On Sat, Feb 28, 2009 at 04:32:47PM +1100, Ian Smith wrote:
> Recently we've had a Mac notebook of some sort on our LAN, that likes
> to make these DNS queries from time to time, to no avail, as noticed
> on a filtering bridge between the LAN and the router+DNS at
> 192.168.0.1:
> 
> 16:13:05.020397 192.168.0.59.53207 > 192.168.0.1.53:  63162+ PTR? 
> b._dns-sd._udp.0.0.168.192.in-addr.arpa. (57) [tos 0x18]
> 16:13:05.021093 192.168.0.1.53 > 192.168.0.59.53207:  63162 NXDomain* 0/1/0 
> (128) (DF)
> 16:13:05.215790 192.168.0.59.64633 > 192.168.0.1.53:  61059+ PTR? 
> db._dns-sd._udp.0.0.168.192.in-addr.arpa. (58) [tos 0x18]
> 16:13:05.216469 192.168.0.1.53 > 192.168.0.59.64633:  61059 NXDomain* 0/1/0 
> (129) (DF)
> 16:13:05.226242 192.168.0.59.61635 > 192.168.0.1.53:  6749+ PTR? 
> r._dns-sd._udp.0.0.168.192.in-addr.arpa. (57) [tos 0x18]
> 16:13:05.226789 192.168.0.1.53 > 192.168.0.59.61635:  6749 NXDomain* 0/1/0 
> (128) (DF)
> 16:13:05.237319 192.168.0.59.56300 > 192.168.0.1.53:  21450+ PTR? 
> dr._dns-sd._udp.0.0.168.192.in-addr.arpa. (58) [tos 0x18]
> 16:13:05.237842 192.168.0.1.53 > 192.168.0.59.56300:  21450 NXDomain* 0/1/0 
> (129) (DF)
> 16:13:05.248440 192.168.0.59.60806 > 192.168.0.1.53:  10032+ PTR? 
> lb._dns-sd._udp.0.0.168.192.in-addr.arpa. (58) [tos 0x18]
> 16:13:05.249252 192.168.0.1.53 > 192.168.0.59.60806:  10032 NXDomain* 0/1/0 
> (129) (DF)
> 
> What exactly are these hoping to discover, and what needs turning off
> in the Mac's setup (OSX, most likely a recent version) to quell them?

DNS-Based Service Discovery:
<http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>

Skip to the section titled: 

        12. Discovery of Browsing and Registration Domains (Domain
        Enumeration)'

when it gets boring.  There may be something more recent or more
authoritative, but that's what I have bookmarked.  

As for configuring the notebook, etc., perhaps someone else can chime
in.

-- 
George

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