There is some information on PXE boot in the Wiki: http://www.knoppix.net/wiki/PXE_FAQ

Things are very simple if the client's BIOS supports PXE as a boot option. Just launch Knoppix' terminal server script on the server and set the client to boot off the network. It even works if you have a separate DHCP server in your network (e.g., a router) because the terminal server script by default assigns IP addresses in a range that is rarely used (192.168.0.240 and higher).