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-                      v5
+                      v6
 }}}
+'''It is a little bit tricky to configure delay/loss on a virtual machine'''[[BR]]
+Step 1: find our qdisc family number by executing "sudo /sbin/tc qdisc", a sample output could be like the following:
+{{{
+[shufeng@center ~]$ sudo /sbin/tc qdisc
+qdisc mq 0: dev eth0 root
+qdisc htb 150: dev eth1 root refcnt 9 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 140: dev eth1 parent 150:1 limit 1000
+qdisc htb 170: dev eth2 root refcnt 9 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 160: dev eth2 parent 170:1 limit 1000
+qdisc htb 130: dev eth3 root refcnt 9 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 120: dev eth3 parent 130:1 limit 1000
+}}}
+Now if the ethernet card you want to change is eth3, you can find the "parent qdisc id" you want to use is "120:1" by looking at the following line:
+{{{
+qdisc netem 120: dev eth3 parent 130:1 limit 1000
+}}}
+As a result, you change the delay/loss by executing the following:
+{{{
+sudo /sbin/tc qdisc add dev eth3 parent 120:1 netem delay 100ms loss 5%
+sudo /sbin/tc qdisc change dev eth3 parent 120:1 netem delay 100ms loss 5%
+sudo /sbin/tc qdisc del dev eth3 parent 120:1 netem delay 100ms loss 5%
+}}}