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PXEBOOT(8)		  BSD System Manager's Manual		    PXEBOOT(8)

     pxeboot --	Preboot	Execution Environment (PXE) bootloader

     The pxeboot bootloader is a modified version of the system	third-stage
     bootstrap loader(8) configured to run under Intel's Preboot Execution En-
     vironment (PXE) system.  PXE is a form of smart boot ROM, built into In-
     tel EtherExpress Pro/100 and 3Com 3c905c Ethernet cards, and Ethernet-
     equipped Intel motherboards.  PXE supports	DHCP configuration and pro-
     vides low-level NIC access	services.  The pxeboot bootloader retrieves
     the kernel, modules, and other files either via NFS over UDP or by	TFTP,
     selectable	through	compile-time options.  In combination with a memory
     file system image or NFS-mounted root file	system,	pxeboot	allows for
     easy, EEPROM-burner free construction of diskless machines.

     The pxeboot binary	is loaded just like any	other boot file, by specifying
     it	in the DHCP server's configuration file.  Below	is a sample configura-
     tion for the ISC DHCP v2 server:

	   option domain-name "";
	   option routers;
	   option subnet-mask;
	   option broadcast-address;
	   option domain-name-servers;
	   server-name "DHCPserver";

	   default-lease-time 120;
	   max-lease-time 120;

	   subnet netmask {
		  filename "pxeboot";

     pxeboot recognizes	next-server and	option root-path directives as the
     server and	path to	NFS mount for file requests, respectively, or the
     server to make TFTP requests to.  Note that pxeboot expects to fetch
     /boot/loader.rc from the specified	server before loading any other	files.

     In	all other respects, pxeboot acts just like loader(8).

     As	PXE is still in	its infancy, some firmware versions may	not work prop-
     erly.  The	pxeboot	bootloader has been extensively	tested on version 0.99
     of	Intel firmware;	pre-release versions of	the newer 2.0 firmware are
     known to have problems.  Check with the device's manufacturer for their
     latest stable release.

     For further information on	Intel's	PXE specifications and Wired for Man-
     agement (WfM) systems, see


     The pxeboot bootloader first appeared in FreeBSD 4.1.

     The pxeboot bootloader was	written	by John	Baldwin	<> and
     Paul Saab <>.  This manual page was written by Doug White

BSD				  May 1, 2000				   BSD


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