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Chapter 2. TCP/IP: Operation, Management, and Advanced
Topics
This chapter discusses managing your network by using the NETSTAT command,
and the maintenance of host tables. In addition, this chapter covers other topics
beyond those that are required to configure and use TCP/IP on iSeries 400. This
information may help you to understand and maximize your usage of the iSeries
TCP/IP support.
TCP/IP on an iSeries server can also be managed by Simple Network Management
Protocol (SNMP). For information about SNMP, see resources in the Information
Center: Supplemental Manuals.
Network Status
The network status function on the server allows you to get information about the
status of TCP/IP network interfaces, routes, and connections on your local system.
This function also allows you to end TCP/IP connections and to start or end
TCP/IP interfaces.
Note: Network status functions may also be administered by Operations
Navigator. Use the Operations Navigator interface for these functions if it is
installed on your system. See the Operations Navigator
(http://www.as400.ibm.com/oper_nav/index.htm) Web page for more
information.
NETSTAT displays the current TCP/IP protocol stack information. This
information does not necessarily match the configuration data you see when using
the Configure TCP/IP (CFGTCP) menu. In most cases, the NETSTAT command
displays more information than the configuration data. In some cases, the
configuration data might even change.
The reason for such a change is that the iSeries TCP/IP dynamically creates some
information, such as *DIRECT routes, when TCP/IP starts. A change may also
occur if the configuration data that was sent to TCP/IP when it starts is changed
dynamically by TCP/IP applications that run after you start TCP/IP. Several types
of processing alter the initial TCP/IP configuration:
v Internet Control Message Protocol (ICMP) requests
v Sockets ioctl system calls
v Simple Network Management Protocol (SNMP) requests
v iSeries TCP/IP internal processing
Work with TCP/IP Network Status Menu
The Work with TCP/IP Network Status menu allows you to work with the various
network status functions.
To display the Work with TCP/IP Network Status menu, take these steps:
1. Type the WRKTCPSTS (Work with TCP/IP Network Status) command or the
NETSTAT (Network Status) command.
2. Press the Enter key. (See Figure 24 on page 34.)
© Copyright IBM Corp. 1997, 2001 33