Predefined.. as in an address that doesn't belong to your ethernet card? I don't know that dhcpclient would have a feature where you could spoof the arp packet... that's the only way it can be done I believe. Programs like arpspoof, by dugsong, which is included in the dsniff package can do that. I don't see a program like dhcpclient doing it. That isn't much help, and I'm probably wrong, or misunderstanding, but I'd say it can't be done by normal means.
Waiting to be corrected.