Act 2 - Mininet-WiFi: Deeper hands-on: Mobility & RSS

--- tags: mininet-wifi-tutorials --- # Act 2 - Mininet-WiFi: Deeper hands-on: Mobility & RSS ## Activity 1: Mobility Open examples/mobilityModel.py with any text editor: ```~/mininet-wifi$ sudo vim examples/mobilityModel.py``` And then change the speed of stations (from): ```net.setMobilityModel(time=0, model='RandomDirection', max_x=100, max_y=100, seed=20)``` to: ```net.setMobilityModel(time=0, model='RandomDirection', max_x=100, max_y=100, seed=1, min_v=0.1, max_v=0.1)``` Run _examples/mobilityModel.py_ and then ping sta1 and sta2: ``` ~/mininet-wifi$ sudo python examples/mobilityModel.py mininet-wifi>sta1 ping -c 10 sta2 ``` **Question 1.1**: What can you conclude about the observed latency? Tip: you can issue ```sta1 tc qdisc```, repeatedly, to see the values applied by tc. :::info You may want to have total control over the mobility of the nodes. If this is your case you can take a look at /examples/mobility.py :mega: ::: ## Activity 2: Received Signal Strength Open examples/position.py and add sta3 at position='40,20,10' and set max_z=100 in order to plot a 3D graph. Then, run examples/position.py. ``` ~/mininet-wifi$ sudo python examples/position.py ``` **Question 2.1**: What is the Received Signal Strength Indicator (RSSI) observed from sta3? **Question 2.2**: What is the average ping response time between sta2 and sta1? And between sta3 and sta1? Note: set the number of packets to 10 (ping -c10) You can also observe the RSSI by using monitor interfaces. To do so you will run examples/wmediumd_interferece.py. ``` ~/mininet-wifi$ sudo python examples/wmediumd_interference.py ``` Then, you need to create the monitor interface in sta1: ``` mininet-wifi> sta1 iw dev sta1-wlan0 interface add mon0 type monitor ``` Bring it up: ``` mininet-wifi> sta1 ifconfig mon0 up ``` and open Wireshark ``` mininet-wifi> sta1 wireshark ``` Right now, you can start sniffing beacons that are sent by ap1. Beacons contain RSSI, channel, among other things. :::info The way we create the monitor interface in Mininet-WiFi is the same as compared to the physical nodes that run Linux systems. :::