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DHCP

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infrasctructure

When configuring DHCP for a datacenter using the remote services, the possible DHCP configurations are as follows.the DHCP infrastructure, there are several choices depending on the number of VLANs in the environment:

1. DHCP Server only, for < 200 VLANs.
   The DHCP Server listens to all the VLANs. Abiquo recommends that you use a separate DHCP Server (not the Remote Services DHCP Service) in We recommend using a dedicated DHCP Server for this configuration.
   
   

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2. DHCP Server with DHCP Relay, for < 1000 VLANs.
   The DHCP relay server listens to on 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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3. DHCP Server with muliptle multiple DHCP Relays, 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.a VLAN (DHCP Relay or DHCP Server) must have one interface with IP in the VLAN that will identify the VLAN in the DHCP Server. 

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 - appliances 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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