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Chapter 5
Applying Cisco's Diagnostic Tools
The address of interest is not listed in the ARP table, which means that
Router C does not know where to send the Layer 2 PDU. A trace using Ether-
Peek shows the router sending out an ARP broadcast:
Flags: 0x00
Status: 0x00
Packet Length:64
Timestamp: 11:30:42.713000 04/19/1999
Ethernet Header
Destination: ff:ff:ff:ff:ff:ff Ethernet Brdcast [0-5]
Source: 00:10:7b:d9:28:81 [6-11]
Protocol Type:08-06 IP ARP [12-13]
ARP - Address Resolution Protocol
Hardware: 1 Ethernet (10Mb) [14-15]
Protocol: 08-00 IP [16-18]
Hardware Address Length: 6 [19]
Protocol Address Length: 4
Operation: 1 ARP Request [20-21]
Sender Hardware Address: 00:10:7b:d9:28:81 [22-27]
Sender Internet Address: 172.16.60.1 [28-31]
Target Hardware Address: 00:00:00:00:00:00 (ignored)
[32-37]
Target Internet Address: 172.16.60.130 [38-41]
Extra bytes (Padding):
................ 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 [42-57]
.. 00 00 [58-59]
Frame Check Sequence: 0x00000000
No response was received from this broadcast. Let's list the facts that you
have gathered:
Router C cannot ping Host Z.
Interface Ethernet 0/1 is up and line protocol is up.
There are no collisions on the Ethernet interface.
No traffic is transiting the Ethernet 0/1 interface.
There is no listing for Host Z in the ARP table.
An ARP broadcast was sent out Ethernet 0/1, but no response was
received from Host Z.
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