CHAPTER 1 MAINTENANCE SERVICE FEATURES
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a6ch1001.fm
(7) ICMP TYPE used in this feature is as follows.
List of ICMP TYPE
Continued on next page
ICMP
TYPE
CLASSIFI-
CATION
GENERAL DESCRIPTION MEANING
0 Reply Reply to the echo request by exe-
cuting the ping command (echo
reply)
• Ping reply (ping OK)
3Reply
(error)
Reply message resulting by the ping
request has not arrived at a destina-
tion.
ICMP TYPE=3 is replied if the ping
request is rejected by firewall pro-
tection. And no reply is received if
the ping request cannot arrive at a
destination or ping request is disre-
garded by firewall protection.
• Network unreachable
• Host unreachable
• Protocol unusable
• Port unusable
• Fragmentation failed
• Source routing failed
• Destination network unknown
• Destination host unknown
• Source host isolated from network
• Rejection of destination network
• Rejection of destination host
• Network unreachable for TOS
NOTE2
• Communication administratively
prohibited by filtering
• Host precedence violation
• Precedence cutoff in effect
8 Request Request by executing the ping com-
mand (echo request)
• Ping request
OCTOBER/14/2005
PING COMMAND
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