Re: [Etherboot-developers] DHCP option Bootfile name and extension path

[<ke...@et...>]

>> According to man dhcp-options, option 52 is automatically inserted by
>> dhcpd when overflow happens and cannot be configured by the user.
>
>If overflow happens, there is no space for these options in etherboot and the
>loaded images, and my solutions won't work anyway. So, not much point in
>implementing it anywhere yet without an API change.

Presumably what happens is DHCPD sees that the number of options are too
many for the packet, and that the servername and filename fields doesn't
use up all of the 64 and 128 bytes allocated to them respectively and so
decides to recover a few bytes by turning on option 52 and making the
servername and filename fields options instead.

The problem is that it would only recover a small number of bytes, and
that it would be troublesome to test; one would have to put lots of
options for this overflow to be triggered.

So I'm happy to leave it option 52 alone.

In DHCP6, all fields are options so there is no wastage of space due to
fixed length fields. But that's another story for the future.