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How to force DHCP clients to use specific DNS adress like 8.8.8.8

ComputerCare

I want my DHCP clients to use a specific DNS address like 8.8.8.8, if some clients tries to change their DNS address they should not be able to surf the internet. Please help me to implement this rule on my SOPHOS XG Firewall router.

Thank You

Regards,

Govinda Thapa



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  • +1

    Hi Govinda,

     

    with regards to this setup,

    - you need to set XG in your hosts DNS settings. and set XG's DNS with 8.8.8.8 or whichever dns you prefer. and configure a firewall rule that will block any outbound dns query.

    - configure a firewall rule that will only accept dns traffic from LAN to WAN zone and 8.8.8.8 or any other preferred DNS as destination network.

     

    Let us know, how it goes.

     

    Regards,

    Rap 

  • 0 in reply to Ashen1

    As I am new to SOPHOS XG Firewall, I don't have much more knowledge about firewall rules. Would you mind with steps by steps on how to configure a firewall rule that will block any outbound DNS query and configure a firewall rule that will only accept DNS traffic from LAN to WAN zone and 8.8.8.8 or any other preferred DNS as destination network.

    Thank you

  • +1 in reply to ComputerCare

    Set the DNS Settings on the XG to 8.8.8.8

     

     

    And create the following rules:

     

    Kind Regards,

    Max

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