Netstat STATS/-S report
Displays TCP/IP statistics for IP, ICMP, TCP, and UDP protocols. You can use the PROTOCOL filter to display statistics for only a specific protocol.
TSO syntax
Modifier
Target
Provide the report for a specific TCP/IP address space by using TCp tcpname. See The Netstat command target for more information about the TCp parameter.
Output
The default output option displays the output on the user's terminal. For other options, see The TSO NETSTAT command syntax or Netstat command output.
z/OS UNIX syntax
Modifier
- PROTOcol protocol
- Display statistics for the specified protocol. The valid protocols
are IP, ICMP, TCP, and UDP.Result: If you specify TCP, you get both TCP and SMC-R statistics. For more information about SMC-R support, see Shared Memory Communications over Remote Direct Memory Access in the z/OS Communications Server: IP Configuration Guide.
Target
Provide the report for a specific TCP/IP address space by using -p tcpname. See The Netstat command target for more information about the TCp parameter.
Output
The default output option displays the output to z/OS UNIX shell stdout. For other options, see The z/OS UNIX netstat command syntax or Netstat command output.
Command syntax examples
From TSO environment
NETSTAT STATS
Provides TCP/IP statistics for IP, ICMP, TCP and UDP protocols.
NETSTAT STATS PROTOCOL IP
Provides TCP/IP statistics for IP protocol. If the stack is IPv6-enabled, then the
statistics for IPv6 protocol are also displayed.
NETSTAT STATS PROTOCOL ICMP
Provides TCP/IP statistics for ICMP protocol. If the stack is IPv6-enabled, then
the statistics for ICMPv6 protocol are also displayed.
NETSTAT STATS PROTOCOL TCP
Provides TCP/IP statistics for TCP protocol. If the stack is enabled for SMC-R,
then the statistics for SMC-R are also displayed.
NETSTAT STATS PROTOCOL UDP
Provides TCP/IP statistics for UDP protocol.From UNIX shell environment
netstat -S
netstat -S PROTOCOL IP
netstat -S PROTOCOL ICMP
netstat -S PROTOCOL TCP
netstat -S PROTOCOL UDPReport examples
The following examples are generated by using TSO NETSTAT command. Using the z/OS UNIX netstat command displays the data in the same format as the TSO NETSTAT command.
Not IPv6 enabled (SHORT format)
NETSTAT STATS
MVS TCP/IP NETSTAT CS V2R1 TCPIP Name: TCPCS 15:14:15
IP Statistics
Packets Received = 25164
Inbound Calls from Device Layer = 12241
Inbound Frame Unpacking Errors = 0
Inbound Discards Memory Shortage = 0
Received Header Errors = 0
Received Address Errors = 4961
Datagrams Forwarded = 067
Unknown Protocols Received = 0
Received Packets Discarded = 3
Received Packets Delivered = 20203
Output Requests = 8773
Output Discards No Route = 0
Output Discards DLC Sync Errors = 0
Output Discards DLC Async Errors = 0
Output Discards Memory Shortage = 0
Output Discards (other) = 0
Reassembly Timeouts = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
Inbound Packets handled by zIIP = 12490
Outbound Packets handled by zIIP = 4912ICMP Statistics
Received Sent
-------- ----
Messages 1366 7
Errors 0 0
Destination Unreachable 1359 0
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenchs 0 0
Redirects 0 0
Echos 7 0
Echo Replies 0 7
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0
TCP Statistics
Current Established Connections = 11
Current Stalled Connections = 0
Current Servers In Connection Flood = 0
Active Connections Opened = 122
Passive Connections Opened = 7
Connections Closed = 78
Established Connections Dropped = 8
Connection Attempts Dropped = 4
Connection Attempts Discarded = 2
Timewait Connections Reused = 0
Segments Received = 10900
Header Prediction Ok for ACK = 1643
Header Prediction Ok for Data = 3213
Duplicate ACKs = 134
Discards for Bad Checksum = 0
Discards for Bad Header Length = 0
Discards for Data too Short = 9
Discards for Old Timestamp = 2
Segments Completely Duplicate = 23
Segments Partially Duplicate = 4
Segments Completely After Window = 0
Segments Partially After Window = 0
Segments Out of Order = 43
Segments Received After Close = 2
