Netstat operator commands (DISPLAY TCPIP,,NETSTAT)

Table 1 lists the new and updated Communications Server IP Netstat operator command DISPLAY TCPIP,,NETSTAT. See Table 1 for the other Communications Server IP operator command entries.

See z/OS Communications Server: IP System Administrator's Commands for more detailed information about the Communications Server IP operator commands.

All parameters in the following table are for the DISPLAY TCPIP,,NETSTAT operator command.

Table 1. Summary of new and changed Communications Server Netstat operator commands (DISPLAY TCPIP,,NETSTAT)
Parameters Release Description Reason for change
ACCESS,NETWORK V2R1 The report displays the setting of the new CACHEALL, CACHEPERMIT, and CACHESAME parameters on the NETACCESS statement. Improve auditing of NetAccess rules
Start of changeALLEnd of change Start of changeV2R2End of change Start of change
  • Displays Shared Memory Communications - Direct Memory Access (SMC-D) information for TCP connections.
  • Accepts the SMCID filter to display the TCP connections that are associated with a specific local SMC-D link identifier.
End of change		 Start of changeShared Memory Communications - Direct Memory AccessEnd of change
V2R2 Displays new field TcpPrf3. This field is to be used only for diagnostic purposes under the direction of IBM Service personnel. VIPAROUTE fragmentation avoidance
V2R2
  • Updated the TcpPrf field by adding the description of the dynamic right sizing (DRS) eligible flag bit.
  • Added new TcpPrf2 field, which describes outbound right sizing (ORS) flag bits.
  • Added new DelayAck field, which indicates how the TCP/IP stack controls the transmission of acknowledgments for packets received with the PUSH bit on in the TCP header.
 TCP autonomic tuning enhancements
Start of changeV2R2End of change Start of changeNew SMC Information section displayed for connections in Listen state.End of change Start of changeShared Memory Communications over RDMA enhancementsEnd of change
ALL (continued) V2R1 Added new StartDate and StartTime fields. These fields provide the date and time for the last of one of the following events:
  • UDP bind
  • TCP bind
  • TCP listen
  • TCP connection establishment
 Socket establishment time for Netstat ALL/-A
V2R1 Displays the names of the routing policy rule and the policy-based routing table used by IP routing for an IPv6 connection. IPv6 support for policy-based routing
V2R1
  • Displays Shared Memory Communications through Remote Direct Memory Access (SMC-R) information for TCP connections.
  • Accepts a new SMCID filter to display only the TCP connections associated with a specific SMC-R link group or SMC-R link identifier.
 Shared Memory Communications over Remote Direct Memory Access
V1R13 The output line that begins with the Last Touched field is now displayed after the output lines for the Bytes, Segments, and Dgram In and Out counters Release update
V1R13 Report is enhanced to display the following indicators:
  • An indicator of whether a TCP connection's send data flow is stalled, SendStalled
  • An indicator of whether a TCP server is experiencing a potential connection flood attack, ConnectionFlood
 Expanded Intrusion Detection Services
Start of changeALLCONNEnd of change Start of changeV2R2End of change Start of changeAccepts the SMCID filter to display the TCP connections that are associated with a specific local SMC-D link identifier.End of change Start of changeShared Memory Communications - Direct Memory AccessEnd of change
V2R1 Accepts a new SMCID filter to display only the TCP connections that are associated with a specific SMC-R link group or SMC-R link identifier. Shared Memory Communications over Remote Direct Memory Access
ARp V1R13 Displays ARP cache information for an IQDX interface HiperSockets optimization for intraensemble data networks
Start of changeCONFIGEnd of change Start of changeV2R2End of change Start of change
  • Displays new SMCD parameter information in the GLOBALCONFIG section.
  • Displays new DYNAMICXCF SMCD subparameter information in the IPCONFIG and IPCONFIG6 section.
