TCP/IP (Parallel Library) Configuration and Management Manual

SCF Reference for Parallel Library TCP/IP
HP NonStop TCP/IP (Parallel Library) Configuration and Management Manual—522271-006
5-42
INFO MON Command for TCPMAN
TCP-INIT-REXMIT-TIMEOUT
is the initial retransmit timer value in milliseconds to use on a TCP connection.
When the first round-trip timer measurement is made on a TCP connection and the
calculation is done to arrive at the retransmission timeout to use on the next packet
sent, this value is used unless the calculated value is larger. This variable can be
used to help reduce the number of premature retransmission timeouts. The default
is 1000 milliseconds, or 1 second. The range is 200 to 30000 milliseconds.
TCP-MIN-REXMIT-TIMEOUT
is the minimum value allowed for the TCP retransmission timeout. If this value is
too low, the PTCPIP process might generate premature retransmissions. If this
value is set too high, real retransmissions are delayed, increasing the time for error
recovery. The default is 1000 milliseconds. The range is 50 to 30000 milliseconds.
TCP-LISTEN-QUE-MIN
is the minimum queue length that is set on a TCP socket when the PTCPIP
process handles a socket LISTEN or ACCEPT_NW1 function call. This value is
used if the queue length specified in the socket request is lower, otherwise the
queue length in the socket request is used. The default value is 5. The range is 1
to 1024.
INITIAL TTL
specifies the initial value for UDP and TCP TTL (Time To Live). The default is 64,
but may be altered to 30.
MIN-EPHEMERAL-PORT
is the starting port number to allocate for TCP and UDP ephemeral ports.
Ephemeral ports are those assigned by Parallel Library TCP/IP when an
application has not bound to a specific port. The default is 1024. The allowable
range is 1024 to (MAX-EPHEMERAL-PORT - 16). See Considerations on
page 5-29.
Everything below min-ephemeral-port requires super-group privileges. If you alter
min-ephemeral-port to be greater than 1024, be aware that all ports between 1024
and min-ephemeral-port can only be opened by privileged users, that is, super-
group users.
MAX-EPHEMERAL-PORT
is the largest port number to allocate for TCP and UDP ephemeral ports. The
default is 65024. The allowable range is (MIN-EPHEMERAL-PORT + 16) to 65535.
Each TCPMON is allocated one sixteenth of the range between min-ephemeral-
port and max-ephemeral-port. For example, using the defaults, #ZPTM0 is
allocated 1024-5023, #ZPTM1 is allocated 5024-9023 and so on. See
Considerations on page 5-29.