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Old 02-11-2004, 12:58 PM   #1
LQ Newbie
Registered: Jan 2004
Location: Meath, Ireland
Distribution: Red Hat Linux 9 - 2.4.20
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Traffic Control (tc) in Red Hat 9


I am a linux newbie and I have been trying to setup tc control in linux. I want to bandwidth manage traffic going out from my internal network to the external Internet. I have setup a Linux router to achieve this and I can access the Internet from my private internal LAN.

I have looked at a lot of docs regarding traffic control in Linux (including Linux 2.4 Advanced Routing How To) but I dont seem to be getting anywhere. Does anyone know any of any places where I can get help on this topic?

So far I have been playing around with following commands but I have yet to notice any bandwidth shaping on my internal network:

tc qdisc add dev eth0 root handle 1: htb default 12
tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps ceil 100kbps

Any help is appriciated!

Old 02-11-2004, 01:12 PM   #2
Registered: Jun 2002
Location: Breckenridge, Colorado
Distribution: Ubuntu Hardy 8.04
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I found this script in the Adv-Routing Howto i think. It worked for me but only does traffic shaping on an interface not on a port. I think you may be able to alter it though. Simply change the variables for your UPLINK AND DOWNLINK speed and the interface you want to shape.

# Setup For Your Internet Connection At Home
# Set the following values to somewhat less than your actual download
# and uplink speed. In kilobitsv
# clean existing down- and uplink qdiscs, hide errors
$TC qdisc del dev $DEV root 2> /dev/null > /dev/null
$TC qdisc del dev $DEV ingress 2> /dev/null > /dev/null

###### uplink

# install root CBQ

$TC qdisc add dev $DEV root handle 1: cbq avpkt 1000 bandwidth 10mbit

# shape everything at $UPLINK speed - this prevents huge queues in your
# DSL modem which destroy latency:
# main class

$TC class add dev $DEV parent 1: classid 1:1 cbq rate ${UPLINK}kbit \
allot 1500 prio 5 bounded isolated

# high prio class 1:10:

$TC class add dev $DEV parent 1:1 classid 1:10 cbq rate ${UPLINK}kbit \
allot 1600 prio 1 avpkt 1000

# bulk and default class 1:20 - gets slightly less traffic,
# and a lower priority:

$TC class add dev $DEV parent 1:1 classid 1:20 cbq rate $[9*$UPLINK/10]kbit \
allot 1600 prio 2 avpkt 1000

# both get Stochastic Fairness:
$TC qdisc add dev $DEV parent 1:10 handle 10: sfq perturb 10
$TC qdisc add dev $DEV parent 1:20 handle 20: sfq perturb 10

# start filters
# TOS Minimum Delay (ssh, NOT scp) in 1:10:
$TC filter add dev $DEV parent 1:0 protocol ip prio 10 u32 \
match ip tos 0x10 0xff flowid 1:10

# ICMP (ip protocol 1) in the interactive class 1:10 so we
# can do measurements & impress our friends:
$TC filter add dev $DEV parent 1:0 protocol ip prio 11 u32 \
match ip protocol 1 0xff flowid 1:10

# To speed up downloads while an upload is going on, put ACK packets in
# the interactive class:

$TC filter add dev $DEV parent 1: protocol ip prio 12 u32 \
match ip protocol 6 0xff \
match u8 0x05 0x0f at 0 \
match u16 0x0000 0xffc0 at 2 \
match u8 0x10 0xff at 33 \
flowid 1:10

# rest is 'non-interactive' ie 'bulk' and ends up in 1:20

$TC filter add dev $DEV parent 1: protocol ip prio 13 u32 \
match ip dst flowid 1:20

########## downlink #############
# slow downloads down to somewhat less than the real speed to prevent
# queuing at our ISP. Tune to see how high you can set it.
# ISPs tend to have *huge* queues to make sure big downloads are fast
# attach ingress policer:

$TC qdisc add dev $DEV handle ffff: ingress

# filter *everything* to it (, drop everything that's
# coming in too fast:

$TC filter add dev $DEV parent ffff: protocol ip prio 50 u32 match ip src \ police rate ${DOWNLINK}kbit burst 10k drop flowid :1
Old 02-11-2004, 01:33 PM   #3
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Registered: Jan 2004
Location: Meath, Ireland
Distribution: Red Hat Linux 9 - 2.4.20
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Thanks Fataldata...I'll giv dat a try..




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