Configuring advanced network settings Configure advanced network settings
Digi TransPort® Routers User Guide
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IP Address a.b.c.d
The original IP address to which the back-up address relates.
Backup IP address a.b.c.d
The backup address to try when the router fails to open a connection to the previous IP
address.
Retry Time s (seconds)
The length of time, in seconds, the router waits between checks to see if a connection can be
made to IP Address.
Try Next
When connection to the primary IP address has just failed, this text box determines whether a
connection to the backup IP address should be attempted immediately or when the application
next attempts to open a connection. When checked, the socket attempts to connect to the
backup IP address immediately after the connection to the primary IP address failed and
before reporting this failure to the calling application, such as TPAD. If the backup is successful,
the application will not experience any kind of failure, even though the router has connected to
the backup IP address. When unchecked, the socket reports the failure to connect back to the
calling application immediately after the connection to the primary IP address has failed. The
router does not try to connect to the backup IP address at this stage. The next time that the
application attempts to connect to the same IP address, the router instead automatically
connects to the backup IP address. Use the Add and Delete buttons to add and delete entries
to and from the table.
Add button
Adds the backup IP address settings to the network configuration.
Send “Backup IP” system messages to IP Address: a.b.c.d
The destination IP address to which system messages notifying of the unavailability of an IP
address should be sent. This allows the router to send UDP messages to other routers to notify
them that an IP address has become available/unavailable. Devices that receive the IP address
available/unavailable messages search their own backup IP address tables for the IP
addresses indicated, and tag those addresses as available/unavailable as appropriate.
Chaining backup IP addresses
It is possible to chain backup IP addresses by making multiple entries in the table.
For example, if the backup IP address for the original IP address appears as the IP address in
the next row, along with a new backup IP address for that IP address. When the original IP
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