[Samba] Multicast DNS required?

Ryan Ashley ryana at reachtechfp.com
Tue Sep 23 17:22:01 MDT 2014

Bear in mind, it isn't just Apple products. HP and other printer 
manufacturers are using ".local" for their wireless printers now also. 
Generally speaking, these won't be in a corporate environment due to 
nice big machines like a Xerox Fiery, but if they do make their way into 
the environment, they can cause trouble also. Good luck!

On 09/23/2014 07:01 PM, James wrote:
> Ryan,
>     Thanks for the explanation and link. Will follow up and review. 
> Looks like I may have trouble up ahead seeing as the powers that be 
> want to introduce apple products into the domain.
> On 9/23/2014 6:40 PM, Ryan Ashley wrote:
>> mDNS is also called Bonjour on Apple systems (or Windows system with 
>> iTunes and such installed). This is used for something unrelated to 
>> actual DNS. In Linux we have "avahi" that does the same thing. 
>> However, a domain ending in ".local" can have issues due to zeroconf 
>> things (printers, wireless TV's, etc) use that domain. In other 
>> words, never, ever end a domain name in ".local". I use ".lan" for my 
>> domains. The issue is common on older domains that have been upgraded 
>> dozens of times. Even I had issues with it for a while. I do not 
>> believe Samba needs mDNS/zeroconf support though.
>> You can read more on the matter at the link below. One of my clients 
>> (I picked them up a few years ago) had a domain ending in ".local" 
>> and they had begun using Apple devices (phones, iPads) and had all 
>> kinds of issues due to the ".local" domain being used by them. Long 
>> story short, I got lucky when their DC died and I got to do a new 
>> domain. Now everything is as smooth as butter!
>> http://en.wikipedia.org/wiki/.local
>> On 09/23/2014 03:34 PM, James wrote:
>>> Hello,
>>>     I noticed all my DC's have port 5353 closed. I'm using the 
>>> internal DNS and wasn't sure if multicast DNS must be enabled? I do 
>>> not appear to be having any DNS issues. My only concern is with the 
>>> wiki on Multicast DNS.
>>> "By default, mDNS only and exclusively resolves host names ending 
>>> with the |.local| top-level domain (TLD). This can cause problems if 
>>> that domain includes hosts that do not implement mDNS but can be 
>>> found via a conventional unicast DNS server. Resolving such 
>>> conflicts requires network configuration changes that violate the 
>>> zero configuration 
>>> <http://en.wikipedia.org/wiki/Zero_configuration_networking> goal."
>>> Given my domain is 'domain.local'. I wasn't sure if I should find 
>>> out why the port is closed.  Thanks.

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