TCP/IP Management Programming Manual

Commands and Responses
HP NonStop TCP/IP Management Programming Manual—529636-001
6-81
STATISTICS Command
ZSTATS-TCP-REXMIT
is the number of packets retransmitted during the sample period. Packets are
retransmitted when a packet is not acknowledged within a certain time interval.
The retransmission of packets can be caused by any of these conditions: the
network is overloaded, the other end of the connection is overloaded (so that
appropriate acknowledgments cannot be received or sent), or a packet is
received that has been corrupted (that is, a packet with an invalid checksum is
received).
ZSTATS-TCP-TIMEOUT
is the number of connection timeouts that occurred at the TCP Layer of the
TCP/IP subsystem during the sample period. A connection timeout is recorded
each time the keep-alive timer or the retransmission timer expires.
The keep-alive timer expires when the connection is inactive for a certain
period of time. This inactivity can be caused by the other end of the connection
going down or by network congestion.
The retransmission timer expires when a packet is not acknowledged within a
certain time period. The retransmission of packets can be caused by any of
these conditions: the network is overloaded, the other end of the connection is
overloaded (so that appropriate acknowledgments cannot be received and/or
sent), or a packet is received that has been corrupted (that is, a packet with an
invalid checksum is received).
ZSTATS-TCP-IN-CONN
is the number of incoming connection requests received by the TCP Layer of
the TCP/IP subsystem during the sample period.
ZSTATS-TCP-OUT-CONN
is the number of outgoing connection requests sent by the TCP Layer of the
TCP/IP subsystem during the sample period.
ZSTATS-TCP-IN-PKTS
is the number of incoming packets received by the TCP Layer of the TCP/IP
subsystem during the sample period.
ZSTATS-TCP-OUT-PKTS
is the number of outgoing packets sent by the TCP Layer of TCP/IP subsystem
during the sample period.
ZSTATS-TCP-NO-PORT
is the number of packets received by the TCP Layer of the TCP/IP subsystem
during the sample period for a connection that has been closed or does not