Window Probes Received = 5
Window Updates Received = 9
Segments Received on OSA Bulk Queues= 9
Segments Sent = 8382
Window Updates Sent = 723
Delayed ACKs Sent = 43
Resets Sent = 4
Segments Retransmitted = 21
Retransmit Timeouts = 0
Connections Dropped by Retransmit = 0
Path MTU Discovery Retransmits = 0
Path MTU Beyond Retransmit Limit = 0
Window Probes Sent = 2
Connections Dropped during Probe = 0
KeepAlive Probes Sent = 0
Connections Dropped by KeepAlive = 0
Connections Dropped by Finwait2 = 0
Configured Ephemeral Ports = 200
Configured Ephemeral Ports In Use = 5
Configured Ephemeral Ports Max Usage= 5
Ephemeral Ports Exhausted = 0SMCR Statistics
Current Established SMC Links = 2
SMC Link Activation Time Outs = 0
Active SMC Links Opened = 4
Passive SMC Links Opened = 0
SMC Links Closed = 2
Current Established Connections = 1
Active Connections Opened = 1
Passive Connections Opened = 0
Connections Closed = 0
Segments Received = 1
Segments Sent = 1
Resets Sent = 0
Resets Received = 0
UDP Statistics
Datagrams Received = 6984
No Port Errors = 2312
Receive Errors = 0
Datagrams Sent = 368
Configured Ephemeral Ports = 200
Configured Ephemeral Ports In Use = 6
Configured Ephemeral Ports Max Usage= 7
Ephemeral Ports Exhausted = 0NETSTAT STATS PROTOCOL IP
MVS TCP/IP NETSTAT CS V2R1 TCPIP Name: TCPCS 15:14:15
IP Statistics
Packets Received = 25164
Inbound Calls from Device Layer = 12241
Inbound Frame Unpacking Errors = 0
Inbound Discards Memory Shortage = 0
Received Header Errors = 0
Received Address Errors = 4961
Datagrams Forwarded = 067
Unknown Protocols Received = 0
Received Packets Discarded = 3
Received Packets Delivered = 20203
Output Requests = 8773
Output Discards No Route = 0
Output Discards DLC Sync Errors = 0
Output Discards DLC Async Errors = 0
Output Discards Memory Shortage = 0
Output Discards (other) = 0
Reassembly Timeouts = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
Inbound Packets handled by zIIP = 12490
Outbound Packets handled by zIIP = 4912NETSTAT STATS PROTOCOL ICMP
MVS TCP/IP NETSTAT CS V2R1 TCPIP Name: TCPCS 15:14:15
ICMP Statistics
Received Sent
-------- ----
Messages 1366 7
Errors 0 0
Destination Unreachable 1359 0
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenchs 0 0
Redirects 0 0
Echos 7 0
Echo Replies 0 7
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0 IPv6 enabled or request for LONG format
NETSTAT STATS
MVS TCP/IP NETSTAT CS V2R1 TCPIP Name: TCPCS 15:14:15
IP Statistics (IPv4)
Packets Received = 34
Received Header Errors = 0
Received Address Errors = 3
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 3
Received Packets Delivered = 46
Output Requests = 31
Output Discards No Route = 0
Output Discards (other) = 0
Reassembly Timeouts = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
Inbound Packets handled by zIIP = 12490
Outbound Packets handled by zIIP = 4912
IPv6 Statistics
Packets Received = 0
Received Header Errors = 0
Received Address Errors = 0
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 0
Received Packets Delivered = 0
Output Requests = 0
Output Discards No Route = 0
Output Discards (other) = 0
Reassembly Timeouts = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
Inbound Packets handled by zIIP = 0
Outbound Packets handled by zIIP = 0
IP General Statistics
Inbound Calls from Device Layer = 91
Inbound Frame Unpacking Errors = 0
Inbound Discards Memory Shortage = 0
Output Discards DLC Sync Errors = 0
Output Discards DLC Async Errors = 0
Output Discards Memory Shortage = 0 ICMP Statistics (IPV4)
Received Sent
-------- ----
Messages 12 12
Errors 0 12
Destination Unreachable 12 12
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenchs 0 0
Redirects 0 0
Echos 0 0
Echo Replies 0 0
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0
ICMPv6 Statistics
Received Sent
-------- ----
Messages 0 4
Errors 0 0
Destination Unreachable 0 0
Time Exceeded 0 0
Parameter Problems 0 0
Redirects 0 0
Echos 0 0
Echo Replies 0 0
Administratively Prohibited 0 0
Packet Too Big 0 0
Router Solicitations 0 0
