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Per Alex Williamson <alex.williamson@redhat.com>: For discovery, both the DHCP and PXE specs suggest timeouts of 4, 8, 16, and 32 seconds. This gives us a maximum timeout of 60 seconds, versus the current timeout of 15 seconds at timeouts of 1, 2, 4, and 8 seconds. On the request phase, the specs are quite different. RFC2131 for DHCP suggests the same intervals as above for discovery, while the PXE spec recommends intervals of 1, 2, 3, and 4 seconds. Our timer only wants to do exponential back-off, so we compromise and adjust to intervals of 1, 2, 4, and 8 seconds. PXE boot server discovery appears to want the same timeouts as the DHCP request phase.
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org