IPv6 and Netstat

• To accommodate full IPv6 address information, Netstat reports were redesigned. If the TCP/IP stack is IPv6 enabled, reports are displayed in a different format than with IPv4. This different format might affect applications that parse Netstat output. The same considerations apply to applications that use IP addresses in their automation because IP addresses now have a longer size. If the TCP/IP stack is not IPv6 enabled, the report format is changed only when the FORMAT LONG parameter is specified on the Netstat command or on the IPCONFIG statement in the TCP/IP profile.
• IPv6 statistic information is added to the Netstat STATS/-S report.
• Information regarding whether the stack is IPv6 enabled is added to the Netstat UP/-u report.
• For a server that opens an AF_INET6 socket, binds to the IPv6 unspecified address (in6addr_any), and does a socketopt with IPv6_V6ONLY against the socket, the local address information in the connection-related reports contains the text (IPV6_ONLY).

 MVS TCP/IP NETSTAT CS V1R6       TCPIP NAME: TCPCS            17:40:36
 User Id  Conn     State  
 -------  ----     -----      
 FTPABC1  00000021 Listen    
   Local Socket:   0.0.0.0..21     
   Foreign Socket: 0.0.0.0..0   
 FTPDV6   00000086 Listen      
   Local Socket:   ::..21 (IPv6_ONLY)  
   Foreign Socket: ::..0    

For more detailed information, see z/OS Communications Server: IP System Administrator's Commands.