TCP/IP Connections

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TCP/IP Connections

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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.