[LARTC] VOIP Challenges...

* [LARTC] VOIP Challenges...
@ 2005-02-16  0:18 Some Clown
  2005-02-16  0:27 ` rsenykoff
                   ` (9 more replies)
  0 siblings, 10 replies; 11+ messages in thread
From: Some Clown @ 2005-02-16  0:18 UTC (permalink / raw)
  To: lartc

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Greetings - 

I'm new to QoS, so please be gentle (and yes, I've RTFM, though I don't
understand every bit of it)

Here's the thing; I've tried several scripts--simple and complex--for
classifying my Vonage traffic into a high-priority queue, but no matter what
I do it doesn't seem to work.  Right now I'm using the HTB script I'll
include below, which is a mashing together of several scripts I've found
along with a lot of the LARTC HOWTO stuff.  Bottom line; if I load up my
*outbound* connection and then try to make a Vonage call, my voice is so
chopped up at the other end that noone can understand me.

If it makes a difference, I *am* getting a few errors when I run this
script, but I'm a relative newbie to QoS so I'm not sure where my errors
lie.  I also thought that I might be having trouble with my MARKs in
IPTABLES, so I tossed in a line to filter based on IP DST/SRC instead of
relying on the marks (in a different, working IPTABLES script).

Any ideas?

Thanks.

--------- snip -----------------
#!/bin/sh

DOWNLINK="2800"
UPLINK="240"
DEV="eth0"
DEV2="eth1"
CEILING=$[100*$UPLINK/100]
MISC_RATE=$[90*$CEILING/100]

# 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

# Set packet queue much smaller than default (100):
ip link set dev $DEV2 qlen 10

## UPLINK ##

# Install root HTB; default traffic to 1:20
tc qdisc add dev $DEV root handle 1: htb r2q 1 default 20

# Shape everything at $CEILING speed - preventing huge queues in
# Cable modem which tend to destroy latency
tc class add dev $DEV parent 1: classid 1:1 htb rate ${CEILING}kbit

# Set up some branches for things
# 1:10 - High priority, interactive traffic, ICMP ECHO, TCP ACK
# 1:20 - Web, mail, standard stuff
# 1:30 - Everything else (Shareaza, etc.)

tc class add dev $DEV parent 1:1 classid 1:10 htb rate 128kbit ceil
${UPLINK}kbit prio 1
tc class add dev $DEV parent 1:1 classid 1:20 htb rate 64kbit ceil
${UPLINK}kbit prio 2
tc class add dev $DEV parent 1:1 classid 1:30 htb rate 64kbit ceil
${UPLINK}kbit prio 3

# All get Stochastic Fairness (except VOIP)
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
tc qdisc add dev $DEV parent 1:30 handle 30: sfq perturb 10

## FILTERS ##

# VOIP traffic in 1:0 (i.e. skip the HTB entirely and drop it directly into
the interface queue)
# MARKS (FROM IPTABLES):
#       VONAGE          (1)
#       SSH             (2)
#       WoW             (3)
#       TeamSpeak       (4)
#       Shareaza        (20)

tc filter add dev $DEV parent 1:0 protocol ip prio 1 handle 1 fw flowid 1:0
tc filter add dev $DEV parent 1:0 protocol ip prio 2 handle 2 fw flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 3 handle 3 fw flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 4 handle 4 fw flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 50 handle 20 fw flowid
1:30

# TOS Minimum Delay (ssh, NOT scp) in 1:10, ICMP (impress the ladies), AH,
DNS
tc filter add dev $DEV parent 1:0 protocol ip prio 10 u32 match ip tos 0x10
0xff flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 11 u32 match ip protocol
1 0xff flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 12 u32 match ip protocol
47 0xff flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 13 u32 match ip protocol
50 0xff flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 14 u32 match ip sport 53
0xffff flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 15 u32 match ip dport 53
0xffff flowid 1:10

# To speed up downloads while uploading, put ACKs in the interactive class
tc filter add dev $DEV parent 1: protocol ip prio 5 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

# VOIP Test - If this works, then it appears that our MARKing in IPTABLES is
getting @#$@#$ somewhere
tc filter add dev $DEV parent 1:0 protocol ip prio 1 u32 match ip dst
192.168.1.110 flowid 1:10
tc filter add dev $DEV parent 1:0 protocol ip prio 1 u32 match ip src
192.168.1.110 flowid 1:10

# Low-priority
tc filter add dev $DEV parent 1:0 protocol ip prio 40 u32 match ip dport 25
0xffff flowid 1:30
tc filter add dev $DEV parent 1:0 protocol ip prio 41 u32 match ip sport 25
0xffff flowid 1:30
tc filter add dev $DEV parent 1:0 protocol ip prio 42 u32 match ip sport 110
0xffff flowid 1:30
tc filter add dev $DEV parent 1:0 protocol ip prio 43 u32 match ip sport 143
0xffff flowid 1:30

#######################
## DOWNSTREAM CONFIG ##
#######################

# Ingress
tc qdisc add dev $DEV handle ffff: ingress

# VOIP
tc qdisc add dev $DEV parent ffff: protocol ip prio 90 handle 1 fw flowid :1

# Filter *everything* to it (0.0.0.0/0), drop whatever comes in too fast
tc filter add dev $DEV parent ffff: protocol ip prio 91 u32 match ip src \
        0.0.0.0/0 police rate $[80*$DOWNLINK/100]kbit burst 10k drop flowid
:1

# "Shift" the priority map "down" so that we have higher priority for VOIP
traffic.  Even
# packets leaving the ethernet interface will give priority to VOIP traffic
(we hope).
# default priomap ---------------------------------------- 1 2 1 1 2 2 2 2 0
0 0 0 1 1 1 1
tc qdisc add dev $DEV2 root handle 1: prio bands 3 priomap 2 2 2 2 2 2 2 2 1
1 1 1 2 2 2 2

# Define the queues, without any kind of rate limiting
tc qdisc add dev $DEV2 parent 1:1 handle 10: pfifo
tc qdisc add dev $DEV2 parent 1:2 handle 20: sfq
tc qdisc add dev $DEV2 parent 1:3 handle 30: sfq

tc filter add dev $DEV2 parent 1: protocol ip prio 5 handle 1 fw flowid 1:1
tc filter add dev $DEV2 parent 1: protocol ip prio 21 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 1:2
tc filter add dev $DEV2 parent 1: protocol ip prio 44 u32 match ip dport 25
0xffff flowid 1:2
tc filter add dev $DEV2 parent 1: protocol ip prio 45 u32 match ip sport 25
0xffff flowid 1:2
tc filter add dev $DEV2 parent 1: protocol ip prio 99 handle 20 fw flowid
1:3

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