DHCP replies ?

Hello,

	I have created a script that monitors DHCP replies on a network.   Run 
from cron every X, it will send out a DHCP request and wait up to 30 
seconds for DHCP replies.

It then compares the replies and creates a checksum. If the checksum 
ever differs it sends a notification via e-mail with a small report.

Now it works great except that is appears some times out windows DHCP 
server will send a reply missing some options.

For example a standard reply on the network has the following information:

client IP address
name servers
default route
net mask
server id
broadcast
domain name

But once in a while a DHCP offer will show up containing only the 
following information:

client IP address
default route
net mask

I am assuming this would be caused by the client not requesting all that 
information ? Does any else know of anything like this ?

Michael