TCP/IP Connection Termination

The TCP/IP Connection report lists information about individual TCP/IP connections, including job name, IP addresses and ports, data transferred and performance information.

It is generated from SMF type 119 subtype 1 and 2 records. These records are generated for every connection, so IBM warns to use them with care and this record subtype might not be routinely collected.

Tabs

• Server - The Passive Open (server socket) flag is set in the connection termination record

• Client - The Active Open (client socket) flag is set in the connection termination record

• Open - No termination record was found for this connection

Report Parameters

Parameter	Description
System	Filter by system.
Jobname	Filter by job name.
IP Addr	Filter by local or remote IP address
Port	Filter by local or remote port.

Columns

Column	Description
Time	The time the record was written (connection close).
System	The system that wrote the record.
Jobname	Connection address space name.
Remote IP	Remote IP address.
Remote Port	Remote port.
Local IP	Local IP address.
Local Port	Local port.
Conn ID	Connection ID.
Open	Connection establishment time.
Close	Session end time - the time session entered TIMEWAIT or LASTACK state.
Reason	Connection termination reason.
Duration	Time between connection establishment and TIMEWAIT or LASTACK.
Bytes In	Inbound byte count.
Bytes In/Sec	Average inbound transfer speed. Not useful if there were significant periods of time with no data transferred.
Bytes Out	Outbound byte count.
Bytes Out/Sec	Average outbound transfer speed. Not useful if there were significant periods of time with no data transferred.
Send Window	Send window at connection close.
Max Send Window	Maximum send window size.
Congestion Window	Congestion window at connection close.
Send Seg. Size	Send segment size at connection close.
RTT (ms)	Round trip time in milliseconds, at connection close.
RTT Variance	Round trip time variance estimator in milliseconds, at connection close.
Segments In	Inbound segment count.
Segments Out	Outbound segment count.
Dup Acks	Total number of DUP ACKs received.
Retransmits	Number of retransmits required.