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
5-90
STATS MON Command for TCPMAN
In Info Request
is the number of Information Request (type 15) messages received. A host or
gateway can send this message—with the network portion of the source address
and the destination address set to 0—to determine the number of the network on
which it is running. Any host on the network can respond to this request with an
Information Reply message.
In Param Problem
is the number of Parameter Problem (type 12) messages received. A host or
gateway sends this message to notify the Parallel Library TCP/IP subsystem
(functioning as a source host) that one of its datagrams has been discarded
because the header parameters are incorrect.
In Redirect
is the number of Redirect (type 5) messages received. A gateway sends this
message to the Parallel Library TCP/IP subsystem (functioning as a source host)
to indicate that there is a shorter path to the destination through another gateway.
When the Parallel Library TCP/IP subsystem receives a Redirect message, it
corrects its routing table to reflect the new route. If a host receives many Redirect
messages in a short period of time, it is usually an indication that the host is not
correcting its routing table.
When the Parallel Library TCP/IP subsystem services the In Redirect messages, it
adds a dynamic route entry of the name #DYRTn. This dynamic route is used in
lieu of the previous route which has been redirected.
In Source Quench
is the number of Source Quench (type 4) messages received. A gateway sends
this message to the Parallel Library TCP/IP subsystem to indicate that the gateway
is receiving datagrams more quickly than it can process them.
When the Parallel Library TCP/IP subsystem receives this message, it reduces the
rate at which it is sending datagrams by implementing a slow start. To implement a
slow start, the Parallel Library TCP/IP subsystem first stops sending datagrams,
then restarts sending them, and gradually increases the number of datagrams
sent.
If the Parallel Library TCP/IP subsystem is doing a lot of retransmissions, you
should check to see if Source Quench messages are being received. If they are,
you should reduce the number of packets being transmitted by your applications.
In Time Exceeded
is the number of Time Exceeded (type 11) messages received. A gateway sends
this message to notify the Parallel Library TCP/IP subsystem (functioning as a
source host) that the time-to-live field is 0 and that the gateway discarded the