TCP/IP Configuration and Management Manual

SCF Reference
TCP/IP Configuration and Management Manual—427132-004
4-79
STATS PROCESS Command
(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 NonStop TCP/IP subsystem (functioning as a source host) to
indicate that there is a shorter path to the destination through another router or
gateway.
When the NonStop 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 NonStop TCP/IP subsystem services the In Redirect messages, it adds
a dynamic route entry of the name #DRTn. 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 router or gateway
sends this message to the NonStop TCP/IP subsystem to indicate it is receiving
datagrams more quickly than it can process them.
When the NonStop 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 NonStop TCP/IP subsystem first stops sending datagrams, then restarts
sending them, and gradually increases the number of datagrams sent.
If the NonStop 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 router or gateway
sends this message to notify the NonStop TCP/IP subsystem (functioning as a
source host) that the “time-to-live” field is 0 and that the router or gateway
discarded the datagram.
A destination host sends this message if the host cannot reassemble a fragmented
datagram within the time limit because fragments are missing. The destination host
then discards the datagram. When a Time Exceeded message is received, you
should check for routing loops.
In Timestamp
is the number of Timestamp (type 13) messages received. A host, router, or
gateway sends this message to indicate the last time it handled the message
before sending it.