diff --git a/delay-jitter-packetloss.sh b/delay-jitter-packetloss.sh
new file mode 100644
index 0000000..a28189f
--- /dev/null
+++ b/delay-jitter-packetloss.sh
@@ -0,0 +1,13 @@
+#
+#  Add output delay, jitter and packet loss.
+#
+#                                       +-- delay                        +-- lost percent
+#                  +-- interface        |    +-- jitter                  |   +-- burst
+#                  v                    v    v                           v   v
+tc qdisc add dev eth1 root netem delay 10ms 1ms distribution normal loss 4% 10%
+
+# Change.
+tc qdisc change dev eth1 root netem delay 10ms 1ms distribution normal loss 4% 10%
+
+# Delete.
+tc qdisc del dev eth1 root netem
diff --git a/virtualbox.sh b/virtualbox.sh
index 854ce5f..6395694 100644
--- a/virtualbox.sh
+++ b/virtualbox.sh
@@ -8,7 +8,7 @@
     VBoxManage list hostinfo
     VBoxManage list bridgedifs
     VBoxManage list ostypes
-   
+
 # Create a vm.
     VBoxManage createvm -name VMNAME
 
@@ -56,15 +56,15 @@
         --cableconnected5 on --cableconnected6 on --cableconnected7 on --cableconnected8 on \
         --macaddress1 00001D3C5F00 --macaddress2 00001D3C5F01 --macaddress3 00001D3C5F02 --macaddress4 00001D3C5F03 \
         --macaddress5 00001D3C5F04 --macaddress6 00001D3C5F05 --macaddress7 00001D3C5F06 --macaddress8 00001D3C5F07 \
-        
+
 # NIC with NAT.
     VBoxManage modifyvm VMNAME --nic1 nat
-    
+
 # NIC host only.
     VBoxManage modifyvm VMNAME --nic1 hostonly --hostonlyadapter1 vboxnet0
-    
+
 # NIC with udp tunnel.
-    VBoxManage modifyvm VMNAME --nic1 generic --nicgenericdrv1 UDPTunnel --nicproperty1 dest=127.0.0.1 --nicproperty1 dport=9000 --nicproperty1 sport=9001                
+    VBoxManage modifyvm VMNAME --nic1 generic --nicgenericdrv1 UDPTunnel --nicproperty1 dest=127.0.0.1 --nicproperty1 dport=9000 --nicproperty1 sport=9001
 
 # NIC bridged with real host interface.
     VBoxManage modifyvm VMNAME --nic1 bridged --bridgeadapter1 eth1
@@ -74,7 +74,7 @@
 
 # VM serial port to host tcp server socket.
     VBoxManage modifyvm VMNAME --uart1 0x3f8 4 --uartmode1 tcpserver 2000
-    
+
 # See the vm configuration.
     VBoxManage showvminfo VMNAME
 
@@ -86,7 +86,7 @@
 
 # Create a hdd disk.
     VBoxManage createmedium disk --filename hdddisk.vdi --size 2048 --format VDI --variant Standard
-    
+
 # Add hdd to vm.
     VBoxManage storageattach VMNAME --storagectl sata --port 0 --type hdd --mtype normal --medium FILENAME.vdi
 
@@ -115,7 +115,7 @@
 # Compact a hdd.
     VBoxManage modifymedium FILENAME.vdi --compact
 
-    
+
 #----- Serial port to host pipe -----
 
 # Install socat: