On Thu, Jan 26, 2017 at 10:22 PM, <[email protected]> wrote:
> Please can anyone explain what the 'boot_file' parameter is specifically
> for and what udhcp does with it ?
> Also, what is the difference between that 'boot_file' parameter and then the
> optional 'opt bootfile <filename>' parameter ?
There is a fixed-size 128-byte boot_file field in DHCP packets,
it is a feature inherited from BOOTP
(new, DHCP options use variable-sized storage in the packet).
If it is not starting with zero byte, udhcpc (client) exports it
into $boot_file env var for its script (the -s SCRIPT thing)
to use in whatever way SCRIPT wants.
udhcpd (server) will fill it with zeroes inlees you specify
boot_file FILE
in udhcpd.conf.
In the same file,
opt bootfile FILE
sets the value of DHCP option 67, not of the boot_file field.
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