Ian Smith wrote:

> Hi,
> 
> 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?
> 
[snip]

Probably Avahi and/or Apple's Bonjour service. These are also known as 
"ZeroConf" services.

-Mike



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