ILO is a small microcontroller in the server, which is running even when the server is powered off. It stops only when you pull all the power cables out. The microcontroller can even command the server to reset, power off or power on. You can also remotely access the server's display and keyboard through the ILO controller.
If the server crashes or has hardware problems, you can connect to the server through ILO, command the server to restart and then watch the BIOS messages to see what kind of maintenance is needed. This is very useful if the server is in a faraway location.
The ILO network port is for remote management of the server: if you connect to the ILO port, you can access the server through ILO. However, the programs running in the server cannot make connections through the ILO network port.
When the server is booting, ILO will prompt you to press a key (F8, I think) to change ILO settings. From there, you can set up network addresses, usernames and passwords for ILO connection. For operating systems that allow text-based access (Linux, SCO Unix and such like) this is all you need to be able to manage your server remotely. If you need graphics-based remote access, you need to install ILO drivers for your OS to be able to control the OS remotely through ILO.
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