A user_level x-kernel will usually be configured to use the Unix socket facility to send and receive from the network (see Section 13.1). Example graph.comp and ROM files for building and running such a kernel are found in
/usr/xkernel/user_level/build/Template/example1/.
Note that in this graph.comp file, the lowest protocol in the protocol stack is the SIMETH driver. Refer to Section 13.1 for an explanation of the ROM file's
simeth and arp options.