Router Advertisements 0 0
Neighbor Solicitations 0 0
Neighbor Advertisements 0 0
Group Membership Queries 0 0
Group Membership Responses 0 4
Group Membership Reductions 0 0 TCP Statistics
Current Established Connections = 2
Current Stalled Connections = 0
Current Servers In Connection Flood = 0
Active Connections Opened = 1
Passive Connections Opened = 1
Connections Closed = 0
Established Connections Dropped = 0
Connection Attempts Dropped = 0
Connection Attempts Discarded = 0
Timewait Connections Reused = 0
Segments Received = 6
Header Prediction Ok for ACK = 0
Header Prediction Ok for Data = 2
Duplicate ACKs = 0
Discards for Bad Checksum = 0
Discards for Bad Header Length = 0
Discards for Data too Short = 0
Discards for Old Timestamp = 0
Segments Completely Duplicate = 0
Segments Partially Duplicate = 0
Segments Completely After Window = 0
Segments Partially After Window = 0
Segments Out of Order = 0
Segments Received After Close = 0
Window Probes Received = 0
Window Updates Received = 0
Segments Received on OSA Bulk Queues= 9
Segments Sent = 7
Window Updates Sent = 0
Delayed ACKs Sent = 2
Resets Sent = 0
Segments Retransmitted = 0
Retransmit Timeouts = 0
Connections Dropped by Retransmit = 0
Path MTU Discovery Retransmits = 0
Path MTU Beyond Retransmit Limit = 0
Window Probes Sent = 0
Connections Dropped during Probe = 0
KeepAlive Probes Sent = 0
Connections Dropped by KeepAlive = 0
Connections Dropped by Finwait2 = 0
Configured Ephemeral Ports = 200
Configured Ephemeral Ports In Use = 5
Configured Ephemeral Ports Max Usage= 5
Ephemeral Ports Exhausted = 0
SMCR Statistics
Current Established SMC Links = 2
SMC Link Activation Time Outs = 0
Active SMC Links Opened = 4
Passive SMC Links Opened = 0
SMC Links Closed = 2
Current Established Connections = 1
Active Connections Opened = 1
Passive Connections Opened = 0
Connections Closed = 0
Segments Received = 1
Segments Sent = 1
Resets Sent = 0
Resets Received = 0
UDP Statistics
Datagrams Received = 0
No Port Errors = 12
Receive Errors = 0
Datagrams Sent = 12
Configured Ephemeral Ports = 200
Configured Ephemeral Ports In Use = 6
Configured Ephemeral Ports Max Usage= 7
Ephemeral Ports Exhausted = 0
NETSTAT STATS PROTOCOL IP
MVS TCP/IP NETSTAT CS V2R1 TCPIP Name: TCPCS 15:14:15
IP Statistics (IPv4)
Packets Received = 34
Received Header Errors = 0
Received Address Errors = 3
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 3
Received Packets Delivered = 46
Output Requests = 31
Output Discards No Route = 0
Output Discards (other) = 0
Reassembly Timeouts = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
Inbound Packets handled by zIIP = 12490
Outbound Packets handled by zIIP = 4912
IPv6 Statistics
Packets Received = 0
Received Header Errors = 0
Received Address Errors = 0
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 0
Received Packets Delivered = 0
Output Requests = 0
Output Discards No Route = 0
Output Discards (other) = 0
Reassembly Timeouts = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
Inbound Packets handled by zIIP = 0
Outbound Packets handled by zIIP = 0
IP General Statistics
Inbound Calls from Device Layer = 91
Inbound Frame Unpacking Errors = 0
Inbound Discards Memory Shortage = 0
Output Discards DLC Sync Errors = 0
Output Discards DLC Async Errors = 0
Output Discards Memory Shortage = 0 NETSTAT STATS PROTOCOL ICMP
MVS TCP/IP NETSTAT CS V2R1 TCPIP Name: TCPCS 15:14:15
ICMP Statistics (IPV4)
Received Sent
-------- ----
Messages 12 12
Errors 0 12
Destination Unreachable 12 12
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenchs 0 0
Redirects 0 0
Echos 0 0
Echo Replies 0 0
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0
ICMPv6 Statistics
Received Sent
-------- ----
Messages 0 4
Errors 0 0
Destination Unreachable 0 0
Time Exceeded 0 0
Parameter Problems 0 0
Redirects 0 0
Echos 0 0
Echo Replies 0 0
Administratively Prohibited 0 0
Packet Too Big 0 0
Router Solicitations 0 0
Router Advertisements 0 0
Neighbor Solicitations 0 0
Neighbor Advertisements 0 0
Group Membership Queries 0 0
