You can use iSeries™ Navigator to start TCP/IP.
You can use iSeries Navigator to stop TCP/IP. However, if you stop TCP/IP, you are likely to lose your iSeries Navigator connection to the server because iSeries Navigator requires TCP/IP for its own connection. Therefore, in most situations you should use some form of console to start and stop TCP/IP so that you do not lose the very connection you are working with. In this case and depending on your hardware configuration, you can use a Twinaxial console, Operations Console, or the Hardware Management Console (HMC) to start and stop TCP/IP because these consoles do not require TCP/IP to be started in i5/OS®.
To start TCP/IP, follow these steps: