[shaper]

Accel-ppp support many ways customisation rate-limit. Also limiting clients bandwidths sometimes called as QoS (Quality of Service), but QoS has more possibilities. For enable rate-liniter, we can sets shaper in section [modules].

Config overview

attr=name

By default: attr=Filter-Id.

Specifies which radius attribute contains rate information. RADIUS server can transmit Filter-Id=1000, means 1000Kbit both up-stream and down-stream rate or Filter-Id=2000/3000, means 2000Kbit down-stream rate and 3000Kbit up-stream rate.

attr-up=name

By default is not defined.

Specifies which radius attribute contains rate information for upstream. Often used if needs separate upstream and downstream attributes.

attr-down=name

By default is not defined.

Specifies which radius attribute contains rate information for downstream. Often used if needs separate upstream and downstream attributes.

vendor=name

By default is not defined.

Specifies vendor name for support attributes of other vendors like Cisco-AVPair or Mikrotik.

Example for Cisco:

vendor=Cisco
attr=Cisco-AVPair

Example for Mikrotik:

vendor=Mikrotik
attr=Mikrotik-Rate-Limit
burst-factor=n

By default is not defined.

Burst will be calculated as rate multiply burst-factor. Common burst-factor for upstream calculated as burst-factor*10.

up-burst-factor=n

By default is up-burst-factor=1

Specifies burst factor for upstream.

down-burst-factor=n

By default is down-burst-factor=0.1

Specifies burst factor for downstream.

cburst=n

By default is cburst=1534

Specifies amount of bytes that can be burst at ‘infinite’ speed. Recommendation: cburst should be equal to at most one average packet

latency=n

By default is latency=0.05

Specifies latency (in milliseconds) parameter of tbf qdisc which set maximum amount of time a packet can sit in the TBF.

mpu=n

By default is mpu=0

Specifies mpu parameter in bytes of tbf qdisc and policer. Determines the minimal token usage for a packet.

r2q=n

By default is r2q=10

Specifies r2q parameter of root htb qdisc.

quantum=n

By default is quantum=1500

Specifies quantum parameter of htb classes. Amount of bytes a flow is allowed to dequeue before the scheduler moves to the next class.

moderate-quantum=1|0

By default is disabled moderate-quantum=0

If fixed quantum is not specified and this option is specified then shaper module will check for quantum value is valid (in range 1000-200000).

fwmark=n

By default is disabled: fwmark=0

Specifies the fwmark for traffic that won’t be passed through shaper.

up-limiter=police|htb

By default is: up-limiter=police

Specifes upstream rate limiting method.

down-limiter=tbf|htb

By default is: down-limiter=tbf

Specifies downstream rate limiting method.

ifb=ifb_ifname

By default ifb=ifb0

Specifies name of ifb interface, used only for up-limiter=htb

leaf-qdisc=qdisc parameters

By default is not defined.

In case if htb is used as up-limiter or down-limiter specified leaf qdisc can be attached automaticaly. At present sfq and fq_codel qdiscs are implemented. CoDel (the name comes from “controlled delay”) is Active Queue Manager. Parameters are same as for tc:

sfq [limit NUMBER] [perturb SECS] [quantum BYTES]

fq_codel [limit PACKETS] [flows NUMBER] [target TIME] [interval TIME] [quantum BYTES] [[no]ecn]

rate-multiplier=n

By default is rate-multiplier=1

Due to accel-ppp operates with rates in kilobit basis if you send rates in different basis then you can use this option to bring your values to kilobits. For vendor=Mikrotik often sets rate-multiplier=0.001

time-range=range_id,time_start-time_end

By default is not defined.

Specifies time ranges for automatic rate reconfiguration. You can specify multiple such options. Look examples below.

Examples

Fiter-Id

Cisco AVPair

Mikrotik