dhcpd setting for booting clients from a 4.2 server and a 5 server

[Krsnendu dasa]

> NB: some PXE clients I've found ignore the next-server directive.  Just
> something to watch out for -- particularly with an on-board network card
> that does PXE.

Unfortunately that is the case with my clients. It works fine for the
vmclient but not the physical ones.

Is there any way around that. Will using the group setting help?