Advanced Device Configuration > Address Configuration for Connected Devices > Configuring a Private Subnet

Configuring a Private Subnet
An administrator configures a private subnet by doing the following:
Defining a range of IP addresses which administrators can assign to devices that are connected to the OnBoard’s private ports
Designating one of the IP addresses within the specified range to be used by the OnBoard. The OnBoard-side address must be used by users when creating a IPSec VPN connection to enable native IP access.
The OnBoard uses the specified information to create a route to the private subnet.
The range of IP addresses is derived from the information shown in the following table, which the administrator supplies to define a private subnet:
Devices use this address when communicating with the OnBoard. The OnBoard uses this address when communicating with devices. This address must be within the private subnet’s IP address range.
The system derives the range of addresses that can be used for talking to devices by using the network portion of the OnBoard’s IP address and from the private subnet netmask that the administrator specified.
When configuring a device, the administrator assigns the private subnet to the device and assigns an IP address within the range specified for the private subnet. The OnBoard uses the device’s IP address when talking to a device, and devices use the OnBoard’s assigned address when talking the OnBoard.
When a private subnet is configured, the private subnet name is assigned to the priv0 interface in the form priv0:private_subnet-name along with the IP address assigned to the OnBoard in the form inet addr: OnBoardIPaddr. If multiple private subnets are configured, multiple priv0:private_subnet-name interfaces exist, each with its administratively-configured private subnet IP address for the OnBoard. See the following examples for sample ifconfig output:

Advanced Device Configuration > Address Configuration for Connected Devices > Configuring a Private Subnet