Using ISC dhcpd you can't.
From the FAQ
-------------------------------------------------------------
Can I specify the domain suffix search order?
Q: Can I specify the domain suffix search order?
A: No. If you want to send a single domain name, use the domain-name option.
The current DHCP spec doesn't support specifying a domain suffix search
list.
Q: Can I specify the domain suffix search order?
A: You can use a WINS server to supply this information to Windows clients
and then have the DHCP server point them at the WINS server for this
information. It's a two-step process, but should work. If you don't have an
NT box handy for running a WINS server, then you can use the freely
available Samba tool (http://samba.anu.edu.au/samba/) to setup a WINS server
on a UNIX machine.
-----------------------------------------------------------------
Don't know about other dhcp servers..
>> now what I want is also to search blah2.blahdeblah.com
>> is this possible (i.e. I don't want no theory, has someone
> done this ?)
>
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