From mboxrd@z Thu Jan 1 00:00:00 1970 From: dale Date: Thu, 12 Jul 2007 19:51:14 +0000 Subject: [LARTC] voip quality/bandwidth/latency techniques Message-Id: <46968632.30801@czexan.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org 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 _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc