[hono222]

You have to make sure you have SecurePlatform Pro installed in order for this to work

IN SYSCONFIG
Add your network connection for the DHCP community sysconfig option 5
Add a new connection option 1 under option 5
Add a new route sysconfig option 6
Add a new network route option 1 under option 6
Set your DHCP Server configuration sysconfig option 7
Add a subnet option 2 under option 7
Set your DHCP Relay configuration sysconfig option 8
Set your DHCP Server option 1 under option 8
Add a DHCP Server option 2 under option 8

YOUR RULE
Source
Your-DHCP-Network
External-Network 0.0.0.0 mask (0.0.0.0)

Destination
Your-DHCP Network
External-Network 0.0.0.0 mask (0.0.0.0)

Service
UDP dhcp-rep-localmodule
UDP dhcp-req-localmodule
UDP dhcp_relay

Also if your are using your external DNS server (not recommended) as the DHCP server you need that ip here as well the service UDP domain-udp look-up port

Let me know if you have problems
Goodluck!

Aloha,
hono222