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This course covers how to use System i Navigator to configure and manage TCP/IP on an IBM i system. TCP/IP is unlike most IBM i components in that some TCP/IP functions can only be configured using System i Navigator — no equivalent commands exist.

The course begins by discussing the basic configuration tasks that can be performed using either the text-based (green-screen) interface or System i Navigator. You will see how to use System i Navigator to confirm that all TCP/IP components are installed, to check the status of lines, to create a new TCP/IP interface, and to specify TCP/IP route information.

The course then shows how to identify the domain name servers to be used and how to update the local host table. You will also see how to modify global TCP/IP settings, including port restrictions and the servers to be started automatically.

Basic TCP/IP troubleshooting is covered next. You will see the System i Navigator equivalents of PING, NETSTAT, and TRACERT, as well as other displays that are unique to System i Navigator.

TCP/IP application servers are discussed next. You will see how to start and end individual servers and how to set common configuration options, including whether a server is started automatically when TCP/IP is started and the number of server tasks to be used initially. The course then shows how to configure two servers that can only be set up using System i Navigator: DHCP and DNS.

The course ends by showing how to configure a dial-up line that uses the TCP/IP Point-to-Point Protocol (PPP).

Approximate Study Time: 3 hours


After completing this course, you should be able to:

  • Determine whether the TCP/IP software has been installed on an IBM i system
  • Display the status of the lines used for TCP/IP communication
  • Configure a TCP/IP interface for an IBM i system
  • Specify routing information for hosts not within the local subnetwork
  • Specify the full local domain name for an IBM i system
  • Identify a remote system to be used as a domain name server
  • Restrict access to the TCP/IP ports
  • Control which TCP/IP application servers are started automatically when TCP/IP is started
  • Update the local host table to identify other hosts in the network
  • Use PING to test whether a particular host can be reached from your system
  • Display the route used for a connection
  • Display the IP address associated with a given domain name or vice versa
  • Display the status of all active TCP/IP connections
  • Start and end TCP/IP application servers
  • Specify configuration options for commonly used TCP/IP application servers, including LDP, FTP, Telnet, and SNTP
  • Describe how the HTTP server is configured
  • Describe the function of the System i Access servers
  • Configure a DHCP server to have an IBM i system assign IP addresses for the local network
  • Identify the trade-offs involved in setting the DHCP lease duration
  • Change the DHCP configuration for a subnet
  • Configure a DNS server to have an IBM i system act as the local domain name server
  • Configure a TCP/IP point-to-point connection
  • Start or end a TCP/IP point-to-point connection

Topic Outline

Configuring Interfaces and Routes

Identifying Hosts

Testing Connections

Configuring Application Servers

Configuring DHCP

Configuring a Domain Name Server

Defining a Point-to-Point Connection


This course is intended for IBM i professionals who will install and maintain TCP/IP on an IBM i system.


This course assumes that you are familiar with the concepts and basic operations of IBM i systems. This prerequisite can be satisfied by successfully completing the Introduction to the IBM i Environment series. A knowledge of data communications fundamentals is also required.

The course also assumes you have a basic understanding of TCP/IP concepts and facilities. This prerequisite can be satisfied by successfully completing the previous courses of this series:

You may also have obtained these skills by taking other courses or through relevant work experience.