[Asterisk-Users] Can you comment on this Qos script? How does one shape RTP?

[Doug Lytle]

cmisip wrote:

>far asterisk seems to use 1:10 while all other traffic uses 1:102.  How
>does one packet shape RTP?  
>
>Thanks for any help.
>
>
>
>
>#          +---------+
>#          | root 1: |
>#          +---------+
>#               |
># +----------------------------+
># |         class 1:1          |
># +----------------------------+
>#   |           |           |
># +----+      +----+      +----+
># |1:10|      |1:20|      |1:30|
># +----+      +----+      +----+
>#               |
>#      +--------+--------+
>#      |        |        |
>#   +-----+  +-----+  +-----+
>#   |1:100|  |1:101|  |1:102|
>#   +-----+  +-----+  +-----+
>
>  
>

I'm using the same script, but I found it searching Google.  Yours seems 
to be incomplete.  My script follows:

#!/bin/sh

TCOP="add"
IPTOP="-A"

if [ "$1" == "stop" ]; then
       echo "Stopping..."
       TCOP="del"
       IPTOP="-D"
fi

#          +---------+
#          | root 1: |
#          +---------+
#               |
# +----------------------------+
# |         class 1:1          |
# +----------------------------+
#   |           |           |
# +----+      +----+      +----+
# |1:10|      |1:20|      |1:30|
# +----+      +----+      +----+
#               |
#      +--------+--------+
#      |        |        |
#   +-----+  +-----+  +-----+
#   |1:100|  |1:101|  |1:102|
#   +-----+  +-----+  +-----+

# 1:10 is the class for VOIP traffic, pfifo qdisc
# 1:20 is for bulk traffic (htb, leaves use sfq)
# 1:30 is the class that interactive and TCP SYN/ACK traffic (sfq qdisc)

# 1:20 is further split up into different kinds of bulk traffic: web, 
mail and
# everything else.  1:100-102 fight amongst themselves for their slice 
of excess
# bandwidth, and in turn 1:10,20 and 30 then fight for any excess above 
their
# minimum rates.

# which interface to throw all this on (DSL)
IF=eth2

# ceil is 75% of max rate (768kbps)
# rate is 65% of max rate
# we don't let it go to 100% because we don't want the DSL modem 
(Pairgain MegaBit Modem 300S)
# to have a ton of packets in their buffers.  *we* want to do the buffering.
RATE=576
CEIL=640
#RATE=450
#CEIL=500

tc qdisc ${TCOP} dev ${IF} root handle 1: htb default 102
tc class ${TCOP} dev ${IF} parent 1:   classid 1:1 htb rate ${RATE}kbit 
ceil ${CEIL}kbit

tc class ${TCOP} dev ${IF} parent 1:1  classid 1:10 htb rate 64kbit ceil 
${RATE}kbit prio 1
tc class ${TCOP} dev ${IF} parent 1:1  classid 1:20 htb rate 64kbit ceil 
${RATE}kbit prio 2

tc class ${TCOP} dev ${IF} parent 1:20 classid 1:100 htb rate ${RATE}kbit
tc class ${TCOP} dev ${IF} parent 1:20 classid 1:101 htb rate ${RATE}kbit
tc class ${TCOP} dev ${IF} parent 1:20 classid 1:102 htb rate ${RATE}kbit

tc qdisc ${TCOP} dev ${IF} parent 1:10  handle 10:  pfifo
tc qdisc ${TCOP} dev ${IF} parent 1:100 handle 100: sfq perturb 10
tc qdisc ${TCOP} dev ${IF} parent 1:101 handle 101: sfq perturb 10
tc qdisc ${TCOP} dev ${IF} parent 1:102 handle 102: sfq perturb 10

tc filter ${TCOP} dev ${IF} parent 1:0 protocol ip prio 1 handle 1 fw 
classid 1:10
tc filter ${TCOP} dev ${IF} parent 1:0 protocol ip prio 4 handle 4 fw 
classid 1:100

# IAX2 prio 0.
iptables -t mangle ${IPTOP} PREROUTING -p udp -m udp --dport 4569 -j 
MARK --set-mark 0x1
iptables -t mangle ${IPTOP} PREROUTING -p udp -m udp --dport 4569 -j RETURN

# everything else goes into lowest priority (best effort).
iptables -t mangle ${IPTOP} PREROUTING -j MARK --set-mark 0x4
iptables -t mangle ${IPTOP} OUTPUT -j MARK --set-mark 0x4

Doug