Disable mDNS

Anonymous
2020-11-18T11:08:21.813+00:00

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 426.1K Reputation points MVP
    2020-11-18T14:43:48.083+00:00

    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.

    40902-image.png

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

3 additional answers

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  1. Anonymous
    2020-11-18T15:36:49.233+00:00

    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 426.1K Reputation points MVP
    2020-11-18T15:39:05.653+00:00

    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
    2021-12-04T20:59:56.643+00:00

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