Virtual Private Cloud OnDemand Networking Guide

Default Settings for Routed Networks
By default, Virtual Private Cloud OnDemand creates a routed network when you create a virtual data
center. Virtual Private Cloud OnDemand configures this auto-generated routed network with the following
properties:
n
Connects to the gateway through the public IP address
n
Has the default gateway IP address 192.168.12.1
n
Has the subnet mask 255.255.252.0
n
Has an IP address pool in the range192.168.12.100–192.168.12.200
n
Has the following networking services enabled or disabled by default:
n
Firewall: enabled; deny all traffic
n
DHCP: disabled
n
NAT: disabled
n
Static routing: disabled
n
VPN: disabled
n
Load balancing: disabled
When you add routed networks to a virtual data center, you must specify the default gateway IP address
and the IP address range for virtual machines attached to the network.
IMPORTANT When you initially add a routed network in Virtual Private Cloud OnDemand, virtual machines
added to that network will not be accessible through or able to connect to the Internet. By default, gateways
are deployed with firewall rules configured to deny all network traffic to and from the virtual machines on
the gateway networks. Also, NAT is disabled by default so that gateways are unable to translate the IP
addresses of the incoming and outgoing traffic. You must configure firewall and NAT rules on a gateway
for the virtual machines on its gateway network to be accessible. See “Add a Firewall Rule,” on page 29
and “Add a NAT Rule,” on page 23 for information.
Default Settings for Isolated Networks
An isolated network has an internal IP address and subnet. Virtual machines attached to an isolated
network communicate only with each other.
Most often, you connect your virtual machines to a routed network; however, you might connect virtual
machines to an isolated network as shown in the following examples:
n
To isolate your log servers or database server from direct Internet traffic
n
To run internal only applications or virtual machines such as applications under development
When you add an isolated network to a virtual data center, you must specify all network settings. DHCP is
disabled by default. (NAT, VPN, firewall rules, static routing, and DNS services are not applicable to
isolated networks.)
Summary of Default Settings for Gateways and Networks
The following table summarizes the default configuration for gateways and networks.
vCloud Air - Virtual Private Cloud OnDemand Networking Guide
10 VMware, Inc.