc qdisc … red limit bytes [ min bytes ] [ max bytes ] avpkt bytes [ burst packets ] [ ecn ] [ harddrop ] [ nodrop ] [ bandwidth rate ] [ probability chance ] [ adaptive ] [ qevent early_drop block index ] [ qevent mark…
PRIO – Priority qdisc Synopsis tc qdisc … dev dev ( parent classid | root) [ handle major: ] prio [ bands bands ] [ priomap band band band… ] [ estimator interval timeconstant ] Description The PRIO qdisc is a simple classful queueing discipline that contains an arbitrary number of classes of differing priority….
police – policing action Synopsis tc … action police [ rate RATE burst BYTES[/BYTES] ] [ pkts_rate RATE pkts_burst PACKETS] [ mtu BYTES[/BYTES] ] [ peakrate RATE ] [ overhead BYTES ] [ linklayer TYPE ] [ CONTROL ] tc … filter … [ estimator SAMPLE AVERAGE ] action police avrate RATE [ CONTROL ]…
PIE – Proportional Integral controller-Enhanced AQM algorithm Synopsis tc qdisc … pie [ limit PACKETS ] [ target TIME ] [ tupdate TIME ] [ alpha int ] [ beta int ] [ ecn | noecn ] [ bytemode | nobytemode ] [ dq_rate_estimator | no_dq_rate_estimator ] Description Proportional Integral controller-Enhanced (PIE) is a control…
pfifo_fast – three-band first in, first out queue Description pfifo_fast is the default qdisc of each interface. Whenever an interface is created, the pfifo_fast qdisc is automatically used as a queue. If another qdisc is attached, it preempts the default pfifo_fast, which automatically returns to function when an existing qdisc is detached. In this sense…
pfifo – Packet limited First In, First Out queue bfifo – Byte limited First In, First Out queue Synopsis tc qdisc … add pfifo [ limit packets ] tc qdisc … add bfifo [ limit bytes ] Description The pfifo and bfifo qdiscs are unadorned First In, First Out queues. They are the simplest queues…
pedit – generic packet editor action Synopsis tc … action pedit [ex] munge { RAW_OP | LAYERED_OP | EXTENDED_LAYERED_OP } [ CONTROL ] RAW_OP := offset OFFSET { u8 | u16 | u32 } [ AT_SPEC ] CMD_SPEC AT_SPEC := at AT offmask MASK shift SHIFT LAYERED_OP := { ip IPHDR_FIELD | ip BEYOND_IPHDR_FIELD }…
NetEm – Network Emulator Synopsis tc qdisc … dev DEVICE ] add netem OPTIONS OPTIONS := [ LIMIT ] [ DELAY ] [ LOSS ] [ CORRUPT ] [ DUPLICATION ] [ REORDERING ] [ RATE ] [ SLOT ] LIMIT := limit packets DELAY := delay TIME [ JITTER [ CORRELATION ]]] [ distribution…
nat – stateless native address translation action Synopsis tc … action nat DIRECTION OLD NEW DIRECTION := { ingress | egress } OLD := IPV4_ADDR_SPEC NEW := IPV4_ADDR_SPEC IPV4_ADDR_SPEC := { default | any | all | in_addr[/{prefix|netmask}] Description The nat action allows to perform NAT without the overhead of conntrack, which is desirable if…
MQPRIO – Multiqueue Priority Qdisc (Offloaded Hardware QOS) Synopsis tc qdisc … dev dev ( parent classid | root) [ handle major: ] mqprio [ num_tc tcs ] [ map P0 P1 P2… ] [ queues count1 [at] offset1 count2 [at] offset2 … ] [ hw 1|0 ] [ mode dcb|channel] ] [ shaper dcb|…
mpls – mpls manipulation module Synopsis tc … action mpls { POP | PUSH | MODIFY | dec_ttl } [ CONTROL ] POP := pop protocol MPLS_PROTO PUSH := { push | mac_push } [ protocol MPLS_PROTO ] [ tc MPLS_TC ] [ ttl MPLS_TTL ] [ bos MPLS_BOS ] label MPLS_LABEL MODIFY := modify…
mirred – mirror/redirect action Synopsis tc … action mirred DIRECTION ACTION [ index INDEX ] dev DEVICENAME DIRECTION := { ingress | egress } ACTION := { mirror | redirect } Description The mirred action allows packet mirroring (copying) or redirecting (stealing) the packet it receives. Mirroring is what is sometimes referred to as Switch…
matchall – traffic control filter that matches every packet Synopsis tc filter … matchall [ skip_sw | skip_hw ] [ action ACTION_SPEC ] [ classid CLASSID ] Description The matchall filter allows to classify every packet that flows on the port and run a action on it. Options action ACTION_SPEC Apply an action from the…
IFE – encapsulate/decapsulate metadata Synopsis tc … action ife DIRECTION [ ACTION ] [ dst DMAC ] [ src SMAC ] [ type TYPE ] [ CONTROL ] [ index INDEX ] DIRECTION := { decode | encode } ACTION := { allow ATTR | use ATTR value } ATTR := { mark | prio…
HTB – Hierarchy Token Bucket Synopsis tc qdisc … dev dev ( parent classid | root) [ handle major: ] htb [ default minor-id ] [ r2q divisor ] [ offload ] tc class … dev dev parent major:[minor] [ classid major:minor ] htb rate rate [ ceil rate ] burst bytes [ cburst bytes…
HFSC – Hierarchical Fair Service Curve’s control under linux Synopsis tc qdisc add … hfsc [ default CLASSID ] tc class add … hfsc [ [ rt SC ] [ ls SC ] | [ sc SC ] ] [ ul SC ] rt : realtime service curve ls : linkshare service curve sc :…