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As you can see, the configuration is very similar to the static protocol; only in the example a 99th subnet is
defined. Now if some device has an IP in the 99 subnet (192.168.99.xxx) and the subnets gateway metric is “higher” and
the device is trying to reach the internet it will reroute it’s traffic not to the gateway that is defined in common
configurations but through the one that is specified in IP aliases.
You may also optionally define a broadcast address and a custom DNS server.
7.2.2.2.5
Backup WAN configuration
Backup WAN is function that allows you to back up your primary connection in case it goes down. There can be
two backup connections selected at the same time, in that case, when primary connection fails, router tries to use
backup with higher priority and if that is unavailable or fails too, then router tries the backup with lower priority.
The majority of the options consist of timing and other important parameters that help determine the health of
your primary connection. Regular health checks are constantly performed in the form of ICMP packets (Pings) on your
primary connection. When the connections state starts to change (READY->NOT READY and vice versa) a necessary
amount of failed or passed health checks has to be reached before the state changes completely. This delay is instituted
so as to mitigate “spikes” in connection availability, but it also extends the time before the backup link can be brought
up or down.
Field Name
Sample value
Explanation