End of change		 Start of changeShared Memory Communications - Direct Memory AccessEnd of change
CONFIG (continued) V2R2 New field, AdjustDVIPAMSS, under the Global Configuration Information section, displays the setting of the new ADJUSTDVIPAMSS parameter from the GLOBALCONFIG statement. VIPAROUTE fragmentation avoidance
V2R2 New SMCGlobal, AutoCache, and AutoSMC fields under the Global Configuration Information section, display the setting of the new SMCGLOBAL parameter and its subparameters from the GLOBALCONFIG statement. Shared Memory Communications over RDMA enhancements
V2R2 A new value of Auto can be displayed for the DelayAck field under the TCP Configuration Table section to support the new AUTODELACKS parameter from the TCPCONFIG statement. TCP autonomic tuning enhancements
V2R1 Added the following fields to the TCP CONFIGURATION TABLE section:
  • TimeWaitInterval
  • RetransmitAttempt
  • ConnectTimeOut
  • ConnectInitInterval
  • Nagle
  • KeepAliveProbes
  • KAProbeInterval
  • QueuedRTT
  • FRRThreshold
  • DefltMaxSndBufSize
 Enhanced TCP protocol configuration options and default settings
V2R1 The QDIOAccel indicator reflects "Yes" or "SD only" when IP Security is operational. IP Security introduces additional reasons that QDIOAccel might run in the "SD only" mode. QDIO acceleration coexistence with IP filtering
V2R1 The SELECTIVEACK field is added to the TCP CONFIGURATION TABLE section. TCP support for selective acknowledgements
CONFIG (continued) V2R1 This report displays information about the EPHEMERALPORTS parameter on TCPCONFIG and UDPCONFIG. User control of Ephmeral Port Ranges
V2R1 This report displays information about the SOURCEVIPAINTERFACE parameter on IPCONFIG. IPv4 INTERFACE statement for HiperSockets and Static VIPAs
V2R1
  • Displays new SMCR parameter information in the GLOBALCONFIG section.
  • New SmcrGrpStats field in the Type 119 portion of the SMF parameters section indicates whether SMC-R link group statistics records (SMF subtype 41) are collected.
  • New SmcrLnkEvent field in the Type 119 portion of the SMF parameters section indicates whether the following SMF records are collected:
    • SMC-R link start (SMF subtype 42)
    • SMC-R link end (SMF subtype 43)
 Shared Memory Communications over Remote Direct Memory Access
V1R13 New field AutoIQDX added to the Global Configuration section HiperSockets optimization for intraensemble data networks
V1R13
  • Displays whether checksum offload is globally enabled for IPv4 or IPv6 OSA-Express QDIO interfaces.
  • Displays whether segmentation offload is globally enabled for IPv4 or IPv6 OSA-Express QDIO interfaces.
 OSA-Express4S QDIO IPv6 checksum and segmentation offload
V1R13 The IgRedirect field in the IPv6 Configuration Table section of the report is enhanced. A value of Yes can now indicate that Intrusion Detection Services (IDS) policy is in effect to detect and discard ICMP Redirects. Expanded Intrusion Detection Services
Start of changeCONNEnd of change Start of changeV2R2End of change Start of changeAccepts the SMCID filter to display the TCP connections that are associated with a specific local SMC-D link identifier.End of change Start of changeShared Memory Communications - Direct Memory AccessEnd of change
V2R1 Accepts a new SMCID filter to display only the TCP connections that are associated with a specific SMC-R link group or SMC-R link identifier. Shared Memory Communications over Remote Direct Memory Access
Start of changeDEvlinks End of change Start of changeV2R2End of change Start of change
  • Displays SMC-D information for OSD and HiperSockets interfaces.
  • Accepts the SMCID filter to display devices that are associated with a specific SMC-D local link identifier.
  • Accepts the SMC modifier to display detailed SMC-D information about active internal shared memory (ISM) interfaces and their associated SMC-D links.
  • Accepts the new PNETID modifier to display information about interfaces with a PNETID value, or information about interfaces with a specific PNETID value.
End of change		 Start of changeShared Memory Communications - Direct Memory AccessEnd of change
V2R2 The following new values can be displayed in the Redundancy field in the SMC Link Group Information section:
  • Partial (Single local PCHID and port)
  • Partial (Single local PCHID, unique ports)
 Shared Memory Communications over RDMA adapter (RoCE) virtualization
DEvlinks (continued) V2R1 Displays an IP address of 0.0.0.0 for IPAQENET interfaces that are defined with the TEMPIP parameter. Enable DHCP clients on OSA Interfaces
V2R1
  • Displays Shared Memory Communications over Remote Direct Memory Access information for OSD interfaces.
  • Accepts a new SMCID filter to display only the devices that are associated with a specific SMC-R link group or SMC-R link identifier.
  • Accepts a new SMC modifier to display detailed SMC-R information about active RNIC interfaces and their associated SMC-R links and link groups.
 Shared Memory Communications over Remote Direct Memory Access
V2R1
  • This report displays information about IPv4 HiperSockets interfaces that are configured with the INTERFACE statement for IPAQIDIO.
  • This report displays the datapath address and TRLE name for IPAQIDIO6 interfaces, and IPAQIDIO interfaces defined by the INTERFACE statement.
  • This report displays information about IPv4 static VIPA interfaces that are configured with the INTERFACE statement for VIRTUAL.
  • The INTFNAME/-K filter accepts a HiperSockets TRLE name that allows for the display of all interfaces for a HiperSockets TRLE.
