[syslinux] Pre-PXE loader

[Roger Binns]

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I am frequently in a situation where I have a machine sitting behind NAT
which means it doesn't see the real network DHCP server and PXE
parameters.  Two examples:

 * Using VirtualBox with default NAT networking (bridging is tedious)
 * A machine that normally uses wireless but is being NAT'ed to real
network for OS installation

I have been looking for and failed to find some sort of booting solution
that would try to do DHCP, let me manually enter/override network and
PXE configuration then proceed to do a PXE boot.  I would need to be
able to boot this solution via PXE itself (for VirtualBox) or by CD.

I couldn't see how to do interactive input with gpxe and pxe/syslinux
seems to have most of the pieces in place but appears to need more code
written.

Roger
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