opnet12个经典的例子-Lab08-TCP.pdf只有8到12了，前面的找不到了。 OPNET就

文件名称: opnet12个经典的例子-Lab08-TCP.pdf

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详细说明：只有8到12了，前面的找不到了。 OPNET就是一个网络仿真技术软件包，它能够准确的分析复杂网络的性能和行为，在网络模型中的任意位置都可以插入标准的或用户指定的探头，以采集数据和进行统计。通过探头得到的仿真输出可以以图形化显示、数字方式观察、或者输出到第三方的软件包去。其产品结构有三个模块组成，能为用户提供一系列的仿真模型库，在电信、军事、航天航空、系统集成、咨询服务、大学、行政机关等方面被广泛应用。Configure the Applications 1. Right-click on the Applications node Edit Attributes Expand the Application Definitions attribute and set rows to 1= Expand the new row Name the row FTP Application . Expand the Description hierarchy= Edit the FTP row as shown (you will need to set the Special value to Not Used while editing the shown attributes) Ei"Inter-Request Time"Specification 相(Ftp)Tabe Allrilule Valu Dis ribution Name:->constart Command Mix(getTotal)100% Mean outcome 300 Inter-Request Time(seoon.constant(3600)K File Size(bytes) constant (10000000) Second Argument Not used Symbolic Server Name FTF Server Tvpe of Service Best Effort(0) RSVP Parameters None Back End Custom Applicati. Not Usod Help Cance Promote OK 2. Click oK twice and then save your project onfigure the Profiles 1. Right-click on the Profiles node= Edit Attributes= Expand the Profile Configuration attribute and set rows to 1 i. Name and set the attributes of row o as shown click OK EH(Profiles) Attribute Type: Ut Attribute Profiles ontic ④ Profile Configuration(- Frofile name FTP Profile ②/回A PP □row0 FTP Application FStart Time Offset. constant (5 FDuration (secand. End of Profile IRep atability Once at start Time Era e +Start Time(seconds) constant(100) ③3下 uration( seconds) End of simulation 田 Repeatability Once at Start Tir Apply Changes to Selected Objects Advanced Find Next OK onfigure the west Subnet: 1. Double-click on the West subnet node. You get an empty workspace, indicating that the subnet contains no objects 2. Open the object palette and make sure that the internet toolbox item is selected from the pull-down menu The ethernet4 slip 3. Add the following items to the subnet workspace: one ethernet server, one gtwy node model ethernet4 slip8 gtwy router, and connect them with a bidirectional 100 BaseT IP-based gateway supporting link = close the palette Rename the objects as shown Ethernet hub interfaces and eight serial line interface Router West 4. Right-click on the server West node=> Edit Attributes . Edit Application: Supported Services Set rows to 1= Set Name to FTP Application=> Click OK i edit the value of the server address attribute and write down server west lL. Expand the TCP Parameters hierarchy = Set both Fast Retransmit and Fast Recovery to Disabled 5. Click OK and then save your project Now, you have completed the configuration of the West subnet. To go back to the top level of the project, click the go to next higher leve button Configure the East Subnet. Double-click on the East subnet node. You get an empty workspace, indicating that the subnet contains no objects 2. Open the object palette and make sure that the internet toolbox item is selected from the pull-down menu 3. Add the following items to the subnet workspace: one ethernet wkstn, one ethernet4 slipa gtwy router, and connect them with a bidirectional 100 BaseT link= close the palette Rename the objects as shown Router east 4. Right-click on the Client_ East node=> Edit Attributes . Expand the Application: Supported Profiles hierarchy = Set rows to 1= Expand the row 0 hierarchy Set Profile Name to FTP Profile. i. Assign Client East to the client Address attributes lL. Edit the Application: Destination Preferences attribute as follows Set rows to1→ Set Symbolic Name to FTP Server→ Edit actual name→ Set rows to 1= In the new row, assign Server West to the Name column 5. Click OK three times and then save your project 6. You have now completed the configuration of the East subnet. To go back to the project space, click the Go to next higher level button Connect the subnets to the /p cloud. 