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For private, external and public networks, Abiquo can manage their corresponding VLANs with an ISC DHCP server. Abiquo recommends one DHCP server per physical datacenter, registered in remote services. For these networks you can use a Remote services DHCP server supplied with Abiquo or other compatible server. If you have many virtual networks, you might need a separate relay server to manage VLANs for the DHCP server. Add the DHCP service to Abiquo when creating or editing a datacenter

For unmanaged networks,  you do not need to configure a DHCP server and you must provide the network addresses to the virtual machines outside of Abiquo and you do not need to configure a DHCP server.

How Abiquo uses DHCP

The connections in DHCP are as follows:

1. When you deploy a virtual machine, Abiquo (Remotes Services) supplies the network settings for the new VM to the DHCP Server.
2. When the new virtual machine powers on, it broadcasts a DHCP request for network configuration.
3. The hypervisor passes the DHCP request through a VLAN to the DHCP server.
4. The DHCP server broadcasts a lease with the network configuration for the virtual machine over the same VLAN

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The DHCP Relay Server (or DHCP Server if no relays are used) 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 How to configure an ESXi host to support VLAN tagging) or RedHat KVM. 

 You can install a DHCP Relay server with the Abiquo OVA install - see Automatically Configuring One DHCP Relay Server.

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