Digi WAN 3G User Manual page 132

A server-initiated connection works the opposite way. The remote management server opens a
TCP connection, and the Digi device must be listening for the connection to the remote
management server to occur. An advantage of server-initiated connections is that you are not
charged for sending the keep-alive bytes that are used in client-initiated connections. A
disadvantage is that there is no way of knowing whether the devices displayed in the device list at
the remote management server are offline or connected. The device list shows all the devices as
disconnected until the remote management server does something to interact with them. In
addition, server-initiated connections cannot be used if Digi devices have private IP addresses and
are behind a NAT.
Last Known Address (LKA)
Changes to the IP address for a Digi device present a challenge in server-initiated connections,
because the remote management server needs to locate the Digi device by its new IP address. Digi
Cellular Family devices handle address changes by sending a Last Known Address (LKA) update
to the remote management server. This permits the remote management server to connect back to
the Digi device, or to dynamically update a DNS with the IP address of the device.
Client initiated management connection settings
 Enable Remote Management and Configuration using a client initiated
connection: Configures the connection to the remote management server to be initiated
by the remote management client, that is, this Digi device.
Server Hostname: The IP address or hostname of the remote management server.

Automatically reconnect to the server after being disconnected

Wait for: Whether to automatically reconnect to the server after being disconnected and
waiting for the specified amount of time.
Server initiated management connection settings
Enable Remote Management and Configuration using a server initiated

connection: Configures th
initiated by the
remote management
Enable Last Known Address (LKA) updates to the following server: Enables or

disables a connection to a remote management server to inform that server of the IP
address of the Digi device, known as a "last known address" (LKA) update. This
permits the remote management server to connect back to the Digi Cellular Family
device, or to dynamically update a DNS with the IP address of the device.
Server Hostname: The IP address or hostname of the remote management server.

Retry if the LKA update fails:

Retry every: These options specify whether another "last known address" update
attempt should be made after a previous attempt failed, and how often the retry attempts
should occur.
e connection to the
remote management
server.
C o n f i g u r e D i g i d e v i c e s
server to be
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