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--- qos_project [2017/12/07 14:42] – [6. [CO3] Shaping the Traffic] enwan
+++ qos_project [2017/12/15 11:37] – [8. [PO3] Analyzing QoS] carine
@@ Line 242: / Line 242: @@
   * On the Server side: we open VLC media player : Go to media - stream - we add the desired video - Stream - Next - for the new destination we choose UDP legacy then we click on add - we add the destination IP address 192.168.100.111 (client) and the port number 1234 - next - we uncheck the active transcoding - next  stream.
-  * On the client side: we open VLC and then we click on play - go to network and specify the network URL : udp://@:1234 and finally we click on play.
+  * On the client side: we open VLC and then we click on play, go to network and specify the network url: ''udp:\\@:1234'' and finally we click on play.
 ===== -. [CO3] Shaping the Traffic  =====
@@ Line 268: / Line 266: @@
 We run flent with VLC and we noticed that the video wasn't affected because flent uses TCP.
+===== -. [PO2] Implementing QoS  =====
+The QoS will be implemented on the outgoing interface (Wan) of the router TP-Link.
+First, we have to check the existing configuration, on the router by typing the following command :
+<code bash> tc qdisc ls </code>
+To delete the previous configurations we can use :
+<code bash> tc qdisc del dev eth1 root </code>
+__**
+Traffic classification and scheduling :**__
+The scheduler we will be using is the Hierarchical fair-service curve (HFSC).
+We start by creating a common class for all types of traffic. The used commands for this are:
+<code bash> tc qdisc add dev eth1 root handle 1: hfsc default 20 </code>
+<code bash> tc class add dev eth1 parent 1: classid 1:1 hfsc sc rate 8000kbit ul rate 8000kbit </code>
+Supposing we have two types of traffic: Video UDP associated with class 1:40 running on destination port 1234, and iperf UDP with class 1:50 running on destination port 5201. In the first case, the dedicated bandwidth is ((87/100)*8000)= 6960 Kbit and in the second case it's 1040 Kbit.
+The following commands are used:
+<code bash> tc class add dev eth1 parent 1:1 classid 1:40 hfsc ls rate 6960kbit ul rate 8000kbit </code>
+<code bash> tc class add dev eth1 parent 1:1 classid 1:50 hfsc ls rate 1040kbit ul rate 8000kbit </code>
+<code bash> iptables -t mangle -A POSTROUTING -o eth1 -p udp --dport 1234 -j CLASSIFY --set-class 1:40 </code>
+<code bash> iptables -t mangle -A POSTROUTING -o eth1 -p udp --dport 5201 -j CLASSIFY --set-class 1:50 </code>
+To see the iptables commands excecuted on the router we can use:
+<code bash> iptables -t mangle -L </code>
+===== -. [PO3] Analyzing QoS  =====
+ In this section, we have to consider different congestion scenarios: The link between the two routers will have a bandwidth of 16 Mb/s, 8 Mb/s and 5 Mb/s.
+__**1. 16Mb/s**__
+First, we have to create a common class 1:1 for all types of traffic, as before.
+Then, the following commands are executed in order to create two classes: 1:20 for video udp traffic with a bandwidth of ((87*16000)/100) and 1:30 for iperf tcp and udp traffic with a bandwidth of ((13*16000)/100).
+<code bash> tc class add dev eth1 parent 1:1 classid 1:20 hfsc ls rate 13920kbit ul rate 16000kbit </code>
+<code bash> tc class add dev eth1 parent 1:1 classid 1:30 hfsc ls rate 2080kbit ul rate 16000kbit </code>
+<code bash> iptables -t mangle -A POSTROUTING -o eth1 -p udp --dport 1234 -j CLASSIFY --set-class 1:20 </code>
+<code bash> iptables -t mangle -A POSTROUTING -o eth1 -p udp --dport 5201 -j CLASSIFY --set-class 1:30 </code>
+<code bash> iptables -t mangle -A POSTROUTING -o eth1 -p tcp --dport 5202 -j CLASSIFY --set-class 1:30 </code>
+We will be running three types of traffic:
+  * VLC video udp
+  * iperf udp traffic on destination port 5201
+  * iperf tcp traffic on destination port 5202, using the following commands:
+      **On the server side:**
+      <code bash> iperf3 -s -p 5202 </code>
+      **On the client side:**
+      <code bash> iperf3 -c 192.168.100.111 -P 3 -p 5202 -t 75 </code>