NEC NEAX 2000 IPS Maintenance Manual page 122

ICMP CLASSIFI-
TYPE CATION
11 Reply
(error)
12 Reply
(error)
• By sending ICMP TYPE=8 (ping request) to the destination terminal, you ask whether the terminal
is correctly connected/set or not.
• Receiving ICMP TYPE=0 (ping reply) from the destination terminal means that the terminal is
correctly connected/set.
• Receiving ICMP TYPE=3/11/12 (reply [error]) from the destination terminal means that the ter-
minal is not correctly connected/set.
NOTE 1:
If ICMP TYPE not listed above is received, "HARDWARE ERROR" is displayed.
NOTE 2: TOS (Type of Service) is present in IP header, and represents QoS (Quality of Service). Prece-
dence/delay/throughput/reliability that determine quality are contained within TOS.
CHAPTER 1 MAINTENANCE SERVICE FEATURES
List of ICMP TYPE
GENERAL DESCRIPTION
Reply message resulting by time
excess.
The message of packet discard
caused by TTL (Time To Live)
becomes 0 during transit, or the
message of time excess caused by
TTL becomes 0 during waiting for
lost fragments for re-assembly.
Reply message resulting by the IP
header being abnormal or a required
option is not effective.
– 112 –
MEANING
• TTL becomes 0 during transit
• TTL becomes 0 during waiting for
lost fragments for re-assembly.
• IP header abnormal
• Required options are unknown.
NWA-008847-001 Rev.3.0
PING COMMAND
a6ch1001.fm
OCTOBER/14/2005