User Tools

Site Tools


docs:guide-user:network:traffic-shaping:packet.scheduler.example1

Example1: Traffic Prioritizing with PRIO

#!/bin/sh
# A single user has 1000kbit upload for himself. But they want prioritizing.
 
# Variables
TC=$(which tc)
IPT=$(which iptables)
IPTMO="$IPT -t mangle -A POSTROUTING"
DEV=pppoe-dsl
 
insmod sch_prio
 
# The PRIO qdisc is a non-shaping container for a configurable number of classes
# which are dequeued in order. This allows for easy prioritization of traffic,
# where lower classes are only able to send if higher ones have no packets
# available.
 
$TC qdisc add dev $DEV root       handle 1:    prio default 30
$TC class add dev $DEV parent 1:  classid 1:1  prio rate 1000kbit?
$TC class add dev $DEV parent 1:1 classid 1:10 prio ??? #-- ssh, ACKs, VoIP, gaming
$TC class add dev $DEV parent 1:1 classid 1:20 prio ??? #-- http
$TC class add dev $DEV parent 1:1 classid 1:30 prio ??? #-- bulk, default, mails, etc
 
# Filter
# Since PRIO honors the TOS/QoS-Field by default, we should be concerned with our
# applications setting the right QoS for every packet they create. Additionally we
# can not blindly trust the set TOS and change it:
 
$IPTMO -N CHKTOS #-------------------------------create custom chain for this issue
$IPTMO -o $DEV -j CHKTOS #----every packet immediately jumps to custom-chain: CHKTOS
$IPTMO -A CHKTOS -m tos ! --tos Normal-Service -j RETURN #---if TOS is set, leave it
$IPTMO -A CHKTOS -p udp -j TOS --set-tos Minimize-Delay #-----UDP gets high priority
$IPTMO -A CHKTOS -p udp -m length --length :160 -j TOS --set-tos Minimize-Delay
#-- small udp packets
$IPTMO -A CHKTOS -p tcp -m length --length :128 -j TOS --set-tos Minimize-Delay
#-- small tcp packets get high priority
# If bulk traffic gets tunneled through ssh connections, change their TOS 
# (some programs do this by themselves, but not all):
$IPTMO -o $DEV -p tcp --dport 22 -m tos --tos Minimize-Delay -m connrate \
--connrate 20000:inf -j TOS --set-tos Maximize-Throughput
This website uses cookies. By using the website, you agree with storing cookies on your computer. Also you acknowledge that you have read and understand our Privacy Policy. If you do not agree leave the website.More information about cookies
docs/guide-user/network/traffic-shaping/packet.scheduler.example1.txt · Last modified: 2019/08/26 08:44 by vgaetera