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LOTS OF DNS REQUEST via DHCP server

Hi guyes, I have a Dhcp server(192.168.1.215) but if i see my logs there are number of request which are generating by my DHCP for a public DNS on port 53 (192.175.48.6 & 192.175.48.42 & 192.175.48.1)  and also i blocked my internet on my Dhcp server 

 

PLease help



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