TCP/IP Management Programming Manual

Commands and Responses
HP NonStop TCP/IP Management Programming Manual—529636-001
6-89
STATISTICS Command
ZSTATS-ROUTE-RESET-TIME
is the time at which the routing statistics counters were last reset. This time
indicates the beginning of the sample period.
ZTCI-MAP-ICMP-STATS
is the extensible structured token that lists the statistics counters maintained for the
ICMP Layer during the sample period. These statistics are returned only for the
PROC object. This token has the token number ZTCI-TNM-ICMP-STATS and the
DDL definition ZTCI-DDL-ICMP-STATS.
Each counter is defined in a separate field. The fields in the
ZTCI-MAP-ICMP-STATS token are:
ZSTATS-ICMP-ERR
is the number of times an ICMP error has been generated during the sample
period. Note that Redirect messages are not included in the total. ICMP errors
can be caused by any of these reasons: invalid IP options, problems in
forwarding IP packets, or a UDP server crash.
ZSTATS-ICMP-OLD-SHORT
is the number of packets, received by the ICMP Layer of the TCP/IP
subsystem during the sample period, that were too short. This field is reserved
for future use.
ZSTATS-ICMP-OLD-ICMP
is the number of invalid ICMP packets received during the sample period.
ZSTATS-ICMP-OUT-HIST
is the output histogram of ICMP messages recorded during the sample period.
This histogram indicates the number of each type of ICMP message that the
TCP/IP subsystem sent to the network. Statistics are maintained in this
histogram for these ICMP messages:
Type 0 is the Echo Reply message.
This ICMP message is the reply to the Echo (8) message.
Essentially, an Echo Reply message is just the original Echo
message with the type changed from eight to zero and the
destination and source addresses reversed. The data returned in
the Echo Reply message is the same as that received in the Echo
message. The transmission of an Echo Reply message informs
the remote host that the local host is still alive. The data returned
also gives the remote host a means of testing the integrity of the
link.
Type 3 is the Destination Unreachable message.