Group Membership Responses 0 4
Group Membership Reductions 0 0 Report field descriptions
Most of the TCP/IP statistics for IP, ICMP, TCP, and UDP protocols are defined in the SNMP IP-MIB (RFC2011 - SNMPv2 Management Information Base for the Internet Protocol Using SMIv2), TCP-MIB (RFC 2012 - SNMPv2 Management Information Base for the Transmission Control Protocol Using SMIv2), and UDP-MIB (RFC 2013 - SNMPv2 Management Information Base for the User Datagram Protocol Using SMIv2) MIB modules. See these SNMP MIB modules for more detailed information.
- The following describes the IPv4 and IPv6 statistics displayed:
- Packets Received
- The total number of input datagrams received from interfaces.
- Received Header Errors
- The number of input datagrams discarded due to errors in their IP headers.
- Received Address Errors
- The number of input datagrams discarded because the IP address in their IP header's destination field was not valid.
- Datagrams Forwarded
- The number of input datagrams forwarded to their final destination.
- Unknown Protocols Received
- The number of datagrams discarded because of an unknown or unsupported protocol.
- Received Packets Discarded
- The number of input datagrams that were discarded that are not accounted for in another input discard counter.
- Received Packets Delivered
- The total number of input datagrams successfully delivered to IP user-protocols.
- Output Requests
- The total number of IP datagrams that local IP user-protocols supplied to IP in requests for transmission.
- Output Discards No Route
- The number of IP datagrams discarded because no route could be found to transmit them to their destination.
- Output Discards (Other)
- The number of output datagrams generated by this stack that could not be transmitted.
- Reassembly Timeouts
- The number of packets that were being held for reassembly but which were discarded due to the fact that the remaining fragments were not received within reassembly timeout.
- Reassembly Required
- The number of IP fragments received that needed to be reassembled.
- Reassembly Successful
- The number of IP datagrams successfully reassembled.
- Reassembly Failures
- The number of failures detected by the IP reassembly algorithm.
- Datagrams Successfully Fragmented
- The number of IP datagrams that have been successfully fragmented.
- Datagrams Failing Fragmentation
- The number of IP datagrams that have been discarded because they needed to be fragmented but could not be.
- Fragments Created
- The number of IP datagram fragments that have been generated as a result of fragmentation.
- Inbound Packets handled by zIIP
- The number of inbound packets that were processed by a zIIP. This counter applies only to IPSec workloads, whose CPU cycles are being displaced to a zIIP. The Packets Received counter includes the packets that are received on zIIP, so the percentage of total inbound packets that were processed by zIIP can be calculated as (Inbound Packets handled by zIIP ÷ Packets Received) × 100. Similarly, the number of inbound packets that were processed by General Purpose Processors is equal to (Packets Received - Inbound Packets handled by zIIP).
- Outbound Packets handled by zIIP
- The number of outbound packets that were processed by a zIIP. This counter applies only to IPSec workloads, whose CPU cycles are being displaced to a zIIP. The Output Requests counter includes the outbound packets processed on zIIP, so the percentage of total outbound packets that were processed by zIIP can be calculated as (Outbound Packets handled by zIIP ÷ Output Requests) × 100. Similarly, the number of outbound packets that were processed by General Purpose Processors is equal to (Output Requests - Outbound Packets handled by zIIP).
- The following describes the IP general statistics displayed. The
statistic values for these counters reflect both IPv4 and IPv6 processing
combined.
- Inbound Calls from Device Layer
- The number of times the inbound TCP/IP Data Path has received control from the Device Layer.
