1. Lab #2 WLAN performance measurement CS492 Fall 2006 (Fri, 10/13) Prof. Sue Moon Dooyoung Lee Haewoon Kwak Hyunwoo Chun

2. 2015-10-12 2 Measure TCP/UDP throughput varying # of the users connected to AP Same measurement with channel interference Compare TCP/UDP throughput without and with interference Objectives

3. 2015-10-12 3 Step 1: Learn how to use Iperf S/W

4. 2015-10-12 4 Iperf manual TCP –server: iperf –s –client : iperf –c “server IP addrs” “option values” UDP –server : iperf –s –u –client : iperf –c “server IP addrs” –u “option values” Option values (or parameters) –i : interval –o : output file –p : port(default is 5001) –b : bandwidth –etc..

5. 2015-10-12 5 Step 2: UDP/TCP test –No interference

6. 2015-10-12 6 Step 2-1: UDP test TA : execute iperf UDP demon –Iperf –s -u Students : connect to the UDP demon –Iperf –c “server IP address” –u –b 11M –i 1 > “filename.txt” Experiments –1) : disconnect your wireless connection to AP –2) : Team#1 connect to AP and iperf UDP demon –3) : Team#1 and Team#2 as the same way like second step –4) : Team #1,#2,#3,#4,#5 as the same way –5) : all (team #1 to team #9) “After each step, you have to upload your result file to the server”

7. 2015-10-12 7 Step 2-2: TCP test TA : execute iperf TCP demon –Iperf –s Students : connect to the TCP demon –Iperf –c “server IP address” –i 1 > “filename.txt” Experiments –1) : disconnect your wireless connection to AP –2) : Team#1 connect to AP and iperf TCP demon –3) : Team#1 and Team#2 as the same way like second step –4) : Team #1,#2,#3,#4,#5 as the same way –5) : all (team #1 to team #9) “After each step, you have to upload your result file to the server”

8. 2015-10-12 8 Step 3: CS-492 new Access Point UDP/TCP test under channel interference

9. 2015-10-12 9 Step 3-1 and Step 3-2 Same experiments like Step 2-1(UDP) and 2-2(TCP) –But file name is different UDP test –Filename : “UDP_interference_step number_team number.txt” –Ex. “UDP_interference_1_team 1.txt” TCP Test –Filename : “TCP_interference_step number_team number.txt” –Ex. “TCP_interference_1_team 1.txt” “After each step, you have to upload your result file to the server”

10. 2015-10-12 10 Step 4: Discussions What was the difference between TCP and UDP throughput under 802.11b wireless network? –Difference under number of users connect to AP –Difference under different channel Describe the reason why the throughput didn’t decrease linear as increasing number of user –Is there other factors affected the throughput? What was the difference between no interference and interference environments?

11. 2015-10-12 11 Homework #2 Each group connects to the same AP using two wireless LAN cards –Group 1 : team #1, #2 –Group 2 : team #3, #4 –Group 3 : team #5, #6 –Group 4 : team #7, #8, #9 Send and receive the packets at the same time using the Iperf for 1 hour –Record the date, location, time and throughput in an MS Excel file –Due 1pm on 10/19 : no delay permitted AP Embedded wireless card Linksys wireless card