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Table Of Contents
Network Boot Background Information
Understanding the network boot process can help you during troubleshooting.
TFTP Server
Trivial File Transfer Protocol (TFTP) is similar to the FTP service, and is typically used only
for network booting systems or loading firmware on network devices such as routers. TFTP is
available on Linux and Windows.
n Most Linux distributions include a copy of the tftp-hpa server. If you require a supported
solution, purchase a supported TFTP server from your vendor of choice. You can also acquire
a TFTP server from one of the packaged appliances on the VMware Marketplace.
n If your TFTP server runs on a Microsoft Windows host, use tftpd32 version 2.11 or later. See
http://tftpd32.jounin.net/.
SYSLINUX and PXELINUX
If you are using PXE in a legacy BIOS environment, you must understand the different boot
environments.
n SYSLINUX is an open-source boot environment for machines that run legacy BIOS firmware.
The ESXi boot loader for BIOS systems, mboot.c32, runs as a SYSLINUX plugin. You can
configure SYSLINUX to boot from several types of media, including disk, ISO image, and
network. You can find the SYSLINUX package at http://www.kernel.org/pub/linux/utils/boot/
syslinux/.
n PXELINUX is a SYSXLINUX configuration for booting from a TFTP server according to the
PXE standard. If you use PXELINUX to boot the ESXi installer, the pxelinux.0 binary file,
mboot.c32, the configuration file, the kernel, and other files are transferred by TFTP.
Note VMware builds the mboot.c32 plugin to work with SYSLINUX version 3.86 and tests PXE
booting only with that version. Other versions might be incompatible.
The Open Source Disclosure
Package for VMware vSphere Hypervisor
includes bug fixes for SYSLINUX version 3.86.
iPXE
iPXE is open-source software that provides an implementation of HTTP. You can use the software
to perform an initial boot. For more information, see https://ipxe.org/.
VMware includes a build of iPXE as part of Auto Deploy. The source tree for this build is available
in
The Open Source Disclosure Package for VMware vCenter Server
.
UEFI PXE and UEFI HTTP
Most UEFI firmware natively includes PXE support that allows booting from a TFTP server. The
firmware can directly load the ESXi boot loader for UEFI systems, mboot.efi. Additional software
such as PXELINUX is not required.
VMware ESXi Installation and Setup
VMware, Inc. 99