Creating an automatic network

An automatic network provides DHCP and DNS services for the VMs attached to it, along with outbound connectivity to the public Internet.

To learn more about automatic networks, see Network overview.

To create an automatic network in an environment
  1. Navigate to the environment Network Settings page.

    multiple networks

  2. Click create network Create New Network
  3. In the Create network window, verify the Network type is Automatic. Create Network
  4. Skytap Cloud provides default options for the remaining network properties. You can replace these with custom values. For more information about these fields, see Automatic network properties below.
  5. Click Create Network.
  6. A new network does not have any virtual machines connected to it. To connect VMs to the network, see Attaching VMs to networks.

Automatic network properties

Network name

The name for this network, used for reference and to distinguish it from other networks in the same environment. The maximum length of a network name is 255 characters.

Network type

(read only)

Automatic or Manual.

Notes

  • This field is set when the network is created; it cannot be edited.
  • To switch from a single automatic to a single manual network, delete the automatic network and create a new manual network.
  • For more information about the difference between automatic and manual networks, see Network overview.

Gateway IP address

By default, this is the last address in the subnet (for instance, 10.0.0.254 for a /24 subnet). You can change the gateway IP address if your network requires it.

Domain name

The domain associated with the network. In most cases, you can use the default test.net. However, you may want to change it when connecting these networks to an in-house VPN, or to correspond to a virtualized domain such as a Windows domain, among other cases.

Domain name notes

  • The maximum length of a domain name is 64 characters.
  • A domain name can contain lowercase letters, numbers, and hyphens.
  • A domain name must start and end with letter or number.
  • A domain name can’t begin or end with a period.
  • The domain name can’t be blank.

Subnet and Subnet size

The IP address and subnet mask for the network. The subnet size must be between 16 and 29. For restricted and recommended subnets, see Avoiding restricted subnets and IP addresses.

The subnet and subnet size are automatically calculated to create the Normalized subnet value.

Visible to other networks

Allows this network to be connected to networks in other environments. For more information on this feature, see Networking between environments.

Custom DNS

Allows you to designate your own primary and secondary DNS servers. For more information, see Manually configuring domain name servers.

Apply NAT for connecting networks

Enables Network Address Translation to prevent IP address conflicts with connected networks. For more information, see Using Network Address Translation (NAT) to avoid IP address conflicts.

NAT Subnet

If Apply NAT for connecting networks is selected, the NAT Subnet box is auto-filled with a subnet that does not overlap with any other networks you have access to. The size of the subnet defines the size of the external IP address pool. For more complex network configurations, you can also manually enter a NAT subnet.

To avoid running out of NAT IP addresses, set the NAT subnet size so it is large enough to handle multiple NAT connections. We recommend a /22 subnet or larger. It is easier to set a large subnet during the initial network configuration than to extend the NAT subnet after NAT IP addresses have been assigned. The valid subnets are 16–29 (inclusive).