Configure Advanced Network settings Backup IP addresses
Digi TransPort WR Routers User Guide 524
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 address
becomes unavailable, the router tries the backup IP address. If that IP address is unavailable, the
router tries its backup IP address, and so on.
For example, if the original IP address is 192.168.0.1 with a backup IP address of 192.168.0.2,
setting the IP address in the next row to 192.168.0.2 with a backup IP address of 192.168.0.3
causes the router to try all these IP addresses in succession.
Note The time that it takes for a connection to an IP address to fail is determined by the Connect
timeout parameter on the Configuration > Network > Advanced Network Settings >
Socket Settings web page.
Related CLI commands
Entity Instance Parameter Values Equivalent web parameter
ipbu n IPaddr Valid IP address a.b.c.d IP Address a.b.c.d
ipbu n BUIPaddr Valid IP address a.b.c.d Backup IP Address a.b.c.d
ipbu n retrysec 0-2147483648 Retry Time s (seconds)
ipbu n donext off, on Try Next
sarsys 0 dest Valid IP address a.b.c.d Send Backup IP system messages to IP
address a.b.c.d
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