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

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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When configuring DHCP for a datacenter using the remote services, the possible DHCP configurations are as follows:.

1. DHCP Server only, for < 200

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1. VLANs.

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DHCP Server only

1. The DHCP Server listens to all the VLANs. Abiquo recommends that you use a separate DHCP Server (not the Remote Services DHCP Service) in this configuration.

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2. DHCP Server with DHCP Relay

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1. , for < 1000 VLANs. The DHCP relay server listens to all the VLANs and forwards the DHCP requests to the DHCP Server. In this configuration you can use the DHCP server on the Remote Services server. Do not configure support for VLANs on the DHCP Server. 

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2. DHCP Server with

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1. muliptle DHCP Relays

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1. , for > 1000 VLANs. Multiple DHCP relay servers allow you to create large networks in a hierarchical forwarding structure. 

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DHCP Installation Guide

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 How to configure an ESXi host to support VLAN tagging) or RedHat KVM.

To configure a single DHCP server with VLAN support, see see Configuring a DHCP Server. 

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