Debug ip icmp

debug ip icmp

This command displays information about Internal Control Message Protocol (ICMP) transactions and allows you to monitor the ICMP messages sent and received by your router. Each ICMP message has a source, destination, type, and code number. RFC-792 provides complete coverage of the fields in debug ip icmp output. Example 5-8 is a debug ip icmp output sample that shows a case with five echo replies received, and a case with three host unreachable messages received.

Example 5-8 debug ip icmp Command Output

A_StubR#debug ip icmp

ICMP packet debugging is on

A_StubR#ping 131.1.18.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to !!!!!

131.1.18.1,

timeout is 2 seconds:

Success rate is 100 percent (5/5),

round-trip

min/avg/max = 4/5/8 ms

A_StubR#

ICMP: echo reply rcvd, src 131.1.1

8.1, dst 131

.1.18.14

ICMP: echo reply rcvd, src 131.1.1

8.1, dst 131

.1.18.14

Example 5-8 debug ip icmp Command Output (Continued)

ICMP

echo reply rcvd,

src 131.1.18

1,

dst 131.1.18.14

ICMP

echo reply rcvd,

src 131.1.18

1,

dst 131.1.18.14

ICMP

echo reply rcvd,

src 131.1.18

1,

dst 131.1.18.14

A_StubR#ping 10.1.1.1

Type

escape sequence to

abort.

Sending 5, 100-byte ICMP Echos to 1

3.1

.1

1, timeout is 2

seconds:

U.U.U

Success rate is 0 percent (0/5)

ICMP

dst (131.1.18.14)

host unreachable

rcv from 131.1.1

8.1

ICMP

dst (131.1.18.14)

host unreachable

rcv from 131.1.1

8.1

ICMP

dst (131.1.18.14)

host unreachable

rcv from 131.1.1

8.1

A_StubR#

+1 0

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