DNS down on Unify Segurity Gateway if WAN1 does not work

If you use Unify Security Gateway you could be surprised if DNS going down when WAN1 down.

To solve it you should setup different DNS servers and create static routes.

Interface Configuration:
WAN1 – DNS I used OpenDNS1 and Google DNS1
WAN2 – DNS I used OpenDNS2 and GoogleDNS2

Static routes:
WAN1-DNS1 – via interface WAN1
WAN1-DNS2 – via interface WAN1
WAN2-DNS1 – via interface WAN2

WAN2-DNS2 – via interface WAN2

Answer found here – https://community.ubnt.com/t5/UniFi-Routing-Switching/Problems-with-DNS-on-USG/td-p/2165706

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