Epson Net Print automatically uses the printer’s IP address if it is changed with the server’s or router’s DHCP function.
For Windows XP: Click Local printer attached to this computer, clear the Automatically detect and install my Plug and Play printer checkbox, and then click Next.
When studying the IP-communication you will find that it doesn't comply fully with the OSI model but in general it works the same way. You will find plenty of information on the Internet about the OSI model.
On an Ethernet network you do not have to use IP-communication to communicate.
Epson Net Print is a utility program that provides peer-to-peer printing to Epson devices on the TCP/IP network.
This is because all devices that communicate on an Ethernet network have to use Ethernet frames.LPR enhanced printing is faster than LPR standard printing.High-Speed printing: Select the High-Speed Printing (RAW) radio button.The icon shows the network printer name (e.g., EPSONXXXXXX (your printer name)).The printer name can be confirmed on the printer’s control panel or a network status sheet.Select the Create a new port radio button, and then select Epson Net Print Port from the list. LPR enhanced printing: Select the LPR Printing radio button, and then specify the queue name (up to 32 characters).