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The server managing VLANs must be able to listen to VLANs, so it must be a separate physical machine or a virtual machine on a hypervisor with VLAN support, such as VMware ESXi (see see How to configure an ESXi host to support VLAN tagging) or RedHat KVM.
To configure a single DHCP server with VLAN support, see Configuring a DHCP Server.
To install a DHCP Relay server with the Abiquo OVA install - see Automatically Configuring One DHCP Relay Server.
These configurations are designed for multiple VLAN networks, which by definition have separate VLAN tags and isolate DHCP broadcasts. The server managing VLANs (DHCP Relay or DHCP Server) must have one VNIC or NIC with an IP address for each VLAN that will identify the VLAN to the DHCP Server. The DHCP Server and VM communicate through broadcasts, which are also relayed, until the IP address of the VM is set, so there is no specific requirement for the IP address of the VNIC or NIC. However, it is recommended that the IP address range is not part of any other networks. For example, you could use the upper range of the management network. If you have complex requirements, you may need to adapt these configurations.
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