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Internet Control Message Protocol (ICMP) Message Types | 255
26
Internet Control Message Protocol (ICMP)
Message Types
This chapter lists and describes the possible internet control message protocol (ICMP) Message Types
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.
Table 26-1. 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
0 redirect for network
1 redirect for host
2 redirect for type-of-service and network
3 redirect for type-of-service and host
8 0 echo request
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