DHCP/VLAN issue

[Dstryr91]

I am trying to migrate from a Sonicwall SoHO 250 to a MX68 and I appear to be running into issues with my config.

My Windows DHCP server sits in VLAN 1 but I can't figure out how to relay to it. I've tried turning off DHCP response from the MX, but then I get nothing.

Any ideas? 

[CptnCrnch]

Have you tried activating DHCP relay on the Vlans your endpoints are behind? You should be able to point them to your DHCP server then.

[Dstryr91]

Probably a poor choice of words on my part, but I can't relay to the DHCP server to VLAN 1 because it sits on that VLAN and I need to be on this VLAN also. The other VLANs work fine, but they are for CCTV (VLAN 30) and VoIP (VLAN 20) traffic. I've tried turning off DHCP response, but then I get no internet access. 

The only way I've had it working is to set up a flat network with DHCP running on the MX.  

[KarstenI · Accepted solution]

Can you explain what you mean with "and I need to be on this VLAN also"?

If your DHCP-server is in VLAN 1 and the client is in VLAN X, then DHCP-relay is the feature to use.

If your client is in the same VLAN as the DHCP-server, no DHCP-functionality is needed on the L3 device (the MX) between them as the DHCP-server can directly give the client its config.

[Arun_TE]

Have you tried as per below doc?

https://documentation.meraki.com/MX/DHCP/Configuring_DHCP_Relay