Shaping incoming VoIP traffic fails

Linux Advanced Routing and Traffic Control

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Hello,

I'm trying to get lossless VoIP traffic over my 3000k/500k ADSL line. Shaping 
outgoing traffic is no problem: I set total ceil for outgiong device (ppp0) 
to 450kbit and put VoIP into highest prio class. Even during full upload the 
voice is clean on the other end.

Now I tried to get the same result for incoming data. I attached HTB to eth1 
where the incoming voip traffic is forwarded to. But even when I set the 
ceiling for other traffic as low as 800kbit there are drop outs in incoming 
voice while "full" downloading.

Could I setup HTB better than below? Should I reduce eth1's queue length (now 
1000)? If yes, how?

Thanks.
Daniel

-------- 8< --------
INT=eth1

# creating root and root class
tc qdisc add dev $INT root handle 1: htb default 10
tc class add dev $INT parent 1: classid 1:1 htb rate 1000mbit prio 0


# class for not forwarded traffic (and sfq leaf)
tc class add dev $INT parent 1:1 classid 1:10 htb \
    rate 997mbit ceil 1000mbit prio 1
tc qdisc add dev $INT parent 1:10 handle 10: sfq perturb 10


# class for forwarded traffic
tc class add dev $INT parent 1:1 classid 1:11 htb \
    rate 2500kbit ceil 2500kbit prio 0

# class for highest prio VOIP (and sfq leaf)
tc class add dev $INT parent 1:11 classid 1:110 htb \
    rate 200kbit ceil 2500kbit prio 0
tc qdisc add dev $INT parent 1:110 handle 110: sfq perturb 10

# class for higher prio traffic (and sfq leaf)
tc class add dev $INT parent 1:11 classid 1:111 \
    htb rate 1200kbit ceil 1500kbit prio 1
tc qdisc add dev $INT parent 1:111 handle 111: sfq perturb 10

# class for low prio traffic (and sfq leaf)
tc class add dev $INT parent 1:11 classid 1:112 htb \
    rate 100kbit ceil 800kbit prio 2
tc qdisc add dev $INT parent 1:112 handle 112: sfq perturb 10


# filters for forwarded traffic
tc filter add dev $INT parent 1: prio 0 protocol ip handle 110 fw flowid 1:110
tc filter add dev $INT parent 1: prio 1 protocol ip handle 111 fw flowid 1:111
tc filter add dev $INT parent 1: prio 2 protocol ip handle 112 fw flowid 1:112



# iptables ruels for marking forwarded traffic

# put everything to lowest prio
iptables -t mangle -A FORWARD -o $INT -j MARK --set-mark 112

# VOIP traffic -> 110
iptables -t mangle -A FORWARD -o $INT -p udp --sport sip \
    -j MARK --set-mark 110
iptables -t mangle -A FORWARD -o $INT -p udp --dport sip \
    -j MARK --set-mark 110
iptables -t mangle -A FORWARD -o $INT -p udp --dport 10000:10500 \
    -j MARK --set-mark 110


# higher prio 
iptables -t mangle -A FORWARD -o $INT -p tcp -m multiport \
    --sports 22,80,443,143 -j MARK --set-mark 111
iptables -t mangle -A FORWARD -o $INT -p icmp -j MARK --set-mark 111

-------- >8 --------
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