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Chapter 4
Cisco's Diagnostic Commands
Additional commands are available by answering yes to the extended
commands prompt. Extended options included the source IP address (it must
be an IP address that is present on the router), type of service, don't fragment
bit, data pattern, and header options.
Header options enable the route processor to analyze the packet header.
There are five header options:
Loose
Strict
Record
Timestamp
Verbose
The record option records the ICMP packets route to the destination
address. It records up to nine hops. You can see the results of using the
record packet header option in the previous output. The IP addresses
are the addresses of the exiting interface. If you follow the route, you
can see the packet leave the router and finally get to the destination on
the fourth hop. But wait a minute--there are still more addresses. Yes,
they are the addresses of the path back to the router. The path is
recorded for both directions, not just to the destination.
There is a final option that allows the router to increment the packet size
between 76 bytes and 18,024 bytes. Because it is an Ethernet interface, it
does not exceed 1500 bytes.
IPX
The extended options for IPX are not as extensive as with IP. The following
output depicts which options are available for an extended IPX ping:
Router_C#ping
Protocol [ip]: ipx
Target IPX address: C082B2B9.1171.587d.58fb
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Verbose [n]:
Novell Standard Echo [n]:
Type escape sequence to abort.
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