 IPv4 INTERFACE statement for HiperSockets and Static VIPAs
DEvlinks (continued) V1R13
  • Displays whether checksum offload is enabled for an IPAQENET or IPAQENET6 interface.
  • Displays whether segmentation offload is enabled for an IPAQENET or IPAQENET6 interface.
 OSA-Express4S QDIO IPv6 checksum and segmentation offload
V1R13 Displays information about IQDX interfaces. HiperSockets optimization for intraensemble data networks
HOme V2R1 Displays a flag value of I/Internal for IPAQENET interfaces that are defined with the TEMPIP parameter. Enable DHCP clients on OSA Interfaces
V2R1 The INTFNAME/-K filter accepts a HiperSockets TRLE name that allows for the display of all interfaces for a HiperSockets TRLE. IPv4 INTERFACE statement for HiperSockets and Static VIPAs
IDS V1R13 Report is enhanced to display the following items:
  • The ICMPv6 scan rule name in the Scan Detection section
  • Information about new attack types
  • The number of TCP servers under a potential connection flood attack, ServersInConnFlood
  • The number of TCP connections whose send data flow is stalled, TCPStalledConns
  • The percentage of TCP connections whose send data flow is stalled, TCPStalledConnsPct
  • An indicator of whether a TCP server is experiencing a potential connection flood attack, ConnFlood in the Intrusion Detection Services TCP Port List section
  • Both IPv4 and IPv6 addresses in the IP address fields
 Expanded Intrusion Detection Services
V1R13 Report is enhanced to display information about new attack types. Intrusion Detection Services support for Enterprise Extender
ND V1R13 Displays neighbor cache information for an IQDX interface. HiperSockets optimization for intraensemble data networks
PORTLIST V2R2 Start of changeDisplays a new flag, M, to indicate whether the port or port range is explicitly enabled for SMC-R and SMC-D.End of change
  • Shared Memory Communications over RDMA enhancements
  • Start of changeShared Memory Communications - Direct Memory AccessEnd of change
Start of changeV2R2End of change Start of changeStart of changeFlag N is enhanced to indicate whether the port or the port range is explicitly disabled for SMC-R and SMC-D.End of changeEnd of change Start of changeShared Memory Communications - Direct Memory AccessEnd of change
V2R1 Displays a new flag, N, to indicate whether the port or the port range is explicitly disabled for SMC-R. Shared Memory Communications over Remote Direct Memory Access
ROUTe V2R1 When the PR=ALL or PR=prname modifier is used to display a policy-based routing table, IPv6 routes are included in the report. IPv6 support for policy-based routing
Start of changeSTATSEnd of change Start of changeV2R2End of change Start of changeDisplays a new SMCD statistics section. The SMC-D statistics are displayed when no PROTOCOL modifier is specified, or when PROTOCOL=TCP is specified as the modifier value.End of change Start of changeShared Memory Communications - Direct Memory Access End of change
V2R1 Displays a new SMCR statistics section. The SMC-R statistics are displayed when no PROTOCOL modifier is specified, or when PROTOCOL=TCP is specified as the modifier value. Shared Memory Communications over Remote Direct Memory Access
V2R1 This report displays statistics about the usage of ephemeral ports for both TCP and UDP. User control of Ephmeral Port Ranges
V1R13 Report is enhanced to display the following information:
  • The number of TCP connections whose send data flow is stalled, Current Stalled Connections
  • The number of TCP servers under a potential connection flood attack, Current Servers in Connection Flood
 Expanded Intrusion Detection Services
TTLS V2R2 The report output can have a new value of RFC5280 for CertValidationMode. AT-TLS certificate processing enhancements
V2R2 Displays values pertaining to certificate revocation for the new AT-TLS policy agent statements and parameters. AT-TLS certificate processing enhancements
V2R2 New fields SessionID and SIDReuseReq provide the session ID and reuse required indicator for FTP connections. TLS session reuse support for FTP and AT-TLS applications
V2R1 Reports are updated to show four-character cipher code, TLSv1.2 protocol, and new policy attributes AT-TLS support for TLS v1.2 and related features
VIPADCFG V2R2 Report is enhanced to enable the following functions:
  • Support the MAX= parameter
  • Display the "n of m records displayed" message.
Release update
V1R13 The new SAF name field is displayed if the SAF parameter is configured on the VIPARANGE statement. Improved security granularity for VIPARANGE DVIPAs
VIPADyn V2R1 When displaying information about DVIPAs with an origin of VIPARANGE IOCTL, an additional field indicates if the DVIPA was created with affinity. Affinity for application-instance DIVPAs
Parent topic: Operator commands