Users Guide
ICMP Message Types
This section lists and describes the possible ICMP message type resulting from a ping. The rst 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 1. ICMP messages and their denitions
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
ltering
.
14 host precedence violation .
15 precedence cuto in eect .
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 .
9 0 router advertisement .
10 0 router solicitation .
19
602 ICMP Message Types