Lab Section 6.1: Testing for ICMP and ARP in .NET

Get Code 128 Code Set B in .NET Lab Section 6.1: Testing for ICMP and ARP
Lab Section 6.1: Testing for ICMP and ARP
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The last step in the previous chapter s lab exercises used the ping command. If a ping succeeds, it provides useful information in the form of reliability and latency statistics. If ping fails, however, it provides almost no diagnostic or troubleshooting information other than that something is broken. we have no indication whether the connectivity problem is with the source, the destination, or an intervening link between the two. By using debugging facilities, it is possible to narrow down and thus identify problems that may exist in any of these three areas. Objective In this exercise, you will use show and debug commands to verify the functioning of the ARP table and the operation of ping commands.
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Validation You will know you have succeeded if you are able to see debug output showing both ICMP request and reply packets on each router. 1. The first step to set up debugging is to define what information is desired and where it should go. Configure a log file that receives output from the debug/execution trace stream and delivers it to the terminal session. You may want to review the material on log files from 2 before continuing.
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*B:PE1# configure log log-id 33 *B:PE1>config>log>log-id$ from debug-trace *B:PE1>config>log>log-id$ to session *B:PE1>config>log>log-id$ exit *B:PE1#
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1a. Can you use a CLI Help function to find out how many log files can be configured 2. Configure which events will generate debug/execution trace information, for any listening log files.
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*B:PE1# debug router ip icmp
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2a. Use a CLI Help function to find out what other categories of events can be specified as a source of debug information. How many are there in the router ip context 3. From CE1 and PE2, attempt to ping the IP address of PE1 s interfaces. Observe the debug ICMP messages on the core routers.
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*A:CE1>config>router# ping 140.10.0.101 PING 140.10.0.101 56 data bytes 64 bytes from 140.10.0.101: icmp_seq=1 ttl=64 time=10ms. 64 bytes from 140.10.0.101: icmp_seq=2 ttl=64 time<10ms. [... Additional output omitted ...] [ Output captured from PE1 terminal session ] 1 2000/01/01 13:53:45.62 UTC MINOR: DEBUG #2001 Base PIP PIP: ICMP instance 1 (Base), interface index 4 (toCE1), ICMP ingressing on toCE1: 140.10.0.102 -> 140.10.0.101 type: Echo (8) code: No Code (0)
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2 2000/01/01 13:53:45.62 UTC MINOR: DEBUG #2001 Base PIP PIP: ICMP instance 1 (Base), interface index 4 (toCE1), ICMP egressing on toCE1: 140.10.0.101 -> 140.10.0.102 type: Echo Reply (0) code: No Code (0)
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3a. Examine the output on PE1 carefully. Each ICMP packet is numbered in ascending order. why are there 10 packets showing up on PE1 when CE1 only launched five ping requests 3b. Can you find where the ingress/egress interface is identified 4. Modify the ping command: The source IP address embedded in the ICMP Echo request packet should be the system interface address.
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*A:CE1# ping 140.10.0.101 source 140.10.0.3 PING 140.10.0.101 56 data bytes Request timed out. icmp_seq=1. Request timed out. icmp_seq=2. [... Additional output omitted ...] [ Output captured from PE1 terminal session ] 11 2000/01/01 14:04:50.33 UTC MINOR: DEBUG #2001 Base PIP PIP: ICMP instance 1 (Base), interface index 4 (toCE1), ICMP ingressing on toCE1: 140.10.0.3 -> 140.10.0.101 type: Echo (8) code: No Code (0) 12 2000/01/01 14:04:51.33 UTC MINOR: DEBUG #2001 Base PIP PIP: ICMP instance 1 (Base), interface index 4 (toCE1), ICMP ingressing on toCE1: 140.10.0.3 -> 140.10.0.101 type: Echo (8) code: No Code (0)
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4a. How many ICMP requests appear on CE1 How many requests are successfully received by PE1 How many replies are sent
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4b. In which direction (ingress/egress) is all the traffic flowing under these circumstances why 5. To verify ARP operation, turn on debug only for ARP on PE1. Start with an empty ARP cache by executing the following commands on each of the routers, and then start a ping to PE1 from either CE1 or PE2.
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*A:CE1# clear router arp all *B:PE1# clear router arp all *B:PE1# *B:PE1# show router arp ============================================================= ARP Table (Router: Base) ============================================================= IP Address MAC Address Expiry Type Interface ------------------------------------------------------------140.10.0.1 00:21:05:4d:41:41 00h00m00s Oth system 140.10.0.11 00:21:05:4d:41:41 00h00m00s Oth loopbackTest 140.10.0.97 00:1a:f0:57:72:6f 00h00m00s Oth[I] toPE2 140.10.0.101 00:1a:f0:6c:6c:4c 00h00m00s Oth[I] toCE1 ------------------------------------------------------------No. of ARP Entries: 4 ============================================================= *B:PE1# debug router ip no icmp *B:PE1# debug router ip arp *B:PE1# show debug debug router Base ip arp exit exit exit *A:CE1# ping 140.10.0.101 [... Additional output omitted ...] [ Output captured from PE1 terminal session ]
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