Digi Connect WAN Series User Manual page 124

Digi Connect WAN Family web interface
the frequency in which keep-alive messages are sent. You can use device—initiated Remote Manager
connections in any cellular network, whether using public or private IP addresses, or even if using NAT.
Note that your cellular/mobile provider may charge you, depending on your cellular/mobile service
plan, when the Remote Manager-registered device sends keep-alives messages.
A server-initiated Remote Manager connection works the opposite way. Remote Manager opens a TCP
connection, and the Remote Manager-registered device must be listening for the connection from
Remote Manager to occur. An advantage of server-initiated Remote Manager connections is that you
are not charged for sending the keep-alive bytes that are used in device-initiated connections. A
disadvantage is that there is no way of knowing whether the devices displayed in the Remote
Manager-registered device list are offline or connected. The device list shows all the devices as
disconnected until Remote Manager does something to interact with them. In addition, you cannot
use Remote Manager connections for devices that use private IP addresses and are behind a NAT.
(Server-initiated connections are not supported.)
A timed connection is another form of a device-initiated connection. For a timed connection, the
Remote Manager-registered device tries to connect to the Remote Manager Server at a configured,
regular interval (period). If a connection to an Remote Manager Server is already established, the
timed connection will not be attempted. The next attempt for a timed connection will occur at the
next scheduled interval.
A paged connection is another form of a device-initiated connection. An on-demand request, such as a
Short Message (SM) received via a cellular modem from a mobile service provider, initiates this type of
connection. The request message may specify the Remote Manager platform with which the Remote
Manager-registered device should connect, or it may simply request that the device connect to the
Remote Manager platform configured in the Paged Remote Manager Connection settings. Paged
Remote Manager Connections require both the global SMS configuration (Configuration > Mobile >
Short Message Service Settings > Enable cellular Short Message Service (SMS) capabilities to be
enabled, and the Configuration > Remote Manager > Short Messaging > Remote Manager SMS
Settings > Enable Remote Manager SMS settings, along with the current Phone Number and Service
ID settings.
Device IP address updates
Changes to the IP address for an Remote Manager-registered device present a challenge in Remote
Manager server-initiated connections, because Remote Manager needs to locate the Remote
Manager-registered device by its new IP address. Remote Manager devices handle address changes
by sending a device IP address update to Remote Manager. An IP address update permits Remote
Manager to connect to the Remote Manager-registered device, or to dynamically update a DNS with
the IP address of the Remote Manager-registered device.
Device-Initiated Remote Manager Connection settings
Enable Device-Initiated Remote Manager Connection: When enabled, the Remote Manager-
n
registered device initiates the connection to the Remote Manager.
Remote Manager Server Address: The IP address or hostname of the Remote Manager
n
platform.
Automatically reconnect to Remote Manager after being disconnected
n
Reconnect after: When enabled, the Remote Manager-registered device automatically
reconnects to Remote Manager after being disconnected and waiting for the specified amount
of time.
Digi Connect WAN Family User Guide
Configuration through the web interface
124