TCP/IP Management Programming Manual

Commands and Responses
HP NonStop TCP/IP Management Programming Manual—529636-001
6-20
ALTER Command
ZSPI-VAL-TRUE
specifies that an ACK for a TCP packet should be delayed until the TCP
receive window is completely filled, or one interval as defined by
ZDELAY-ACKS-TIME has expired, whichever occurs first.
By delaying the ACK, more than one packet can be acknowledged with a
single ACK, thereby reducing network traffic. This is the default. If this
value is set, see the ZDELAY-ACKS-TIME field for the time interval
between ACKs.
ZSPI-VAL-FALSE
specifies that an ACK should be returned as soon as a TCP packet is
received.
ZDELAY-ACKS-TIME
is an integer that specifies the time, in units of .01 seconds, that the TCP/IP
interface waits before sending an ACK for a TCP packet received from a
remote site. This field is only meaningful if the ZDELAY-ACKS field has a value
of ZSPI-VAL-TRUE. The value can be in the range of 1 through 100; however,
it is recommended that the value not exceed 20 (200 milliseconds). The default
value is 5 (50 milliseconds).
ZHOSTID
is a 32-bit integer that identifies the host. Typically, this value is the host
number portion of the IP address that has been assigned to the host. The
default is 0D. Note that this value is only used to support the gethostid socket
call.
ZHOSTNAME
is a character string of no more than 50 characters that identifies the host on
which the TCP/IP process is running. The default is null. Note that this value is
only used to support the gethostname socket call.
ZTCP-KEEPIDLE
is an integer that specifies the amount of time in seconds before TCP will issue
a keep-alive packet on sockets that have enabled this option. The default is
45 seconds. The range is 10 through 7200 seconds.
ZTCP-KEEPCNT
is an integer that specifies the number of times a keep-alive packet will be sent
without receiving an acknowledgment, after which the TCP connection will be
dropped. The default is 8. The range is 1 through 20.