prevent ip conflict in dhcp client

[s m]

hello all

i have a question about dhcp client. i want to know if there is any way to
understand the ip address which is offered by server before it assigned to
the interface.
i have a freebsd system which one of its interfaces should get ip address
from dhcp server whereas other interfaces have ip addresses and their ip
address change many times. so i want to prevent ip conflict.  is there any
way to prevent ip conflict in this situation?
i think the best way is to know the ip address which is offered by dhcp
server before assigning it to interface  and check if it has conflict with
others or not. is it possible? if yes, how i can do this?

any comments or hints are appreciated.
thanks in advance
SAM