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. 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.
Dale
tc qdisc del root dev eth1
tc qdisc add dev eth1 root handle 1: htb default 12
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
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
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