DHCP Option - Next-Server

We rely heavily on PXE booting in our environment. As a corporate mandate I have to use my Fortigate as our DHCP server. It works great however I can' t get the DHCP options to redirect to our TFTP server' s IP. My firewall @ home has this setup to define the " next-server" & " filename dhcp" options: http://dl.dropbox.com/u/1445590/junk/pfsense.png I can' t seem to make this work using the FortiOS' s DHCP options. I tried setting Option 66 to 31302e36302e3230312e32 (Translates IP Address 10.60.201.2), and the " Server Name" field gets set correctly but not the " next-server" . When I packet sniff the network is shows the " next-server" option sent from the firewall is it' s own IP which is screwing up this process for us. What am I doing wrong?