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Creating networks
Creating a network
When you create a network in private cloud
If it is a private network, it is created in a virtual datacenter context
If it is an IPv4 address
The gateway address is automatically created
The VLAN tag is not allocated until the first VM is deployed
It will be allocated from the rack's VLAN range that should be configured in the switch or network management system
If it is an external, public, or unmanaged network, it is created in a datacenter context
You enter a VLAN tag
This VLAN tag should be already configured in the switch or network management system
It should not be in the range of VLANs that the rack will use for private networks
For external and public networks, the VLAN tag must be configured in DHCP
You can create an IP address or a range of addresses by entering the first address and the number of addresses to create
The IPs in the network are added to the internal IP pool
For external or public network
IPs are marked as available/not available in the internal IP pool
For private network
All IPs are marked as available
Making a network the default VLAN for an enterprise
When you make an external network the default for an enterprise
The default VLAN network ID is added to the enterprise limits for the datacenter
Creating a virtual datacenter
When you create a virtual datacenter for the enterprise
The default enterprise network (e.g. external network) is set as the default for the virtual datacenter
A default private network is created
Purchasing public IPs for a virtual datacenter
When you purchase public IPs for a virtual datacenter
MAC addresses are generated for the network interfaces that will be used by these IPs
IP assignment
The IP assignment process has three main stages: configuration, deploy and power on.
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When a new VM is created in Abiquo
The configuration may include a network interface in any of the Abiquo networks
In VM configuration on the Network tab, the user can create a new IP address in a private or public network
The user can request an automatically generated IP address, to create a network interface
The user can select an existing IP address to create a network interface
For each network interface, Abiquo assigns a unique MAC address
For public networks, the MAC is generated when the NIC is purchased by the virtual datacenter
For external networks, the MAC is generated when the NIC is assigned to the virtual machine
For IPv6 networks, the MAC is used to generate the IP address
The MAC address is included in network configuration that is sent to the hypervisor
Deploying a VM
When the VM is deployed to a hypervisor
If the user did not create a NIC, then Abiquo configures one in the default network (if it is not unmanaged)
The Abiquo Server sends the network configuration to the DHCP Server as a DHCP lease
The IP address is the one assigned when the VM was configured (by the user or Abiquo)
The MAC address was assigned by Abiquo when the VM was configured
The lease may include other information, e.g. one-time API key for Chef configuration
The IP addresses assigned by the DHCP server are static
If the VM is the first in the network
If it is a private network
Schedule resources and automatically select the VLAN tag (see below)
Else
Schedule resources using the VLAN tag reserved by the user when creating the network
Create a new VLAN for this network
in ESX, create a port group for the VLAN
in KVM, create a virtual bridge for the VLAN
Otherwise, attach the NIC to an existing port group/virtual bridge, etc.
Powering on a VM when using DCHP
When a VM is powered on
It broadcasts a request for network configuration using DHCP
The hypervisor passes the request over the service network
The service network is a trunk connection between hypervisors and DHCP for VLAN networks
If you are using a DHCP Relay Server
the relay forwards the request to the DHCP Server
Otherwise
the DHCP Server receives the request directly
The DHCP Server sends a lease to the service network
If you are using a DHCP Relay
the relay forwards the request to the VM
Otherwise
the VM receives the request directly over the service network
The VM can now use its network configuration
See Configuring DHCP and DHCP troubleshooting 
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With DHCP Relay
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VLAN Allocation
Abiquo will only automatically allocate VLAN tags for Abiquo private networks that are isolated within virtual datacenters within the configured range. You must configure VLAN tags in the switch with ports in "access mode" for connections to external, public and unmanaged networks.
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