[gPXE] Alternative http image location

[Shao Miller]

Randy McAnally wrote:
>
> I'm using it now but for some reason I can only load files (via http 
> uri) from
> the TFTP server IP, no other IP works even on the same subnet.
>
Before loading PXELINUX from gPXE, you could investigate your gPXE 
environment with the Control-B CLI and commands such as 'route'.  You 
could also test downloading a file from that CLI versus from PXELINUX to 
determine if there's a difference there.  Similarly, you can try 
downloading from a running OS somewhere, to rule out web-server or 
firewall configuration error.

You might also enjoy PXELINUX' DHCP options 209 and 210, where you can 
set a default prefix with 210 which PXELINUX will use for relative paths 
specified in any config-files.  Documentation there is in 
syslinux/doc/rfc5071.txt

Check to be absolutely sure that your PXELINUX is a version 
greater-than-or-equal-to 3.70, which is when gPXE-provided HTTP support 
was included.  The fact that you can download successfully from the TFTP 
server only might hint that you are actually downloading via TFTP due to 
an older version, perhaps...  Worth checking what happens if TFTP is not 
running or the files in the TFTP service directory are removed!

- Shao Miller
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