just hit this today
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Re: Multi WAN Failover - DNS Queries and Open States Causing Traffic to Failover WAN
Sorry for bumping an old thread but I just came upon this today, no idea why this DNS traffic was going over my tier 2 failover wan link as it is an LTE AP and I get billed for data, so nothing should be going out on this WAN link. Setting the floating rule did help to reduce the traffic to almost negligible. Still very weird.
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