Revision: 1.00
Copyright 2015 U.S. Robotics Corporation
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P a g e
Troubleshooting
How does connection priority work in conjunction with connection persistence?
What is the priority order between port forwarding rules, DMZ and remote login in the internal routing
table?
How does the automatic upgrade feature work on the USR Universe?
Why does the page display incorrectly?
How does connection priority work in conjunction with connection persistence?
First of all it is crucial to understand both features run as separate services on the Gateway although
their output is heavily linked.
In essence the
connection priority
feature is responsible for making sure the Gateway is
connected
to
the best available communications link.
Connection Persistence
however is ensuring that the
service
required for proper operation is reachable.
The Gateway will first attempt to connect to the highest priority network selected in the connection
priority table. In case after 15 seconds this does not yield a connected state the next interface will be
started to try and connect in parallel to the primary interface. If after an additional 15 seconds, none of
the previously started interfaces are in connected state the next interface in line will be started. It is
important to understand the Gateway will keep checking higher priority interfaces for their connection
status.
When the connection persistence feature is enable the Gateway will in addition to checking for a
connected state, monitor the result of connection persistence on the current and higher priority
interfaces. In case a higher priority interface is connected but the connection persistence service has
detected the required service is unreachable the interface next in line will be started and checked for
connectivity in parallel.
Example:
Connection priority is configured in following order: 1. Ethernet; 2. WLAN; 3.
3Ginterface. At startup the gateway will check is the Ethernet is connected, if not the WLAN
interface will be started; at that point the gateway will check both WLAN and Ethernet. When
WLAN is in a connected state the gateway will keep checking the Ethernet interface in the
background and will switch back to the Ethernet interface incase the state is changed to
connected.
