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====== What Is gPXE? in Brief ====== gPXE is a boot-loader: a program that allows your computer to load either another boot-loader or your Operating System. gPXE, however, allows the computer to boot via a network, rather than a disk. gPXE is the direct descendant of Etherboot; both are part of the Etherboot project, though Etherboot is no longer maintained. ====== Download Protocols ====== gPXE features several download protocols: |TFTP| | |NFS|Not by default| |HTTP| | |HTTPS|Not by default| |FTP|Not by default| |TFTM|Not by default| |SLAM|Not by default| |FSP|Not by default| ====== SAN-Boot Protocols ====== gPXE features two SAN-booting technologies: |iSCSI| |AoE| ====== Name Resolution Protocols ====== gPXE features name resolution protocols: |DNS| | |NMB|Not by default| ====== Booting Protocols ====== gPXE is a boot-loader that is capable of booting programs of several different formats: |NBI (Network Boot Image)| | |ELF| | |FreeBSD Kernel| | |Multiboot Specification-Conformant Image| | |a.out| | |WinCE| | |PXE| | |gPXE Script| | |Linux bzImage (Kernel)| | |COMBOOT/COMBOOT32| | |EFI|Only Applicable on EFI Platform| ====== gPXE Shell ====== gPXE has a command-line interface (CLI), also called a shell, which allows you some manual control over what gPXE does. Shell commands can be grouped together, one per line, into a file called a script. In order for a script to be recognized by gPXE as a bootable image, you must put the following as the first line in the script: #!gpxe Some of the command categories are: |Automatic Booting| |Non-Volatile Option Storage (NVO)| |Option Configuration| |Network Interface Management| |Network Routing Table Management| |Bootable Image Management| |DHCP Configuration| |SAN-Booting| ====== gPXE Formats ====== In order to allow a variety of methods for loading and running gPXE, the core of the program is prefixed by another program which is specific to a particular booting scenario or bootable media. These different prefii are: |ROM|For flashing/burning/programming gPXE onto a chip|


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