- Inbound Frame Unpacking Errors
- The number of times a received frame could not be unpacked into its constituent datagrams.
- Inbound Discards Memory Shortage
- The number of inbound packets discarded due to a CSM storage shortage condition.
- Output Discards DLC Sync Errors
- The number of outbound packets discarded due to a synchronous error in the Data Link Control.
- Output Discards DLC Async Errors
- The number of outbound packets discarded due to an asynchronous error in the Data Link Control.
- Output Discards Memory Shortage
- The number of outbound packets discarded due to a CSM storage shortage condition.
- The following describes the ICMP statistics displayed:
- Messages
- The total number of ICMP messages received and sent.
- Errors
- The number of ICMP messages received and sent but determined as having ICMP-specific errors.
- Destination Unreachable
- The number of ICMP Destination Unreachable messages received and sent.
- Time Exceeded
- The number of ICMP Time Exceeded messages received and sent.
- Parameter Problems
- The number of ICMP Parameter Problem messages received and sent.
- Source Quenchs
- The number of ICMP Source Quench messages received and sent.
- Redirects
- The number of ICMP Redirect messages received and sent.
- Echos
- The number of ICMP Echo (request) messages received and sent.
- Echo Replies
- The number of ICMP Echo Reply messages received and sent.
- Timestamps
- The number of ICMP Timestamp (request) messages received and sent.
- Timestamp Replies
- The number of ICMP Timestamp Reply messages received and sent.
- Address Masks
- The number of ICMP Address Mask (request) messages received and sent.
- Address Mask Replies
- The number of ICMP Address Mask Reply messages received and sent.
- The following describes the ICMPv6 statistics displayed:
- Messages
- The total number of ICMPv6 messages received and sent.
- Errors
- The number of ICMPv6 messages received and sent but determined as having ICMPv6-specific errors.
- Destination Unreachable
- The number of ICMPv6 Destination Unreachable messages received and sent.
- Time Exceeded
- The number of ICMPv6 Time Exceeded messages received and sent.
- Parameter Problems
- The number of ICMPv6 Parameter Problem messages received and sent.
- Redirects
- The number of ICMPv6 Redirect messages received and sent.
- Echos
- The number of ICMPv6 Echo messages received and sent.
- Echo Replies
- The number of ICMPv6 Echo Reply messages received and sent.
- Administratively Prohibited
- The number of ICMPv6 Administratively Prohibited messages received and sent.
- Packet Too Big
- The number of ICMPv6 Packet Too Big messages received and sent.
- Router Solicitations
- The number of ICMPv6 Router Solicitation messages received and sent.
- Router Advertisements
- The number of ICMPv6 Router Advertisement messages received and sent.
- Neighbor Solicitations
- The number of ICMPv6 Neighbor Solicitation messages received and sent.
- Neighbor Advertisements
- The number of ICMPv6 Neighbor Advertisement messages received and sent.
- Group Membership Queries
- The number of ICMPv6 Group Membership Queries received and sent.
- Group Membership Responses
- The number of ICMPv6 Group Membership Responses received and sent.
- Group Membership Reductions
- The number of ICMPv6 Group Membership Reductions received and sent.
- The following describes the TCP statistics displayed:
- Current Established Connections
- The number of TCP connections for which the current state is either
ESTABLISHED or CLOSE-WAIT. Guideline: This value, when displayed for TCP statistics, includes the number of TCP connections across SMC-R links. To determine the number of TCP connections that are not across SMC-R links, subtract the value for Current Established Connections displayed under SMCR Statistics from this value.
- Current Stalled Connections
- The number of TCP connections whose send data flow is stalled.
The send data flow is considered stalled if one or more of the following
conditions are true:
- The TCP send window size is less than 256 or is less than the smaller of the largest send window that has been seen for the connection and the default MTU. The TCP send window size is set based on values provided by the TCP peer. The default MTU for IPv4 is 576. The default MTU for IPv6 is 1280.
- The TCP send queue is full and the data is not being retransmitted.
- Current Servers In Connection Flood
- The number of TCP servers under a potential connection flood attack. A server is considered under a potential connection flood attack when backlog queue expansion is required to handle the incoming connection requests. When more than 25 servers are under a potential connection flood attack, no server's backlog queue will be allowed to expand.
