Multicast DNS Explained

In this video I discuss multicast DNS. Wikipedia defines multicast dns In computer networking, the multicast DNS (mDNS) protocol resolves hostnames to IP addresses within small networks that do not include a local name server. 

0:00 Intro
0:30 DNS Explained in LAN
4:00 Multicast DNS

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source by Hussein Nasser

linux dns configuration

Devin BARTON

I am an avid Linux lover and open source enthusiast. I use Ubuntu and believe in sharing knowledge. Apart from Linux, I love classic detective mysteries.

17 thoughts on “Multicast DNS Explained

  • May 7, 2021 at 9:55 am
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    probably somebody know ?
    Why I don't have access to my Local NAS mynas.locl over VPN ?
    Only with ip address it working fine.

    Reply
  • May 7, 2021 at 9:55 am
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    Thank you sir. Been doing IT for a bit but never formally trained. You're helping me fill in the gaps.

    Reply
  • May 7, 2021 at 9:55 am
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    Thanks for the vid! This was just the explanation I needed after trying to wrap my head around it for hours 😅

    Reply
  • May 7, 2021 at 9:55 am
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    Sooo ARP is for find the mac adress from ip adress and it is local, and mDNS is for find the ip adress from a name ?

    Reply
  • May 7, 2021 at 9:55 am
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    Here's is my 2 cents. Listening to UDP 5353 is part of the mDNS protocol stack, which has been packed with main stream Linux, OSX, Android, Windows 10, and probably iOS.

    Reply
  • May 7, 2021 at 9:55 am
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    Great exposition Nasser! It was usefull for my job about this protocol in my Spanish's University. Thanks a lot!

    Reply
  • May 7, 2021 at 9:55 am
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    mDNS is very useful when you are using VLANs and have IoT devices like chromecast in different VLAN

    Reply
  • May 7, 2021 at 9:55 am
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    Great job! I have to implement this thing soon and that was the most comprehensible explanation that I found on the web.

    Reply
  • May 7, 2021 at 9:55 am
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    Hey there, Hussein! i recently work around webrtc technology can you make video on how actually stun and turn server working behind of the seen. Thank you and i really love the way u explain things.

    Reply
  • May 7, 2021 at 9:55 am
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    Hey there, Hussein! On the topic of DNS servers, can you do a video on writing a very rudimentary DNS server from scratch? Given that Node.js provides the `dgram` module ( https://nodejs.org/api/dgram.html ), I figured that it would perhaps be possible to locally set up a Node-powered DNS server in your Raspberry Pi. After that, it would just be a matter of setting up the DNS settings on a specific device or on the network router itself.
    I think it would be a really great video to illustrate the essence of DNS queries. If possible, it can also shed light on what it means to have "DNS-over-HTTPS".

    Reply
  • May 7, 2021 at 9:55 am
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    DNS port is 53 not 5353. And multicast is a huge thing to discuss in so short span of time.

    Reply

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