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DNSMASQ DHCP with Multiple VLANS --- How to identify the originating VLAN?

jp flag

I'm curious as to what best practice would be when serving DHCP to multiple VLANs from a single DNSMASQ instance.

(The DNSMASQ server is a KVM guest.)

Do I:

A: Create a virtual NIC on the DNSMASQ server for each VLAN and serve an address range based on incoming NIC?

or

B: Create a dnsmasq tag for each dhcp-circuitid provided by the DHCP Helper on each VLAN?

or

C: Is there an simpler way to achieve this? Assuming the VLANs are broken up into subnets, can dnsmasq know what range to give out, solely based on the requesting IP of the DHCP Helper?

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