192.168.1.1 is the address of your router. If you set that IP under alternate DNS in your network adapter it means your router will supply the DNS server, it will use your ISP’s DNS server unless you have something else set in your router. I suggest you set your DNS servers in your router, that way all your devices will use those DNS servers by default and you won’t have to set them up separately on each device you have connected to that router.

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