[LARTC] Difficulties trying to control VOIP traffic with TC - HTB

[Ricardo Soria]

Hi all:

I hope someone can help me with this "little"
problem...

I'm using a linux script to sub-divide my bandwidth
(64kbit) into:  40kbit for VOIP, and the remaining
24kbit for http.  So, the commands I'm using are:

============================================

#!/bin/bash

# This script shapes "downloading" stuff

# Initial qdisc
tc qdisc add dev eth1 root handle 1: htb default 20
r2q 2

# Classes definition
tc class add dev eth1 parent 1: classid 1:1 htb rate \
64kbit ceil 64kbit
tc class add dev eth1 parent 1:1 classid 1:10 htb \
rate 40kbit ceil 40kbit prio 0
tc class add dev eth1 parent 1:1 classid 1:20 htb \
rate 24kbit ceil 24kbit prio 1

# Filters

# This is filter for VOIP
tc filter add dev eth1 protocol ip parent 1:0 prio 1 \
u32 match ip dst 1.2.3.4 flowid 1:10

# Remaining traffic is supossed to go to default 20
class

# Script end

============================================

I reached this script after a lot of investigation and
tryings.  So, the bandwidth distribution seems to be
ok.  But here my problem:  Every time a person is
using VOIP, and another person starts surfing the
Internet (from a different IP, of course) at the same
time, the sound quality of the VOIP decreases notably.
 I have priorized VOIP traffic, as it can be seen on
"prio 0".  I even used IPTABLES statements to set
Minimize-Delay to packets coming from VOIP ip address.
 But every effort seems to be unuseful:  Every time
someone opens web browser, VOIP sound quality goes
down...

So, could someone tell me what's wrong about my
script??  I know it is possible to get what I'm trying
with htb, anyway...

Very thanks to everybody.

Cheers.

Ricardo Soria.

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