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One of the best math tutors I ever had gave me some simple but effective advice He said that before I try to solve a problem, I should write down what I have to find out and what information I have to work with This advice carries over to troubleshooting internetwork problems as well, ie, if you can get a clear definition of what you are trying to do and gather appropriate information on the problem, you are well on the way to solving the problem When solving mathematics problems, all the information needed generally is presented to you, but when solving internetwork problems you have to get the information yourself Cisco makes this as straightforward as it can be by extensive show and debug commands You, however, must know which of these commands to use in a given situation in order to get the information you need Therein lies the art Internetwork problems generally fall into one of the following categories: 1A Physical layer issue with device interconnection, hardware, or line failure 2A Data Link layer issue involving configuration of internetwork device interfaces 3A Network layer issue with network protocol configuration or operation 4Performance or traffic congestion problems causing Transport layer timeouts 5A software bug either in the application using the internetwork, or within the Cisco IOS itself The first four points follow the first four layers of the ISO data communications model, starting at layer 1, the Physical level The fifth point covers all issues that arise in the top three layers of the ISO model This is generally the way I recommend people start to troubleshoot internetwork problems Start from the Physical layer and work upward It may not always work out so neatly that you can pinpoint an internetwork problem as being sourced within one layer's operation, but checking the operation of protocols on a layer-by-layer basis will give you a good view of how the problem manifests itself Before reviewing the simple troubleshooting scenario explored in Chap 3, there is one more point to consider before you rush in to fix things In many cases, it is very simple to make the situation drastically worse By rushing in and changing the configuration of devices on an internetwork, problems can occur that make the original situation seem like Nirvana The next two points always should be at the forefront of your mind when you're troubleshooting: 1Only change one variable at a time and observe the effect this has on the problem 2Always but always, and without exception, have a means of backing out of the change you are about to make There are a few other subtleties to consider, such as the effect on the processing power that i i i d b i d ill h b t ill th b b i.

In this exercise you will view your ARP cache to view the MAC addresses of systems that you have communicated with You will then ping the IP address of a system that does not appear in your ARP cache and verify that it was added to the cache After viewing the ARP cache, you will analyze Ping traffic from a capture file and view the ARP request being sent on the network 1 Go to the command prompt by selecting Start | Run, and then type cmd 3 Make a note of any entries that are in your ARP cache 4 Ping the IP address of a host on your network that was not in your ARP cache by typing ping <ip address> In the accompanying illustration, notice that the address of 1921681100 is pinged

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User Access Verification Username: test Password: [Connection to 1601211 closed by foreign host] Notice that the router closes the connection immediately after authentication A dynamic entry has been added to the access list The code NT1 NT below shows the output from "show access list" before and after user authentication Before: router#sh access-list Extended IP access list 101 permit tcp any host 1601211 eq telnet

5 At the command prompt, type arp -a 6 Notice that the system that you have pinged is in the cache This is because in order for any data to be sent to the target system, your system will need to know the MAC address of that system, and an ARP request went out to figure out the address; it was then stored in cache You can see in the accompanying illustration that the address of 1921681100 and the associated MAC address are stored in the cache

issuing a given debugging command will have, but we will cover these on a case-by-case basis when we examine examples If you adhere to the aforementioned two guidelines, you should be in good shape, and will probably not turn a problem into a crisis I will not examine the use of third-party devices such as LAN or WAN analyzers, although there are many excellent products on the market that will help you In the main, the tools provided by Cisco are adequate to troubleshoot the vast majority of problems encountered If you master all that Cisco offers you, however, by all means explore third-party devices

In this part of the exercise you will open a packet capture made with Network Monitor, and you will analyze the traffic that occurs when you ping another system Understand that Ping is just one example of communication between two systems and that no matter what type of communication occurs, the MAC address must be determined 7 Start Network Monitor from Start | Programs | Administrative Tools | Network Monitor Open the packet capture called pingcap from the Lab Files\PacketCaptures folder 8 Once you have the packet capture open, notice that there are 13 frames in the capture, as seen in the accompanying illustration Further, by looking at the protocol column in the capture you can see that there are two ARP frames (frames 3 and 4) You can also see that frame 3 is the ARP request going out to the network, and frame 4 is the ARP reply coming back to the system

9 Frame 3 is the ARP request; we need to find out whom the request is for Doubleclick frame 3 and expand the Ethernet section in the detail pane to determine the destination MAC address of the frame (shown in the accompanying illustration) Record the MAC address information in the space provided: Destination MAC Address: _____________________ Source MAC Address: _________________________ Ethernet Type: _______________________________

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Same as backspace, ie, delete the character before the cursor Delete characters to end of line The characters are held in a buffer and can be recalled for later insertion in a command line Delete to end of line; again, the characters go to a buffer Used to insert control characters in the command line It tells the user interface to treat the next character literally, rather than as an editor command Delete the previous word Paste the character from the buffer (same as the yank command in Unix) Show the first line from the history buffer Show the last line from the history buffer Move cursor back one word Delete the word in front of the cursor Move the cursor forward one word Delete the word before the cursor

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