How to configure DHCP client when there are multiple DHCP servers on network

How to configure DHCP client when there are multiple DHCP servers on network

I'm a first timer configuring isc-dhcp-server. I'm using my Ubuntu 12.04
laptop as the server and a CentOS 6.4 guest as the client (using
VirtualBox).
My laptop has two interfaces - eth0 and wlan0 - of which I want to serve
DHCP requests over eth0. This is fine, but the network I'm on has already
two different DHCP servers - 1 on the ADSL router, and 1 on the wireless
router that is NATed to the ADSL router.
In order for my laptop to provide an IP address to the guest, I needed to
disable DHCP on the ADSL router (since it is on the same network as my
eth0) - this makes sense since I assume the previous DHCP requests are
cached.
My question is - is there a way to force which DHCP server a client
sources it's configuration from? I want to still use pooling, not static
assignment on the server side.