Cannot get DHCP from VLAN sub-interface in Router-on-a-Stick configuration

Elexwiz

We have a TZ-570 with a Sonicwall 24-port switch coming off the X7 interface and going to Port 1 on the switch. The IP of the interface is 192.168.1.1/24. The X7 is s a common uplink (MGMT) port.

We need to VLAN out 3 ports (22-24) on the switch. I created a sub-interface VLAN on X7, IP 192.168.100.1/29 with DHCP. I edited port 22 on the switch as follows: Portshield = X7, VLAN = 100, Type = Access. The VLAN View on the switch correctly shows Port 1 as a Trunk.

According to Sonicwall's documentation, Port 1 on the switch is automatically a Trunk port because it is a management port. In fact, I cannot edit settings for Port 1 (as expected). Unfortunately, no devices will pull a 100.x IP from port 22. I've compared the Access, NAT, and Routing Rules to other VLAN sub-interfaces on other ports, and the types of rules match (all default rules created when I established the VLAN). Do I need a custom rule for DHCP? What am I missing??

Here is the documentation and guides I've been using.

Router on a Stick configuration using SonicWall Switch | SonicWall

How can I configure Sub-Interfaces? | SonicWall

Thank you for your time.

光热斗

Did you set up your DHCP server on the Firewall or on the switch?

If it the DHCP server is on the Firewall, make add ip-helper command for your VLAN