Disable mDNS


Hi, I understnad that mDNS works in small networks when there is no DNS servers which is not the case in my networks. I have a win AD with DNS. Recently, while I was in a wirshark session, I noticed recently, that different devices in my network flooding the network with mDNS messages every 60 seconds or less as you can notice in the snapshot. I have the service Dnscache/DNS client always running but no registry key. So 1st question, if it is a cache service, why devices are sending this? 2nd q, how can I disable it as I have a DNS server? ![40714-mdns.jpg][1] [1]: /api/attachments/40714-mdns.jpg?platform=QnA

Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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Accepted answer
  1. Dave Patrick 426.2K Reputation points MVP

    You could set this one to Enabled
    If you enable this policy setting, LLMNR will be disabled on all available network adapters on the client computer.


    --please don't forget to Accept as answer if the reply is helpful--

3 additional answers

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  1. Anonymous

    Ok, yes enabling this key is preventing now this multicast. But still wondering, why I am having this since last week? Is it something related to a recent update by microsoft?

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  2. Dave Patrick 426.2K Reputation points MVP

    Glad to hear it helps.

    Is it something related to a recent update by microsoft?

    not that I'm aware of.

  3. Andreas Finstad 81 Reputation points

    Have a look here: https://f20.be/blog/mdns