- Active Connections Opened
- The number of times TCP connections have made a direct transition
to the SYN-SENT state from the CLOSED state. Guideline: This value, when displayed for TCP statistics, includes the number of TCP connections across SMC-R links that made a direct transition to the SYN-SENT state from the CLOSED state. To determine the number of these TCP connections that are not across SMC-R links, subtract the value for Active Connections Opened displayed under SMCR Statistics from this value.
- Passive Connections Opened
- The number of times that TCP connections have made a direct transition to the SYN-RCVD state from the LISTEN state. This value, when displayed for TCP statistics, includes the number of TCP connections across SMC-R links that made a direct transition to the SYN-RCVD state from the LISTEN state. To determine the number of the TCP connections that are not across SMC-R links, subtract the value for Passive Connections Opened displayed under SMCR Statistics from this value.
- Connections Closed
- Number of TCP connections that have corresponding sockets closed.Guideline: This value, when displayed for TCP statistics, includes the number of TCP connections across SMC-R links that have corresponding sockets closed. To determine the number of these TCP connections that are not across SMC-R links, subtract the value for Connections Closed displayed under SMCR Statistics from this value.
- Established Connections Dropped
- The number of times TCP connections made a direct transition to the CLOSED state from either the ESTABLISHED state or the CLOSE-WAIT state. This value includes the number of TCP connections across SMC-R links.
- Connection Attempts Dropped
- The number of times TCP connections have made a direct transition to the CLOSED state from either the SYN-SENT state or the SYN-RCVD state, plus the number of times TCP connections have made a direct transition to the listen state from the SYN-RCVD state.
- Connection Attempts Discarded
- Number of passive connection requests discarded.
- Timewait Connections Reused
- Number of TCP connections in the TIMEWAIT state that have been reused for connections in the SYN-RCVD state.
- Segments Received
- The total number of segments received. Guideline: This value, when displayed for TCP statistics, includes the number of Remote Direct Memory Access (RDMA) inbound operations that are processed across all SMC-R links. To determine the number of segments that are received on TCP connections that do not traverse SMC-R links, subtract the value for Segments Received displayed under SMCR Statistics from this value.
- Segments Received on OSA Bulk Queues
- The total number of segments received for all connections from the BulkData ancillary input queue (AIQ) of the OSA-Express QDIO inbound workload queueing function. For more information about QDIO inbound workload queueing, see z/OS Communications Server: IP Configuration Guide.
- Header Prediction Ok for ACK
- Number of inbound TCP acknowledgments with successful header prediction.
- Header Prediction Ok for Data
- Number of inbound TCP data segments with successful header prediction.
- Duplicate ACKs
- Number of inbound duplicate TCP acknowledgments.
- Discards for Bad Checksum
- Number of inbound TCP segments discarded due to bad checksum.
- Discards for Bad Header Length
- Number of inbound TCP segments discarded due to bad header length.
- Discards for Data too Short
- Number of inbound TCP segments discarded due to data length shorter than segment length.
- Discards for Old Timestamp
- Number of inbound TCP segments discarded due to old timestamp.
- Segments Completely Duplicate
- Number of inbound TCP segments with all data before current TCP window.
- Segments Partially Duplicate
- Number of inbound TCP segments with some data before current TCP window.
- Segments Completely After Window
- Number of inbound TCP segments with all data after current TCP window.
- Segments Partially After Window
- Number of inbound TCP segments with some data after current TCP window.
- Segments Out of Order
- Number of inbound TCP segments that did not contain the next expected sequence number.
- Segments Received After Close
- Number of inbound TCP segments received after corresponding sockets have been closed.
- Window Probes Received
- Number of inbound TCP segments processed while current receive window size is 0.
- Window Updates Received
- Number of inbound TCP segments that only change receive window size.
- Segments Sent
- The total number of segments sent. Guideline: This value, when displayed for TCP statistics, includes the number of RDMA outbound operations that are processed across all SMC-R links. To determine the number of segments that were sent on TCP connections that do not traverse SMC-R links, subtract the value for Segments Sent displayed under SMCR Statistics from this value.
- Window Updates Sent
- Number of outbound TCP segments that only change receive window size.
- Delayed ACKs Sent
- Number of delayed outbound TCP acknowledgments.
