Lab13 (1130244)
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Лабораторная работа № 13. Использование утилиты "traceroute"
Objectives:
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Use the traceroute Cisco IOS command from source router to destination router.
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Use the tracert Windows OS command from source workstation to destination router.
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Use the show ip route command to display the router's routing table.
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Verify that the network-layer between source, destination and each router along the way is working
properly. -
Retrieve information to evaluate the end-to-end path reliability.
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Determine delays at each point over the path and whether the host can be reached.
Step 1 - Log on to router.
Explanation: Connect to the router and login. Enter the password cisco if prompted.
1a. What prompt did the router display?
1b. What does it mean?
Step 2 - Enter trace (abbreviated form of traceroute).
Task: Enter trace at the router prompt.
2. What did the router respond with?
Note: After entering the trace command, you need to hit <enter> twice to return to the command line.
Step 3 - Enter trace ?
Task: Enter trace ? at the router prompt.
3. What did the router respond with?
Step 4 - Get help with trace ip command.
Task: Enter trace ip ? at the router prompt.
4. What did the router respond with?
Step 5 - Trace route from end router to end router.
Task: Enter trace ip xxx.xxx.xxx.xxx where xxx.xxx.xxx.xxx is the IP address of the target destination. Note: You will want to do this lab using one of the end routers and trace IP to the other end router. (note: ip is the default)
Explanation: Trace command is the ideal tool for finding where data is being sent in your network.
5. List the host name and IP address of the routers that the ICMP packet was routed through.
| Host Name | IP Address |
Step 6 - Trace the route to all other routers on your network.
Task: Repeat Step 5 with all other routers on your network.
Step 7 - Use tracert from a MS-DOS command prompt.
Task: From the console workstation click on Start/Programs/MS DOS Command Prompt. An MS-DOS Command Prompt window will open up. Enter tracert and the same IP address that you used in step 5.
Explanation: By using the MS-DOS window you will be using the TCP/IP stack of the workstation to begin the trace to the destination. The first hop will be your default gateway or the near side router interface on the LAN that the workstation is connected to.
6a. List the host name and IP address of the router that the ICMP packet was routed through.
| Host Name | IP Address |
6b. Why is there one more entry in the output of the tracert command when you trace from the computer command prompt to the target host?
Step 8 – Trace a route over the Internet.
Task: From a Windows 95/98 or NT workstation that has Internet access click on Start/Programs/MS DOS Command Prompt. An MS-DOS Command Prompt window will open up.
Enter tracert www.cisco.com.
7a. What is the IP address of www.cisco.com?
7b. How many hops did it take to get to www.cisco.com? If a packet passes through a router it is considered one (1) hop and the TTL of the packet is decremented by one (1).
Step 9 - View the routing table of the router.
Task: From the router prompt enter show ip route.
Explanation: This will show you the router's routing table.
8. List the IP network number addresses that are directly connect to you.
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