UniFi UXG devices support two different types of dual WAN configuration, with failover and distributed.
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Failover
Failover is when two or more WANs are in use, but they are in standby mode. Day to day the internet traffic will go over your primary WAN connection, but in the event of an internet outage, the EdgeRouter, UXG or another router will notice this and route traffic to the secondary WAN. Some routers have more than two WAN ports can do this with more.
To determine when the WAN is down or back up, devices will ping something on the Internet to check. For example, the UXG devices ping ping.ui.com to check connectivity.
Distributed
With distributed, two or more WAN connections are in use, but instead of one waiting the router will share traffic between them, this is generally used to get more bandwidth into the home or office. With UniFi, you can customise the percentage weight of each WAN, which can be based on available bandwidth.
HostiFi
HostiFi provides hosting for both Ubiquiti and TP-Link software-defined-networking (SDN) applications, with servers for UniFi, UISP and Omada. We also offer professional networking consulting, with HostiFi Pro.
If you run into any issues, send an email to support@hostifi.com or contact us via live chat.