DELL 9.8(0.0) User Manual

22

ICMP Message Types

This chapter lists and describes the possible ICMP message type resulting from a ping. The first three 
columns list the possible symbol or type/code. For example, you would receive a ! or 03 as an echo reply 
from your ping.
ICMP Messages and Their Definitions.

Symbol

Type

Code

Description

Query

Error

. 

Timeout (no reply)

!

0

3

echo reply

. 

U

3

destination unreachable:

0

network unreachable

. 

1

host unreachable

. 

2

protocol unreachable

. 

3

port unreachable

. 

4

fragmentation needed but don’t 
fragment bit set

. 

5

source route failed

. 

6

destination network unknown

. 

7

destination host unknown

. 

8

source host isolated (obsolete)

. 

9

destination network 
administratively prohibited

. 

10

destination host administratively 
prohibited

. 

11

network unreachable for TOS

. 

12

host unreachable for TOS

. 

13

communication administratively 
prohibited by filtering

. 

14

host precedence violation

. 

15

precedence cutoff in effect

. 

C

4

0

source quench

. 

5

redirect

. 

ICMP Message Types

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