[syslinux] Can PXElinux be used to dynamically pass DHCP option 252 to a PXE client?

[Shao Miller]

Andrew Stuart wrote:
>
> ...I would suspect implementing this DHCP wide would cause
> all sorts of issues.
>

My impression of the original e-mail was that the request was to have a 
different DHCP option 252 based on a menu choice.  While PXE itself does 
include a means for a menu system, it seemed that Martijn was asking in 
regards to using the PXELINUX menu system.  If this is true, then 
Martijn wasn't looking to hand out DHCP option 252 from the DHCP 
service, but was interested in spoofing or modifying the options as seen 
by the Microsoft boot-loader consumer.

Some of the responses to the original e-mail indicates possibilities for 
this.

> I am one of the many of us annoyed by the delay, and would love to
> remove it, but not at the cost of having peoples browsers blow up.
>

Again, if you set 252 from somewhere other than the DHCP service, this 
is a non-issue for normal DHCP clients.  Typically an OS will redo its 
DHCP transaction rather than use what was gained through the PXE DHCP 
one.  An exception would be in a SAN-boot scenario where the OS might 
very well use the original PXE DHCP transaction and set those params 
statically on the network interface for the duration of the booted 
session, or until the user or a "helpful" OS service changes it.

> I wonder if restricting this to the PXEClient Class would still work.
>

This should work, since an OS typically does its own DHCP transaction.

- Shao Miller