HTB as a child of another HTB

ddaas · 07-21-2005, 07:25 AM

Hi,
I am new to HTB and in the learning process I want to simulate a slower link on my server to see how qdisc works.
I have a 100Mbit connection.
I want to simulate a 100K connection and to divide traffic between FTP and SMB. (like in HTB user guide).
The problem is that it doesn’t work. I can transfer files with FTP of SAMBA at the wire speed. (Just like when there was no HTB and qdisc). What do I do wrong?

Here is my script:

Code:

#!/bin/bash

tc qdisc del dev eth0 root
iptables -F
iptables -F -t mangle

# qdisc for delay simulation
tc qdisc add dev eth0 root handle 100: htb
tc class add dev eth0 parent 100: classid 100:1 htb rate 100kbps

tc qdisc add dev eth0 parent 100:1 handle 1: htb

tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps
tc class add dev eth0 parent 1:1 classid 1:10 htb rate 50kbps ceil 100kbps prio 1
tc class add dev eth0 parent 1:1 classid 1:20 htb rate 50kbps ceil 100kbps prio 2

tc qdisc add dev eth0 parent 1:10 handle 22: sfq perturb 10
tc qdisc add dev eth0 parent 1:20 handle 23: sfq perturb 10

I've tried with u32 and with fw filter

Code:

 
tc filter add dev eth0 parent 1: protocol ip u32 match ip sport 20 0xffff flowid 1:10
tc filter add dev eth0 parent 1: protocol ip u32 match ip sport 139 0xffff flowid 1:20

OR

Code:

iptables -A OUTPUT -o eth0 -t mangle -p tcp --sport 20 -j MARK --set-mark 22
tc filter add dev eth0 parent 1: protocol ip handle 22 fw classid 1:10

iptables -A OUTPUT -o eth0 -t mangle -p tcp --sport 139 -j MARK --set-mark 33
tc filter add dev eth0 parent 1: protocol ip handle 33 fw classid 1:20

born4linux · 07-22-2005, 02:44 AM

what kind of setup do you have? you can only limit outgoing traffic only if you are the bottleneck ofyour networ like this:

internet-----YOU----LAN

or LAN1----YOU---LAN2

if won't work with YOU---LAN setup if you are only working with one interface.

ddaas · 07-22-2005, 02:58 AM

I have just a testing environment:

LINUX SERVER(where QoS is done) -> LAN

Quote:

if won't work with YOU---LAN setup if you are only working with one interface.

You say it doesn't work if I have 1 NIC? That's not true. Every outbound packet can be shaped. If I have just 2 computers with a crossover cable attached with each other I can shape the outgoing packets. I can shape packets on OUTGOUING and PREROUTING chain of netfilter/iptables.

My problem is that it doesn't work with 2 qdisc (as in HTB User guide - page 6 of 8)

Something like this:

Quote:

# qdisc for delay simulation
tc qdisc add dev eth0 root handle 100: htb
tc class add dev eth0 parent 100: classid 100:1 htb rate 100kbps

tc qdisc add dev eth0 parent 100:1 handle 1: htb
------------------------------------------------------------

I've tried other setups and everything works as expected.

Any idea with this setup (2 qdisc, one simulates a slower link)?

born4linux · 07-22-2005, 03:32 AM

he he, my mistake. i didn't think YOU<--->LAN (was thinking just one direction.) and as i've said - only for outgoing.

ok. i'll try and run your settings.

born4linux · 07-24-2005, 10:52 PM

uh well i can't figure it out or i'm interpreting the docs in a different way. anyway, i've seen your post in lartc mailing list (and that's the best place where to raise issues like this.

good luck.

ddaas · 07-25-2005, 03:21 AM

ok,
thanks