dale wrote:
I have voip quality issues I would like to minimize. I have a ~=
3M/384k (Comcast) cable modem and a CentOS based Linux router (SME 7,
2.6.9 kernel) with 5 NAT'd devices (3 PCs "DHCP", 2 Vonage adapters
"static 10.10.2.10-11"). The quality problems are audio cutting out and
popping. I tried the following (see below) based on a Cookbook example,
but I still have audio popping. I have noticed popping corresponding
with web browsing, etc.
Maybe you need to consider shaping/policing ingress traffic aswell.
Any suggestions that may improve voip quality?
Also, are there any network metric capture/graphing tools that are
helpful to analyze these type of issues. I'm thinking of a graph that
shows various network metrics. I could watch the graph while using the
phone and correlate graph spikes with audio pops. Thanks in advance for
your help.
I don't use any graphing tools, but I would mark icmp as 1 aswell and
have ping running while testing.
Dale
tc qdisc del root dev eth1
tc qdisc add dev eth1 root handle 1: htb default 12
Since you mark all unmarked ip as 3 you don't need default 12 - it will
send arp to the worst class.
tc class add dev eth1 parent 1: classid 1:1 htb rate 300kbit ceil 300kbit
tc class add dev eth1 parent 1:1 classid 1:10 htb rate 200kbit ceil
300kbit prio 0
tc class add dev eth1 parent 1:1 classid 1:11 htb rate 50kbit ceil
300kbit prio 1
tc class add dev eth1 parent 1:1 classid 1:12 htb rate 30kbit ceil
300kbit prio 2
tc filter add dev eth1 parent 1:0 protocol ip prio 1 handle 1 fw classid
1:10
tc filter add dev eth1 parent 1:0 protocol ip prio 2 handle 2 fw classid
1:11
unused?
tc filter add dev eth1 parent 1:0 protocol ip prio 3 handle 3 fw classid
1:12
iptables -t mangle -A PREROUTING --src 10.10.2.10 -j MARK --set-mark 0x1
iptables -t mangle -A PREROUTING --src 10.10.2.10 -j RETURN
iptables -t mangle -A PREROUTING --src 10.10.2.11 -j MARK --set-mark 0x1
iptables -t mangle -A PREROUTING --src 10.10.2.11 -j RETURN
iptables -t mangle -A PREROUTING -j MARK --set-mark 0x3
Andy.
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