Teltonika RUT955 User Manual page 73

RUT955 User's Manual
7.2.2.4 Backup WAN configuration
Backup WAN is a function that allows you to back up your primary connection in case it goes down. There can be
two backup connections selected at one time. In that case, when the primary connection fails, the router tries to use the
backup with the higher priority and if this one is unavailable or fails too, then the router tries the backup with the 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
1. Health monitor interval
2. Health monitor ICMP host(s)
3. Health monitor ICMP timeout
4. Attempts before failover
5. Attempts before recovery
Teltonika Solutions
Possible values
Disable/5/10/20/30/60/120
Seconds
8.8.4.4 / Disable / DNS
Server(s) / WAN Gateway /
custom
1/2/3/4/5/10 Seconds
1/3/5/10/15/20
1/3/5/10/15/20
Explanation
The interval at which health checks are performed
Indicate where to send ping requests for a health
check. As there is no definitive way to determine
when the connection to internet is down for good,
it is best to define a host whose availability is that
of the internet as a whole (e.g., 8.8.8.8, 8.8.4.4)
The frequency at which ICMP requests are to be
sent. It is advised to set a higher value if your
connection has high latency or high jitter (latency
spikes)
The number of failed ping attempts after which
the connection is to be declared as "down"
The number of successful ping attempts after
which the connection is to be declared as "up"
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