[Help?] DHCP Relay to DHCP Server on different VLAN.

Running into a bit of a snag here, despite my best efforts. Wondering if anyone had some insight as to what I may have missed.

Current network topology:

• Sonicwall serving DHCP for:
  • a workstation VLAN(110) 10.0.42.0 (interface X0:V110)
  • a server VLAN(1) 10.0.41.0 (interface X0)
  • other VLANs that don't factor into this equation
• Stack of SG300s handling switching for multiple VLANs

Desired network topology:

• Sonicwall serving DHCP for all VLANS except for 110.
• SG300s forwarding DHCP traffic for VLAN 110 to AD Domain Controllers on the 10.0.41.0 network

I have configured DHCP server roles, scopes and failover on the DCs, and enabled the scopes. Everything on the DC end is configured as expected.

Process:

1. disabled DHCP on the Sonicwall for VLAN110
2. on the SG300s:

• IP Configuration -> DHCP Relay -> Properties -> Enabled DHCP relay, and added the DCs to the relay server table.
• IP configuration -> DHCP Relay -> Interface Settings -> enabled DHCP relay for VLAN110

In my mind, this should be configured correctly and working as of now. Unfortunately, it looks like the DCs are not seeing any network traffic related to DHCP.

I set up a monitor port on the switch, and looked at traffic for VLAN110 via wireshark:

• I can see DHCP requests being sent

Moved the monitor port over to VLAN1:

• I can still see DHCP traffic

Running wireshark directly on the DC itself:

• no DHCP traffic.

Verified no ACLs on the switch are preventing this. No windows firewall is preventing this. I can ping directly fromt he switch stack to the DCs, so routing is in place.

Appreciate any thoughts or comments on something I may have missed.