1. Open the object palette 2. Using two PPP_ DS3 bidirectional links connect the East subnet to the IP Cloud and the west subnet to the iP cloud 3. A pop-up dialog box will appear asking you what to connect the subnet to the IP Cloud with, Make sure to select the routers 4. Close the palette Applications Profiles East USA Internet c 6 Choose the statistics Right-click on Server West in the West subnet and select Choose Individual Statistics from the pop-up menu 2. In the Choose Results dialog box, choose the following statistic TCP Connection= Congestion Window Size(bytes)and Sent Segment Sequence Number OPNET provides the following capture modes Right-click on the Congestion Window Size(bytes)statistic= Choose Change Collection Mode In the dialog box check Advanced From the drop-down All valucs--collccts every data point from a menu, assign all values to Capture mode as shown=> Click OK statistic Sample collects the data according to a user- Ea Congestion Window Si specified time interval or sample count For Capture mode all values example, if the time nterval is 10. dat sampled and recorded every 10th sccond. If the every CTotal of values 10th data point is recorded. All other data Bucket mode max value ts are discarded Bucket--collects all of the points over the time MAlaret interval or sample count into a data bucket, and cach bucket. This is thc default mode 4. Right-click on the Sent Segment Sequence Number statistic = Choose Change Collection Mode =In the dialog box check Advanced From the drop-down menu, assign all values to Capture mode 5. Click K twice and then save your project 6. Click the Go to next higher level button Configure the simulation Here we need to configure the duration of the simulation Click on and the Configure Simulation window should appear 2. Set the duration to be 10.0 minutes 3. Click OK and then save your project Duplicate the Scenario In the network we just created we assumed a perfect network with no discarded packets Also, we disabled the fast retransmit and fast recovery techniques in TCP. To analyze the effects of discarded packets and those congestion-control techniques we will create two additional scenarios With fast retransmit, 1. Select Duplicate Scenario from the Scenarios menu and give it the name TCP performs a Drop NoFast→ Click ok retransmission what appears to be the 2. In the new scenario, right-click on the IP Cloud Edit Attributes = Assign Issing segment, 0. 05% to the Packet discard Ratio attribute retransmission timer te 3. Click OK and then save your project fter fast retransmit 4. While you are still in the Drop_ NoFast scenario, select Duplicate Scenario from sends what appears to be the Scenarios menu and give it the name Drop_ Fast the missing segment, congestion avoidance 5. In the Drop Fast scenario right-click on server West, which is inside the West but not slow start is pertormed. This is the subnet→ Edit attributes→ Expand the TCP Parameters hierarchy→ Enable fast recovery algorith the Fast Retransmit attribute Assign Reno to the Fast Recovery attribute The fast retransmit and 6. Click oK and then save your project fast recovery algorithms are usually implemer togethe 2001) Run the simulation o run the simulation for the three scenarios simultaneously 1. Go to the Scenarios menu = Select Manage Scenarios 2. Change the values under the Results column to (or ) for the three scenarios. Compare to the following figure 图 Manage Scenarios Project Name: eha TCP H Scenario Name Saved Resulls Sinm DuraLium Time UniLs No Drop saved collect 10 minuti Drop NoFast saved s minute(s) 3 Drop_Fast d Congestion Window Size(bytes)and Sent Segment Sequence Number E view Results 回区 Discrete Event Graphs Displayed Panel Graphs 早 Global statistics V Show Preview Object Statistics 8U0U0 E Choose Frcm Maps Network 白W 40,00U.0 E Server West EH TCP Connection 0 400 800 e(sec Sent Segment Sequence Num Stacked Statistics This Scenario As Is Results generated: 00: 37: 21 Mar 202003 Unselect Add Close 3. Click Show. The resulting graphs should resemble the ones below 困 Server west of Choose From Maps Network. West回区 Annotation: conn1[]〔Pora0≤, Choose_ From_Map TCP Connection. Congestion Window Size(bytes) 00 Annatation: Cogan 1 [Ftp]:(Port 20)<-) Choose_From_Map TCP Connecton Sent Segment Sequence Number 10,000000 5m 4. To zoom in on the details in the graph, click and drag your mouse to draw a rectangle, as shown above 5. The graph should be redrawn to resemble the following one 困 Server_West of Choose From Maps Network.West回区 Annotation: Conn 1 Fp:(Port 20)<-> Choose_From_Maps TCP (bytes) 5000U 40000 20.D00 0 Annotation: Conn 1 [ Fp:(Port 20)<-> Choose_From_Map TCP Connection. Sent Segment Sequence Number 40,000,000 30 000 2I nn nnn 10000,000 1m44 2r 2m16s 2m32s 6. Notice the Segment Sequence Number is almost flat with every drop in the congestion window 10

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