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Documents--NETW360 W3 ILab Instructions

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  NETW360 Week 3 Lab: Mixed 11b/11g WLAN PerformanceExplanaion and !ackgro nd  Although the 802.11x standards are designed to work together to some extent, some of the compromises made to further this aim do, in fact, have their own prices to pay.During the data gathering phase, the person designing an expansion to an existing wireless network has to pay particular attention to inventory legacy systems that may e re!uired to e incorporated into the new network and to carefully document the conse!uences if any# of leaving such legacy systems in place.$ossile conse!uences are the point of this la where we will examine what happens to an 802.11ginstallation when a legacy 802.11 node ecomes a part of the network and then leaves. #b$eci%e %ompare the total achievale &'A( throughputs measured in a mixed 11)11g &'A( and in an all*11g &'A( to study the performance degradation in 11g &'A(s that support legacy nodes. T&# ' +iven a wireless network containing one or more commonly reported prolems, propose methods to diagnose and repair the network. Me(odolog) ã %reate a wireless 'A( where all the stations and access point are operating at the 11g datarate of - ps. ã ake the stations generate traffic that is heavy enough to saturate the network to measure the highest aggregate throughput achieved in that 11g wireless 'A(. ã ake all this traffic to flow in the uplink direction i.e., to a destination that is outside of the wireless 'A(# to prevent the access point eing a ottleneck, and therefore, reducing the total throughput significantly. ã %onfigure a legacy station using 11 $/ while not generating any traffic that will roam andassociate with the aove descried 11g &'A( for a certain period of the simulation. ã %ompare the total achieved throughput in the 11g &'A( when the legacy node is associated and not associated with the &'A(s access point. Ne* +ea re, his la will introduce you to the use of animation and animated tra3ectories to emulate the moving o3ects we fre!uently see in wireless and other moile technologies. ou will e setting some of theimportant parameters used y the various o3ects.ou will also use the 4time controller,5 a feature that allows you to match the gathering of statistics to the animation. his allows you to match events in the data with precise positioning of moile o3ects.ou will e exposed to the ways in which 6$(7 handles wireless o3ects in contrast to static o3ects. or one thing, ecause wireless is a roadcast medium, much heavier calculation is re!uired ecause packets are roadcast. his means all o3ects within range are receiving the packets, so considerale calculations are re!uired over point*to*point and simulations may take longer to run. 1  Mixed 11b/11g WLAN PerformanceProced re Start OPNET Modeler  1- %lick the .#PNET Modeler  icon from %itrix applications. - 9elect +ile2#pen-3- he #PEN  screen will appear. Doule*click the +: drive. - :n the 4irecor) !ro*,er5 change your directory to +:op7model,NETW360-   Open the scenario 1.6pen the 1337WLAN scenario. he following scenario should open. Configure the destination node 1- ;ight*click on the node 4 4e,inaion 8aion and select Edi Arib e, . - 9et the attriute E(erne/E(erne Parameer,/Addre,, to 4 100- 2   &e will use this address as the destination address for the traffic generated y the 11g &'A( stations. 3- (ote that the attriute Traffic 9eneraion Parameer, is set to 4 None-  his node will not send any traffic into the network. - %lick # . &onfig ring WLAN ,aion, and acce,, poin, Configure the access point in Art Building (legacy access point). 1.;ight*click on the node 4 11b AP and select Edi Arib e, .2.7xpand the attriute Wirele,, LAN/Wirele,, LAN Parameer, .<.9et the attriute !88 ;denifier to 4 1 <one= .-.9et the attriute Acce,, Poin + ncionali) to 4 Enabled- .9et the Tran,mi Po*er to 4 0-003 watts. <   An example screenshot appears elow that represents the la authors environment when the la was created. ours may e slightly different. Note = %lick on the> !uestion mark icon# to the left of each parameter to see an explanationof that attriute. :t is important that you understand the attriutes as they control the ehavior of the o3ect in the real world, as well as in 6$(7. :t is also a good way to enhance your learning of wireless.'a ?uestion 1'a ?uestion 1= :n your opinion, what is the purpose of our dropping the = :n your opinion, what is the purpose of our dropping the Tran,mi Po*er Tran,mi Po*er   to such ato such alow level>low level>@.%lick # . Configure the access point in the Engineering Building (g access point) 1- ;ight click on the node 4 11g AP and select Edi Arib e, . - 7xpand the attriute Wirele,, LAN/Wirele,, LAN Parameer,-3- ake the following attriute configurations=a. !88 ;denifier >>    -
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