Hey all, during the last couple weeks our security center on the Meraki Dashboard has been blowing up with suspicious .null DNS queries, all going to our Polycom phones. I'm talking upwards of 14,000 hits a day. Upon further research, all the traffic seems to be coming from San Francisco, home of the Cisco Umbrella DNS that Meraki recently integrated with their systems. There doesn't seem to be any noticeable drop in QoS, but does anybody know the solution for stopping all the .null queries if we don't plan on incorporating Umbrella?
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