Difference between revisions of "Quality of Service"
From Zenitel Wiki
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| − | The [[Linux Console]] | + | The [[Linux Console]] can be used to check if QoS is active. SSH to the AMC-IP with standard user (alpha/com), then: |
$ su - | $ su - | ||
(root passord) | (root passord) | ||
Revision as of 11:50, 25 September 2014
Quality of Service (QoS) is set on all VoIP audio packages (UDP port 61000:61150) using Diffserv bit class EF (http://en.wikipedia.org/wiki/DiffServ#Expedited_Forwarding_.28EF.29_PHB)
The TOS byte in the IP header is set to DSCP (Diffserv) (http://en.wikipedia.org/wiki/Type_of_Service)
The Linux Console can be used to check if QoS is active. SSH to the AMC-IP with standard user (alpha/com), then:
$ su - (root passord) # iptables –t mangle –L –v
To change QoS settings:
# nano /opt/amc/scripts/networking
The following lines configures QoS:
# set DSCP class EF on all outgoing VoIP packages iptables -t mangle -A OUTPUT --protocol udp --destination-port 61000:61150 -j DSCP --set-dscp-class EF
The rule "udp dpts:61000:61150 DSCP set 0x2e" on the chain "OUTPUT" tells the linux kernel to set the DSCP field in the IP-header to hex 0x2e for all outgoing UDP packets within the port range 61000:61150. You can from the iptables command read out the number of packages and bytes this rule has been applied to.
The DSCP value 0x2e is also called Expedited Forwarding (EF). For details on the bits of the DSCP field in the IP header see: http://www.cisco.com/warp/public/105/dscpvalues.html