I'm trying to set up imaging on another network (branch office) but I'm a bit lost with the dhcp settings..

Little schematic:
PC -- X -- L3 -- L3 -- L3 -- Zen

The PC is connected to a Sonicwall NSA appliance (X) that hops over a couple of layer 3 switches to the Zenworks server.
The Sonicwall is acting as a DHCP server for the PC network, the Zenworks server is configured to use pdhcp as it is not acting as DHCP on the main network it is in.
The sonicwall is configured to allow BOOTP and the Zen server is configured as 'next available server' with no filename. Option 60 is configured as PXEClient.

What am I forgetting ..