- Resets Sent
- Number of TCP segments sent containing the RST flag.Guideline: This value, when displayed for TCP statistics, includes the number of TCP connections that were using SMC-R links. To determine the number of these segments that were sent for TCP connections that were not using SMC-R links, subtract the value for Resets Sent displayed under SMCR Statistics from this value.
- Segments Retransmitted
- The total number of segments retransmitted.
- Retransmit Timeouts
- Number of TCP retransmit timer pops.
- Connections Dropped by Retransmit
- Number of TCP connections dropped due to retransmit threshold exceeded.
- Path MTU Discovery Retransmits
- Number of outbound TCP segments retransmitted due to path MTU discovery.
- Path MTU Beyond Retransmit Limit
- Number of TCP connections that exceeded path MTU discovery retransmit threshold.
- Window Probes Sent
- Number of outbound window probe requests.
- Connections Dropped during Probe
- Number of TCP connections dropped due to no response while sending window probe requests.
- KeepAlive Probes Sent
- Number of keepalive probe requests. This value includes the number of TCP connections across SMC-R links.
- Connections Dropped by KeepAlive
- Number of TCP connections dropped because of no response when sending keepalive probe requests. This value includes the number of TCP connections across SMC-R links.
- Connections Dropped by Finwait2
- Number of TCP connections dropped because of FINWAIT2 timer expiring before receiving FIN segments. This value includes the number of TCP connections across SMC-R links.
- Configured Ephemeral Ports
- Number of configured ephemeral ports to be assigned for TCP applications.
- Ephemeral Ports In Use
- The number of ephemeral ports currently in use by TCP applications.
- Ephemeral Ports Max Usage
- The highest number of ephemeral ports in use by TCP applications at any time.
- Ephemeral Ports Exhausted
- The number of times a bind() request failed because all available ephemeral ports were in use.
- The following describes the SMC-R statistics that are displayed:
- Current Established SMC Links
- The current number of active SMC-R links.
- SMC Link Activation Time Outs
- The number of times that an attempt occurred to establish an SMC-R link, but the attempt failed because of timeout conditions.
- Active SMC Links Opened
- The number of times that an SMC-R link was established and this stack acted in the server role during link establishment.
- Passive SMC Links Opened
- The number of times that an SMC-R link was established and this stack acted in the client role during link establishment.
- SMC Links Closed
- The number of SMC-R links that were closed.
- Current Established Connections
- The number of TCP connections over SMC-R links for which the current state is either ESTABLISHED or CLOSE-WAIT.
- Active Connection Opened
- The number of times that TCP connections over SMC-R links made a direct transition to the SYN-SENT state from the CLOSED state.
- Passive Connection Opened
- The number of times that TCP connections over SMC-R links made a direct transition to the SYN-RCVD state from the LISTEN state.
- Connections Closed
- The number of TCP connections over SMC-R links that have corresponding sockets closed.
- Segments Received
- The number of Remote Direct Memory Access (RDMA) inbound operations that were processed across all SMC-R links.
- Segments Sent
- The number of RDMA outbound operations that were processed across all SMC-R links.
- Resets Sent
- The number of RDMA outbound operations that contained the abnormal close flag. For information about the abnormal close flag, see z/OS Communications Server: IP Configuration Guide.
- Resets Received
- The number of RDMA inbound operations that contained the abnormal close flag. For information about the abnormal close flag, see z/OS Communications Server: IP Configuration Guide.
- The following describes the UDP statistics displayed:
- Datagrams Received
- The total number of UDP datagrams delivered to UDP users.
- No Port Errors
- The total number of received UDP datagrams for which there was no application at the destination port.
- Receive Errors
- The number of received UDP datagrams that could not be delivered for reasons other than the lack of an application at the destination port.
- Datagrams Sent
- The total number of UDP datagrams sent.
- Configured Ephemeral Ports
- Number of configured ephemeral ports to be assigned for UDP applications.
- Ephemeral Ports In Use
- The number of ephemeral ports currently in use by UDP applications.
- Ephemeral Ports Max Usage
- The highest number of ephemeral ports in use by UDP applications at any time.
- Ephemeral Ports Exhausted
- The number of times a bind() request failed because all available ephemeral ports were in use.